From 47d52268958e8a93b7e5ccfc22f83c82e13e1f6f Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Wed, 2 Mar 2016 14:30:44 -0600
Subject: [PATCH 01/12] drm: i915: remove intel_hdmi variable declaration

'intel_hdmi' variable is redeclared, use same variable declared in
function scope.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 616108c..3b362ddb 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1413,7 +1413,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 	intel_hdmi_unset_edid(connector);

 	if (intel_hdmi_set_edid(connector, live_status)) {
-		struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+		intel_hdmi = intel_attached_hdmi(connector);

 		hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
 		status = connector_status_connected;

From 146a6648f67ce715e90bbd122c509aa26247a8e4 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Tue, 1 Mar 2016 16:25:04 -0600
Subject: [PATCH 02/12] drm/i915: Add headers for non-HDAudio HDMI interface

Add header files for interface available on Baytrail and CherryTrail

Initial code was downloaded from https://github.com/01org/baytrailaudio/
...and had the changes to .config stripped and the revert on sound/init.c
done by David Henningson

Clean-up, port to 4.5 and intel-drm by Pierre Bossart
CherryTrail support by Jerome Anand

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 drivers/gpu/drm/i915/hdmi_audio_if.h | 125 +++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h      |  31 +++++++++
 drivers/gpu/drm/i915/i915_reg.h      |  22 ++++++
 drivers/gpu/drm/i915/intel_drv.h     |  13 ++++
 4 files changed, 191 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/hdmi_audio_if.h

diff --git a/drivers/gpu/drm/i915/hdmi_audio_if.h b/drivers/gpu/drm/i915/hdmi_audio_if.h
new file mode 100644
index 0000000..165bba5
--- /dev/null
+++ b/drivers/gpu/drm/i915/hdmi_audio_if.h
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2010, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * Authors:
+ *	jim liu <jim.liu@intel.com>
+ *	Uma Shankar <uma.shankar@intel.com>
+ */
+
+
+#ifndef __HDMI_AUDIO_IF_H
+#define __HDMI_AUDIO_IF_H
+
+#include <linux/types.h>
+#include <drm/drmP.h>
+
+/* HDMI AUDIO INTERRUPT TYPE */
+#define HDMI_AUDIO_UNDERRUN     (1UL<<0)
+#define HDMI_AUDIO_BUFFER_DONE  (1UL<<1)
+
+/* the monitor type HDMI or DVI */
+#define MONITOR_TYPE_HDMI 1
+#define MONITOR_TYPE_DVI  2
+
+extern int i915_hdmi_state;
+
+enum had_caps_list {
+	HAD_GET_ELD = 1,
+	HAD_GET_SAMPLING_FREQ,
+	HAD_GET_DISPLAY_RATE,
+	HAD_GET_HDCP_STATUS,
+	HAD_GET_AUDIO_STATUS,
+	HAD_SET_ENABLE_AUDIO,
+	HAD_SET_DISABLE_AUDIO,
+	HAD_SET_ENABLE_AUDIO_INT,
+	HAD_SET_DISABLE_AUDIO_INT,
+	OTHERS_TBD,
+};
+
+enum had_event_type {
+	HAD_EVENT_HOT_PLUG = 1,
+	HAD_EVENT_HOT_UNPLUG,
+	HAD_EVENT_MODE_CHANGING,
+	HAD_EVENT_PM_CHANGING,
+	HAD_EVENT_AUDIO_BUFFER_DONE,
+	HAD_EVENT_AUDIO_BUFFER_UNDERRUN,
+	HAD_EVENT_QUERY_IS_AUDIO_BUSY,
+	HAD_EVENT_QUERY_IS_AUDIO_SUSPENDED,
+};
+
+/*
+ * HDMI Display Controller Audio Interface
+ *
+ */
+typedef int (*had_event_call_back) (enum had_event_type event_type,
+		void *ctxt_info);
+
+struct hdmi_audio_registers_ops {
+	int (*hdmi_audio_get_register_base)(uint32_t *reg_base);
+	int (*hdmi_audio_read_register)(uint32_t reg_addr, uint32_t *data);
+	int (*hdmi_audio_write_register)(uint32_t reg_addr, uint32_t data);
+	int (*hdmi_audio_read_modify)(uint32_t reg_addr, uint32_t data,
+			uint32_t mask);
+};
+
+struct hdmi_audio_query_set_ops {
+	int (*hdmi_audio_get_caps)(enum had_caps_list query_element,
+			void *capabilties);
+	int (*hdmi_audio_set_caps)(enum had_caps_list set_element,
+			void *capabilties);
+};
+
+typedef struct hdmi_audio_event {
+	int type;
+} hdmi_audio_event_t;
+
+struct snd_intel_had_interface {
+	const char *name;
+	int (*query)(void *had_data, hdmi_audio_event_t event);
+	int (*suspend)(void *had_data, hdmi_audio_event_t event);
+	int (*resume)(void *had_data);
+};
+
+struct hdmi_audio_priv {
+	struct drm_device *dev;
+	u32 hdmi_reg;
+	u32 hdmi_lpe_audio_reg;
+	bool is_hdcp_supported;
+	bool hdmi_hpd_connected;
+	int monitor_type;
+	void *context;
+	int pipe;
+};
+
+extern void i915_hdmi_audio_init(struct hdmi_audio_priv *p_hdmi_priv);
+
+extern bool mid_hdmi_audio_is_busy(struct drm_device *dev);
+extern bool mid_hdmi_audio_suspend(struct drm_device *dev);
+extern void mid_hdmi_audio_resume(struct drm_device *dev);
+extern void mid_hdmi_audio_signal_event(struct drm_device *dev,
+		enum had_event_type event);
+
+/* Added for HDMI Audio */
+extern void hdmi_get_eld(uint8_t *eld);
+extern struct hdmi_audio_priv *get_hdmi_priv(void);
+extern void hdmi_get_eld(uint8_t *eld);
+extern int i915_enable_hdmi_audio_int(struct drm_device *dev);
+extern int i915_disable_hdmi_audio_int(struct drm_device *dev);
+extern int mid_hdmi_audio_setup(
+	had_event_call_back audio_callbacks,
+	struct hdmi_audio_registers_ops *reg_ops,
+	struct hdmi_audio_query_set_ops *query_ops);
+extern int mid_hdmi_audio_register(
+	struct snd_intel_had_interface *driver,
+	void *had_data);
+
+#endif /* __HDMI_AUDIO_IF_H */
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b0847b9..b700adc 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -52,6 +52,7 @@
 #include <linux/kref.h>
 #include <linux/pm_qos.h>
 #include "intel_guc.h"
+#include "hdmi_audio_if.h"

 /* General customization:
  */
@@ -1153,6 +1154,18 @@ struct intel_gen6_power_mgmt {
 	struct mutex hw_lock;
 };

+/* Runtime power management related */
+struct intel_gen7_rpm {
+	/* To track (num of get calls - num of put calls)
+	 * made by procfs
+	 */
+	atomic_t procfs_count;
+	/* To make sure ring get/put are in pair */
+	bool ring_active;
+	struct proc_dir_entry *i915_proc_dir;
+	struct proc_dir_entry *i915_proc_file;
+};
+
 /* defined intel_pm.c */
 extern spinlock_t mchdev_lock;

@@ -1953,6 +1966,19 @@ struct drm_i915_private {

 	struct intel_encoder *dig_port_map[I915_MAX_PORTS];

+	/* Added for HDMI Audio */
+	had_event_call_back had_event_callbacks;
+	struct snd_intel_had_interface *had_interface;
+	void *had_pvt_data;
+	int tmds_clock_speed;
+	int hdmi_audio_interrupt_mask;
+	struct work_struct hdmi_audio_wq;
+
+	u32 hotplug_status;
+
+	/* Runtime power management related */
+	struct intel_gen7_rpm rpm;
+
 	/*
 	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
 	 * will be rejected. Instead look for a better place.
@@ -3509,6 +3535,11 @@ int intel_freq_opcode(struct drm_i915_private *dev_priv, int val);
 	} while (upper != old_upper && loop++ < 2);			\
 	(u64)upper << 32 | lower; })

+int i915_rpm_get_disp(struct drm_device *dev);
+int i915_rpm_put_disp(struct drm_device *dev);
+
+bool i915_is_device_active(struct drm_device *dev);
+
 #define POSTING_READ(reg)	(void)I915_READ_NOTRACE(reg)
 #define POSTING_READ16(reg)	(void)I915_READ16_NOTRACE(reg)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4897728..713a0173 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2053,7 +2053,25 @@ enum skl_disp_power_wells {
 #define I915_WINVALID_INTERRUPT				(1<<1)
 #define I915_USER_INTERRUPT				(1<<1)
 #define I915_ASLE_INTERRUPT				(1<<0)
+#define I915_LPE_AUDIO_HDMI_STATUS_A	_MMIO(dev_priv->info.display_mmio_offset + 0x65064)
+#define I915_LPE_AUDIO_HDMI_STATUS_B	_MMIO(dev_priv->info.display_mmio_offset + 0x65864)
+#define I915_LPE_AUDIO_HDMI_STATUS_C	_MMIO(dev_priv->info.display_mmio_offset + 0x65964)
+#define I915_HDMI_AUDIO_UNDERRUN			(1UL<<31)
+#define I915_HDMI_AUDIO_BUFFER_DONE			(1UL<<29)
 #define I915_BSD_USER_INTERRUPT				(1<<25)
+#define I915_HDMI_AUDIO_UNDERRUN_ENABLE			(1UL<<15)
+
+#define I915_HDMI_AUDIO_LPE_C_CONFIG			0x65900
+#define I915_HDMI_AUDIO_LPE_B_CONFIG			0x65800
+#define I915_HDMI_AUDIO_LPE_A_CONFIG			0x65000
+
+#define HDMI_LPE_AUDIO_PIPE_OFFSET			0x100
+#define HDMI_LPE_AUDIO_PIPE_BC_OFFSET(pipe) \
+	(I915_LPE_AUDIO_HDMI_STATUS_B + \
+	(pipe - 1) * HDMI_LPE_AUDIO_PIPE_OFFSET)
+#define I915_LPE_AUDIO_HDMI_STATUS(pipe) \
+	(pipe ? (HDMI_LPE_AUDIO_PIPE_BC_OFFSET(pipe)) : \
+	I915_LPE_AUDIO_HDMI_STATUS_A)

 #define GEN6_BSD_RNCID			_MMIO(0x12198)

@@ -3355,6 +3373,9 @@ enum skl_disp_power_wells {
 #define _GEN3_SDVOC	0x61160
 #define GEN3_SDVOB	_MMIO(_GEN3_SDVOB)
 #define GEN3_SDVOC	_MMIO(_GEN3_SDVOC)
+#define HDMIB	(dev_priv->info.display_mmio_offset + 0x61140)
+#define HDMIC	(dev_priv->info.display_mmio_offset + 0x61160)
+#define HDMID	(dev_priv->info.display_mmio_offset + 0x6116C)
 #define GEN4_HDMIB	GEN3_SDVOB
 #define GEN4_HDMIC	GEN3_SDVOC
 #define VLV_HDMIB	_MMIO(VLV_DISPLAY_BASE + 0x61140)
@@ -3364,6 +3385,7 @@ enum skl_disp_power_wells {
 #define PCH_HDMIB	PCH_SDVOB
 #define PCH_HDMIC	_MMIO(0xe1150)
 #define PCH_HDMID	_MMIO(0xe1160)
+#define PORT_ENABLE	(1 << 31)

 #define PORT_DFT_I9XX				_MMIO(0x61150)
 #define   DC_BALANCE_RESET			(1 << 25)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index df7f3cb..12cd13e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -695,6 +695,14 @@ struct cxsr_latency {
 #define to_intel_plane_state(x) container_of(x, struct intel_plane_state, base)
 #define intel_fb_obj(x) (x ? to_intel_framebuffer(x)->obj : NULL)

+/* HDMI bits are shared with the DP bits */
+#define   HDMIB_HOTPLUG_LIVE_STATUS             (1 << 29)
+#define   HDMIC_HOTPLUG_LIVE_STATUS             (1 << 28)
+#define   HDMID_HOTPLUG_LIVE_STATUS             (1 << 27)
+#define   HDMI_LIVE_STATUS_BASE			30
+#define   HDMI_LIVE_STATUS_DELAY_STEP		10
+#define   HDMI_EDID_RETRY_COUNT			3
+
 struct intel_hdmi {
 	i915_reg_t hdmi_reg;
 	int ddc_bus;
@@ -706,6 +714,9 @@ struct intel_hdmi {
 	bool rgb_quant_range_selectable;
 	enum hdmi_picture_aspect aspect_ratio;
 	struct intel_connector *attached_connector;
+	struct edid *edid;
+	uint32_t edid_mode_count;
+
 	void (*write_infoframe)(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
 				const void *frame, ssize_t len);
@@ -1138,6 +1149,8 @@ intel_rotation_90_or_270(unsigned int rotation)

 void intel_create_rotation_property(struct drm_device *dev,
 					struct intel_plane *plane);
+void chv_set_lpe_audio_reg_pipe(struct drm_device *dev,
+				int encoder_type, enum port port);

 /* shared dpll functions */
 struct intel_shared_dpll *intel_crtc_to_shared_dpll(struct intel_crtc *crtc);

From 1cab896a5981554dc754f6279a675a67fc9adf16 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Tue, 1 Mar 2016 16:25:04 -0600
Subject: [PATCH 03/12] drm/i915: changes for non-HDAudio HDMI interface

Changes to existing code for interface available on Baytrail and
CherryTrail

This driver was downloaded from https://github.com/01org/baytrailaudio/

...and had the changes to .config stripped and the revert on sound/init.c

Also squashed change from Toyo Abe to fix typos and underrun issues
To enable interrupt, IER, IIR, and IMR must be configured appropriately.
IER setting for hdmi_audio was missing.
This fixes the following warning in dmesg.
[  302.369965] had: Driver detected 2 missed buffer done interrupt(s)!!!!

Cleanup, correction for PIPE_A/PIPE_B inversions,
port to 4.5 and intel-drm by Pierre Bossart
CherryTrail support by Jerome Anand

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Toyo Abe <toyo.abe@gmail.com>
---
 drivers/gpu/drm/i915/i915_irq.c      | 151 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_display.c |  86 ++++++++++++++
 drivers/gpu/drm/i915/intel_hdmi.c    | 211 ++++++++++++++++++++++++++++++++++-
 3 files changed, 446 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index fa8afa7..59f4eaa 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -603,6 +603,42 @@ i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
 	__i915_disable_pipestat(dev_priv, pipe, enable_mask, status_mask);
 }

+/* Added for HDMI AUDIO */
+void
+i915_enable_lpe_pipestat(struct drm_i915_private *dev_priv, int pipe)
+{
+	u32 mask;
+
+	mask = dev_priv->hdmi_audio_interrupt_mask;
+	mask |= I915_HDMI_AUDIO_UNDERRUN | I915_HDMI_AUDIO_BUFFER_DONE;
+	/* Enable the interrupt, clear any pending status */
+	if (IS_CHERRYVIEW(dev_priv->dev)) {
+		I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_C, mask);
+		POSTING_READ(I915_LPE_AUDIO_HDMI_STATUS_C);
+	} else {
+		I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_A, mask);
+		POSTING_READ(I915_LPE_AUDIO_HDMI_STATUS_A);
+	}
+}
+
+void
+i915_disable_lpe_pipestat(struct drm_i915_private *dev_priv, int pipe)
+{
+	u32 mask;
+
+	mask = dev_priv->hdmi_audio_interrupt_mask;
+	mask |= I915_HDMI_AUDIO_UNDERRUN | I915_HDMI_AUDIO_BUFFER_DONE;
+	/* Disable the interrupt, clear any pending status */
+	if (IS_CHERRYVIEW(dev_priv->dev)) {
+		I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_C, mask);
+		POSTING_READ(I915_LPE_AUDIO_HDMI_STATUS_C);
+
+	} else {
+		I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_A, mask);
+		POSTING_READ(I915_LPE_AUDIO_HDMI_STATUS_A);
+	}
+}
+
 /**
  * i915_enable_asle_pipestat - enable ASLE pipestat for OpRegion
  * @dev: drm device
@@ -1644,6 +1680,24 @@ static bool intel_pipe_handle_vblank(struct drm_device *dev, enum pipe pipe)
 	return true;
 }

+static inline
+void i915_notify_audio_buffer_status(struct drm_device *dev, const i915_reg_t reg)
+{
+	u32 lpe_stream = 0;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	lpe_stream = I915_READ(reg);
+	if (lpe_stream & I915_HDMI_AUDIO_UNDERRUN) {
+		I915_WRITE(reg, I915_HDMI_AUDIO_UNDERRUN);
+		mid_hdmi_audio_signal_event(dev,
+			HAD_EVENT_AUDIO_BUFFER_UNDERRUN);
+	}
+	if (lpe_stream & I915_HDMI_AUDIO_BUFFER_DONE) {
+		I915_WRITE(reg, I915_HDMI_AUDIO_BUFFER_DONE);
+		mid_hdmi_audio_signal_event(dev,
+			HAD_EVENT_AUDIO_BUFFER_DONE);
+	}
+}
+
 static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1713,6 +1767,23 @@ static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir)
 			intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
 	}

+	if (IS_CHERRYVIEW(dev)) {
+		// FIXME: plb: why are pipes and status mapped this way?
+		if (iir & I915_LPE_PIPE_C_INTERRUPT)
+			i915_notify_audio_buffer_status(dev,
+						I915_LPE_AUDIO_HDMI_STATUS_C);
+		if (iir & I915_LPE_PIPE_B_INTERRUPT)
+			i915_notify_audio_buffer_status(dev,
+						I915_LPE_AUDIO_HDMI_STATUS_B);
+		if (iir & I915_LPE_PIPE_A_INTERRUPT)
+			i915_notify_audio_buffer_status(dev,
+						I915_LPE_AUDIO_HDMI_STATUS_A);
+	} else {
+		if (iir & I915_LPE_PIPE_B_INTERRUPT)
+			i915_notify_audio_buffer_status(dev,
+						I915_LPE_AUDIO_HDMI_STATUS_A);
+	}
+
 	if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
 		gmbus_irq_handler(dev);
 }
@@ -2790,6 +2861,72 @@ static void gen8_disable_vblank(struct drm_device *dev, unsigned int pipe)
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 }

+/* Added for HDMI Audio */
+int i915_enable_hdmi_audio_int(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
+	unsigned long irqflags;
+	u32 imr, int_bit;
+	int pipe = 1;
+
+	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+	i915_enable_lpe_pipestat(dev_priv, pipe);
+
+	imr = I915_READ(VLV_IMR);
+
+	if (IS_CHERRYVIEW(dev_priv->dev)) {
+		// FIXME: plb: looks wrong
+
+		//imr &= ~I915_LPE_PIPE_C_INTERRUPT;
+		int_bit = (pipe ? (I915_LPE_PIPE_B_INTERRUPT >>
+					((pipe - 1) * 9)) :
+					I915_LPE_PIPE_A_INTERRUPT);
+		imr &= ~int_bit;
+	} else {
+		/* Audio is on Stream A but uses HDMI PIPE B */
+		imr &= ~I915_LPE_PIPE_B_INTERRUPT;
+	}
+
+	I915_WRITE(VLV_IMR, imr);
+	I915_WRITE(VLV_IER, ~imr);
+	POSTING_READ(VLV_IER);
+	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+	return 0;
+}
+
+/* Added for HDMI Audio */
+int i915_disable_hdmi_audio_int(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
+	unsigned long irqflags;
+	u32 imr, int_bit;
+	int pipe = 1;
+
+	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+	imr = I915_READ(VLV_IMR);
+
+	if (IS_CHERRYVIEW(dev_priv->dev)) {
+		// FIXME: plb: looks wrong, should have other interrupts as well?
+		//imr |= I915_LPE_PIPE_C_INTERRUPT;
+		int_bit = (pipe ? (I915_LPE_PIPE_B_INTERRUPT >>
+					((pipe - 1) * 9)) :
+					I915_LPE_PIPE_A_INTERRUPT);
+		imr |= int_bit;
+	}
+	else
+		imr |= I915_LPE_PIPE_B_INTERRUPT;
+
+	I915_WRITE(VLV_IER, ~imr);
+	I915_WRITE(VLV_IMR, imr);
+	POSTING_READ(VLV_IMR);
+
+	i915_disable_lpe_pipestat(dev_priv, pipe);
+	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+	return 0;
+}
+
 static bool
 ring_idle(struct intel_engine_cs *ring, u32 seqno)
 {
@@ -3539,6 +3676,7 @@ static void valleyview_display_irqs_install(struct drm_i915_private *dev_priv)
 	u32 pipestat_mask;
 	u32 iir_mask;
 	enum pipe pipe;
+	u32 lpe_status_clear;

 	pipestat_mask = PIPESTAT_INT_STATUS_MASK |
 			PIPE_FIFO_UNDERRUN_STATUS;
@@ -3559,12 +3697,25 @@ static void valleyview_display_irqs_install(struct drm_i915_private *dev_priv)
 		   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
 	if (IS_CHERRYVIEW(dev_priv))
 		iir_mask |= I915_DISPLAY_PIPE_C_EVENT_INTERRUPT;
+
+	if (IS_CHERRYVIEW(dev_priv->dev))
+		// FIXME: plb: looks wrong: what about other interrupts
+		iir_mask |= I915_LPE_PIPE_C_INTERRUPT;
+
 	dev_priv->irq_mask &= ~iir_mask;

 	I915_WRITE(VLV_IIR, iir_mask);
 	I915_WRITE(VLV_IIR, iir_mask);
 	I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
 	I915_WRITE(VLV_IMR, dev_priv->irq_mask);
+
+	lpe_status_clear = I915_HDMI_AUDIO_UNDERRUN |
+			I915_HDMI_AUDIO_BUFFER_DONE;
+	I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_A, lpe_status_clear);
+	I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_B, lpe_status_clear);
+	if (IS_CHERRYVIEW(dev_priv->dev))
+		I915_WRITE(I915_LPE_AUDIO_HDMI_STATUS_C, lpe_status_clear);
+
 	POSTING_READ(VLV_IMR);
 }

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 46947ff..ca212bb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8010,6 +8010,16 @@ static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
 				  num_connectors);
 	}

+	/* Added for HDMI Audio */
+	if ((IS_CHERRYVIEW(dev)) || (IS_VALLEYVIEW(dev))) {
+		if(intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI)) {
+			dev_priv->tmds_clock_speed = crtc_state->port_clock;
+
+			mid_hdmi_audio_signal_event(dev_priv->dev,
+				HAD_EVENT_MODE_CHANGING);
+		}
+	}
+
 	return 0;
 }

@@ -14606,6 +14616,82 @@ static void intel_setup_outputs(struct drm_device *dev)
 	drm_helper_move_panel_connectors_to_head(dev);
 }

+void chv_set_lpe_audio_reg_pipe(struct drm_device *dev,
+				int encoder_type, enum port port)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_encoder *intel_encoder;
+	struct hdmi_audio_priv *hdmi_priv = get_hdmi_priv();
+
+	if(!hdmi_priv) {
+		DRM_DEBUG_KMS("hdmi_priv was never allocated\n");
+		return;
+	}
+
+	/*
+	 * Due to hardware limitaion, Port D will always
+	 * be driven by Pipe C. So Port B and Port C will
+	 * be driven by either Pipe A or PipeB, depending
+	 * on whether the LFP is MIPI or EDP.
+	 */
+
+	if (port == PORT_D) {
+		hdmi_priv->hdmi_lpe_audio_reg =
+			I915_HDMI_AUDIO_LPE_C_CONFIG;
+		hdmi_priv->pipe = PIPE_C;
+		if (encoder_type == INTEL_OUTPUT_HDMI)
+			hdmi_priv->hdmi_reg = HDMID;
+		//else
+		//	hdmi_priv->hdmi_reg = CHV_DP_D;
+	} else {
+		list_for_each_entry(intel_encoder, &dev->
+			mode_config.encoder_list, base.head) {
+
+			/*
+			 * MIPI always comes on Pipe A or Pipe B
+			 * depending on Port A or Port C and EDP
+			 * comes on Pipe B. So the other pipe
+			 * will only be able to drive the DP.
+			 * MIPI on Port A is driven by Pipe A
+			 * and MIPI on Port C is driven by
+			 * Pipe B. So the other pipe will
+			 * drive DP.
+			 */
+
+			if (intel_encoder->type == INTEL_OUTPUT_EDP) {
+				hdmi_priv->hdmi_lpe_audio_reg =
+					I915_HDMI_AUDIO_LPE_A_CONFIG;
+				hdmi_priv->pipe = PIPE_A;
+				break;
+			} else if (intel_encoder->type == INTEL_OUTPUT_DSI &&
+				dev_priv->vbt.dsi.port == DVO_PORT_MIPIA) {
+				hdmi_priv->hdmi_lpe_audio_reg =
+					I915_HDMI_AUDIO_LPE_B_CONFIG;
+				hdmi_priv->pipe = PIPE_B;
+				break;
+			} else if (intel_encoder->type == INTEL_OUTPUT_DSI &&
+				dev_priv->vbt.dsi.port == DVO_PORT_MIPIC) {
+				hdmi_priv->hdmi_lpe_audio_reg =
+					I915_HDMI_AUDIO_LPE_A_CONFIG;
+				hdmi_priv->pipe = PIPE_A;
+				break;
+			}
+		}
+
+		if (port == PORT_B) {
+			if (encoder_type == INTEL_OUTPUT_HDMI)
+				hdmi_priv->hdmi_reg = HDMIB;
+			//else
+			//	hdmi_priv->hdmi_reg = VLV_DP_B;
+		} else {
+			if (encoder_type == INTEL_OUTPUT_HDMI)
+				hdmi_priv->hdmi_reg = HDMIC;
+			//else
+			//	hdmi_priv->hdmi_reg = VLV_DP_C;
+		}
+	}
+}
+
 static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
 {
 	struct drm_device *dev = fb->dev;
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 3b362ddb..dd289b7 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -38,6 +38,8 @@
 #include <drm/i915_drm.h>
 #include "i915_drv.h"

+static int i915_notify_had;
+
 static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi *intel_hdmi)
 {
 	return hdmi_to_dig_port(intel_hdmi)->base.base.dev;
@@ -1386,6 +1388,124 @@ intel_hdmi_set_edid(struct drm_connector *connector, bool force)
 	return connected;
 }

+static bool vlv_hdmi_live_status(struct drm_device *dev,
+			struct intel_hdmi *intel_hdmi)
+{
+	uint32_t bit;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_digital_port *intel_dig_port =
+					hdmi_to_dig_port(intel_hdmi);
+
+	DRM_DEBUG_KMS("Reading Live status");
+	switch (intel_dig_port->port) {
+	case PORT_B:
+		bit = HDMIB_HOTPLUG_LIVE_STATUS;
+		break;
+	case PORT_C:
+		bit = HDMIC_HOTPLUG_LIVE_STATUS;
+		break;
+	case PORT_D:
+		bit = HDMID_HOTPLUG_LIVE_STATUS;
+		break;
+	default:
+		bit = 0;
+	}
+
+	/* Return results in trems of connector */
+	return I915_READ(PORT_HOTPLUG_STAT) & bit;
+}
+
+
+/*
+ * intel_hdmi_live_status: detect live status of HDMI
+ * if device is gen 6 and above, read the live status reg
+ * else, do not block the detection, return true
+ */
+static bool intel_hdmi_live_status(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+
+	if (INTEL_INFO(dev)->gen > 6) {
+		/* Todo: Implement for other Gen 6+ archs*/
+		if (IS_VALLEYVIEW(dev))
+			return vlv_hdmi_live_status(dev, intel_hdmi);
+	}
+
+	return true;
+}
+
+/* Read DDC and get EDID */
+struct edid *intel_hdmi_get_edid(struct drm_connector *connector, bool force)
+{
+	bool current_state = false;
+	bool saved_state = false;
+
+	struct edid *new_edid = NULL;
+	struct i2c_adapter *adapter = NULL;
+	struct drm_device *dev = connector->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+	u32 hotplug_status = dev_priv->hotplug_status;
+	enum port hdmi_port = hdmi_to_dig_port(intel_hdmi)->port;
+	unsigned char retry = HDMI_EDID_RETRY_COUNT;
+
+	if (!intel_hdmi) {
+		DRM_ERROR("Invalid input to get hdmi\n");
+		return NULL;
+	}
+
+	/* Get the saved status from top half */
+	saved_state = hotplug_status & (1 << (HDMI_LIVE_STATUS_BASE - hdmi_port));
+
+	/*
+	 * Few monitors are slow to respond on EDID and live status,
+	 * so read live status multiple times within a max delay of 30ms
+	 */
+	do {
+		mdelay(HDMI_LIVE_STATUS_DELAY_STEP);
+		current_state = intel_hdmi_live_status(connector);
+		if (current_state)
+			break;
+	} while (retry--);
+
+	/* Compare current status, and saved status in top half */
+	if (current_state != saved_state)
+		DRM_DEBUG_DRIVER("Warning: Saved HDMI status != current status");
+
+	/* Read EDID if live status or saved status is up, or we are forced */
+	if (current_state || saved_state || force) {
+
+		adapter = intel_gmbus_get_adapter(dev_priv,
+					intel_hdmi->ddc_bus);
+		if (!adapter) {
+			DRM_ERROR("Get_hdmi cant get adapter\n");
+			return NULL;
+		}
+
+		/*
+		 * Few monitors issue EDID after some delay, so give them
+		 * some chances, but within 30ms
+		 */
+		retry = 3;
+READ_EDID:
+		new_edid = drm_get_edid(connector, adapter);
+		if (!new_edid) {
+			if (retry--) {
+				mdelay(HDMI_LIVE_STATUS_DELAY_STEP);
+				goto READ_EDID;
+			}
+
+			DRM_ERROR("Get_hdmi cant read edid\n");
+			return NULL;
+		}
+
+		DRM_DEBUG_KMS("Live status up, got EDID");
+	}
+
+	return new_edid;
+}
+
 static enum drm_connector_status
 intel_hdmi_detect(struct drm_connector *connector, bool force)
 {
@@ -1394,6 +1514,8 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
 	bool live_status = false;
 	unsigned int try;
+	bool inform_audio = false;
+	struct drm_device *dev = connector->dev;

 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 		      connector->base.id, connector->name);
@@ -1422,6 +1544,31 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)

 	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);

+	/* Need to inform audio about the event */
+	intel_hdmi = intel_attached_hdmi(connector);
+	if (intel_hdmi->has_audio)
+		inform_audio = true;
+
+	if (status == connector_status_connected) {
+		if (intel_hdmi->has_audio)
+			i915_notify_had = 1;
+	} else {
+		struct intel_digital_port *intel_dig_port =
+				hdmi_to_dig_port(intel_hdmi);
+
+		chv_set_lpe_audio_reg_pipe(dev, INTEL_OUTPUT_HDMI,
+					intel_dig_port->port);
+		/* Send a disconnect event to audio */
+		if (inform_audio) {
+			DRM_DEBUG_DRIVER("Sending event to audio");
+			mid_hdmi_audio_signal_event(dev_priv->dev,
+			HAD_EVENT_HOT_UNPLUG);
+		}
+	}
+
+	if (IS_VALLEYVIEW(dev))
+		i915_hdmi_state = status;
+
 	return status;
 }

@@ -1445,12 +1592,29 @@ intel_hdmi_force(struct drm_connector *connector)
 static int intel_hdmi_get_modes(struct drm_connector *connector)
 {
 	struct edid *edid;
+	struct intel_encoder *intel_encoder = intel_attached_encoder(connector);
+	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
+	struct intel_digital_port *intel_dig_port =
+				hdmi_to_dig_port(intel_hdmi);
+	struct drm_device *dev = connector->dev;
+	int ret;
+	struct drm_i915_private *dev_priv = connector->dev->dev_private;

 	edid = to_intel_connector(connector)->detect_edid;
 	if (edid == NULL)
 		return 0;

-	return intel_connector_update_modes(connector, edid);
+	ret = intel_connector_update_modes(connector, edid);
+
+	if (i915_notify_had) {
+		chv_set_lpe_audio_reg_pipe(dev, INTEL_OUTPUT_HDMI,
+					intel_dig_port->port);
+		mid_hdmi_audio_signal_event(dev_priv->dev,
+			HAD_EVENT_HOT_PLUG);
+		i915_notify_had = 0;
+	}
+
+	return ret;
 }

 static bool
@@ -2149,6 +2313,20 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 	}
+
+	i915_notify_had = 1;
+}
+
+/* Added for HDMI Audio */
+void i915_had_wq(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv = container_of(work,
+		struct drm_i915_private, hdmi_audio_wq);
+
+	if (i915_hdmi_state == connector_status_connected) {
+		mid_hdmi_audio_signal_event(dev_priv->dev,
+			HAD_EVENT_HOT_PLUG);
+	}
 }

 void intel_hdmi_init(struct drm_device *dev,
@@ -2157,7 +2335,10 @@ void intel_hdmi_init(struct drm_device *dev,
 	struct intel_digital_port *intel_dig_port;
 	struct intel_encoder *intel_encoder;
 	struct intel_connector *intel_connector;
-
+	/* Added for HDMI Audio */
+	struct hdmi_audio_priv *hdmi_priv;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
 	intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
 	if (!intel_dig_port)
 		return;
@@ -2168,6 +2349,7 @@ void intel_hdmi_init(struct drm_device *dev,
 		return;
 	}

+
 	intel_encoder = &intel_dig_port->base;

 	drm_encoder_init(dev, &intel_encoder->base, &intel_hdmi_enc_funcs,
@@ -2226,4 +2408,29 @@ void intel_hdmi_init(struct drm_device *dev,
 	intel_dig_port->dp.output_reg = INVALID_MMIO_REG;

 	intel_hdmi_init_connector(intel_dig_port, intel_connector);
+
+	/* Added for HDMI Audio */
+	/* HDMI private data */
+	INIT_WORK(&dev_priv->hdmi_audio_wq, i915_had_wq);
+	hdmi_priv = kzalloc(sizeof(struct hdmi_audio_priv), GFP_KERNEL);
+	if (!hdmi_priv) {
+		pr_err("failed to allocate memory");
+	} else {
+		hdmi_priv->dev = dev;
+		if (IS_CHERRYVIEW(dev)) {
+			// FIXME: plb: looks wrong
+			// mapping between stream and Hdmi port ?
+			hdmi_priv->hdmi_reg = HDMIC;
+			hdmi_priv->hdmi_lpe_audio_reg =
+					I915_HDMI_AUDIO_LPE_C_CONFIG;
+		} else {
+			hdmi_priv->hdmi_reg = HDMIB;
+			hdmi_priv->hdmi_lpe_audio_reg =
+					I915_HDMI_AUDIO_LPE_A_CONFIG;
+		}
+		hdmi_priv->monitor_type = MONITOR_TYPE_HDMI;
+		hdmi_priv->is_hdcp_supported = true;
+		i915_hdmi_audio_init(hdmi_priv);
+	}
+
 }

From b009763ab63002ca2b6d2e5ca8764d2e93a1fcee Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Tue, 1 Mar 2016 16:25:04 -0600
Subject: [PATCH 04/12] drm/i915: power-related changes non-HDAudio HDMI
 interface

PM and RPM changes for interface available on Baytrail and CherryTrail

This driver was downloaded from https://github.com/01org/baytrailaudio/

...and had the changes to .config stripped and the revert on sound/init.c

Clean-up, port to 4.4 and intel-drm by Pierre Bossart

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_rpm.c | 476 ++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_pm.c |  53 +++++
 2 files changed, 529 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/i915_rpm.c

diff --git a/drivers/gpu/drm/i915/i915_rpm.c b/drivers/gpu/drm/i915/i915_rpm.c
new file mode 100644
index 0000000..511311c
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_rpm.c
@@ -0,0 +1,476 @@
+/*
+ * Copyright 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author:
+ * Naresh Kumar Kachhi <naresh.kumar.kachhi@intel.com>
+ */
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "intel_drv.h"
+#include <linux/console.h>
+#ifdef CONFIG_PM_RUNTIME
+#include <linux/pm_runtime.h>
+#endif
+#include <linux/proc_fs.h>  /* Needed for procfs access */
+#include <linux/fs.h>	    /* For the basic file system */
+#include <linux/kernel.h>
+
+#define RPM_AUTOSUSPEND_DELAY 500
+
+#ifdef CONFIG_PM_RUNTIME
+
+/**
+ * - Where should we use get/put?
+ *   Get/put should be used very carefully as we might end up in weird states
+ *   if not used properly (see the Note below). We want to cover all the
+ *   acesses that might result in accessing rings/display/registers/gtt etc
+ *   Mostly covering ioctls and drm callbacks should be enough. You can
+ *   avoid those which does not access any HW.
+ *
+ * - When should we avoid get/put?
+ *   WQ and interrupts should be taken care in suspend path. We should
+ *   disable all the interrupts and cancel any pending WQs. Never try to
+ *   cover interrupt/WQ with get/put unless you are sure about it.
+ *
+ * Note:Following scenarios should be strictly avoided while using get_sync
+ * 1. Calling get_sync with struct_mutex or mode_config.mutex locked
+ *    - we acquire these locks in runtime_resume, so any call to get_sync
+ *    with these mutex locked might end up in a dead lock.
+ *    check_mutex_current function can be used to debug this scenario.
+ *    - Or let's say thread1 has done get_sync and is currently executing
+ *    runtime_resume function. Before thread1 is able to acquire these
+ *    mutex, thread2 acquires the mutex and does a get_sync. Now thread1
+ *    is waiting for mutex and thread2 is waiting for dev->power.lock
+ *    resulting in a deadlock. Use check_mutex to debug this.
+ * 2. Calling get_sync from runtime_resume path
+ *    runtime_resume is called with dev->power.lock held. doing get_sync
+ *    in same path will end up in deadlock
+ */
+
+#define RPM_PROC_ENTRY_FILENAME		"i915_rpm_op"
+#define RPM_PROC_ENTRY_DIRECTORY	"driver/i915rpm"
+
+int i915_rpm_get_procfs(struct inode *inode, struct file *file);
+int i915_rpm_put_procfs(struct inode *inode, struct file *file);
+/* proc file operations supported */
+static const struct file_operations rpm_file_ops = {
+	.owner		= THIS_MODULE,
+	.open		= i915_rpm_get_procfs,
+	.release	= i915_rpm_put_procfs,
+};
+
+bool i915_pm_runtime_enabled(struct device *dev)
+{
+	return pm_runtime_enabled(dev);
+}
+
+void i915_rpm_enable(struct device *dev)
+{
+	int cur_status = pm_runtime_enabled(dev);
+
+	if (!cur_status) {
+		pm_runtime_enable(dev);
+		pm_runtime_allow(dev);
+	}
+}
+
+void i915_rpm_disable(struct drm_device *drm_dev)
+{
+	struct device *dev = drm_dev->dev;
+	int cur_status = pm_runtime_enabled(dev);
+
+	if (cur_status) {
+		pm_runtime_forbid(dev);
+		pm_runtime_disable(dev);
+	}
+}
+
+static int i915_rpm_procfs_init(struct drm_device *drm_dev)
+{
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+
+	dev_priv->rpm.i915_proc_dir = NULL;
+	dev_priv->rpm.i915_proc_file = NULL;
+
+	/**
+	 * Create directory for rpm file(s)
+	 */
+	dev_priv->rpm.i915_proc_dir = proc_mkdir(RPM_PROC_ENTRY_DIRECTORY,
+						 NULL);
+	if (dev_priv->rpm.i915_proc_dir == NULL) {
+		DRM_ERROR("Could not initialize %s\n",
+				RPM_PROC_ENTRY_DIRECTORY);
+		return -ENOMEM;
+	}
+	/**
+	 * Create the /proc file
+	 */
+	dev_priv->rpm.i915_proc_file = proc_create_data(
+						RPM_PROC_ENTRY_FILENAME,
+						S_IRUGO | S_IWUSR,
+						dev_priv->rpm.i915_proc_dir,
+						&rpm_file_ops,
+						drm_dev);
+	/* check if file is created successfuly */
+	if (dev_priv->rpm.i915_proc_file == NULL) {
+		DRM_ERROR("Could not initialize %s/%s\n",
+			RPM_PROC_ENTRY_DIRECTORY, RPM_PROC_ENTRY_FILENAME);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static int i915_rpm_procfs_deinit(struct drm_device *drm_dev)
+{
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+	/* Clean up proc file */
+	if (dev_priv->rpm.i915_proc_file) {
+		remove_proc_entry(RPM_PROC_ENTRY_FILENAME,
+				 dev_priv->rpm.i915_proc_dir);
+		dev_priv->rpm.i915_proc_file = NULL;
+	}
+	if (dev_priv->rpm.i915_proc_dir) {
+		remove_proc_entry(RPM_PROC_ENTRY_DIRECTORY, NULL);
+		dev_priv->rpm.i915_proc_dir = NULL;
+	}
+	return 0;
+}
+
+/* RPM init */
+int i915_rpm_init(struct drm_device *drm_dev)
+{
+	int ret = 0;
+	struct device *dev = drm_dev->dev;
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+
+	ret = i915_rpm_procfs_init(drm_dev);
+	if (ret)
+		DRM_ERROR("unable to initialize procfs entry");
+	ret = pm_runtime_set_active(dev);
+	dev_priv->rpm.ring_active = false;
+	atomic_set(&dev_priv->rpm.procfs_count, 0);
+	pm_runtime_allow(dev);
+	/* enable Auto Suspend */
+	pm_runtime_set_autosuspend_delay(dev, RPM_AUTOSUSPEND_DELAY);
+	pm_runtime_use_autosuspend(dev);
+	if (dev->power.runtime_error)
+		DRM_ERROR("rpm init: error = %d\n", dev->power.runtime_error);
+
+	return ret;
+}
+
+int i915_rpm_deinit(struct drm_device *drm_dev)
+{
+	struct device *dev = drm_dev->dev;
+
+	pm_runtime_forbid(dev);
+	pm_runtime_set_suspended(dev);
+	pm_runtime_get_noresume(dev);
+	if (dev->power.runtime_error)
+		DRM_ERROR("rpm init: error = %d\n", dev->power.runtime_error);
+
+	i915_rpm_procfs_deinit(drm_dev);
+	return 0;
+}
+
+/**
+ * We have different flavour of get/put based on access type (ring/disp/
+ * vxd etc). this is done based on different requirements and to make
+ * debugging a little easier. Debugfs introduces separate counter for
+ * each type.
+ */
+
+/**
+ * Once we have scheduled commands on GPU, it might take a while GPU
+ * to execute them. Following is done to make sure Gfx is in D0i0 while
+ * GPU is executing the commands.
+ * 1. For IOCTLS make sure we are in D0i0 by calling "get_ioctl".
+ * 2. if IOCTL scheudles GPU commands using rings do the following
+ *  a. For all ring accesses make sure we add a request in the request
+ *     list and schedule a work item to track the "seq no". This
+ *     is done by using "i915_add_request" or "i915_add_request_no_flush"
+ *     functions.
+ *  b. If request list was empty, we do a "get_ring". This will increment
+ *     ref count to make sure GPU will be in D0 state.
+ *  c. Once the list becomes empty call put_ring
+ *
+ * Note: All the ring accesses are covered with struct_mutex. So we
+ * don't need any synchronization to protect ring_active.
+ */
+int i915_rpm_get_ring(struct drm_device *drm_dev)
+{
+	struct intel_engine_cs *ring;
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+	int i;
+	bool idle = true;
+
+	for_each_ring(ring, dev_priv, i)
+		idle &= list_empty(&ring->request_list);
+
+	if (idle) {
+		if (!dev_priv->rpm.ring_active) {
+			dev_priv->rpm.ring_active = true;
+			pm_runtime_get_noresume(drm_dev->dev);
+		}
+	}
+
+	return 0;
+}
+
+int i915_rpm_put_ring(struct drm_device *drm_dev)
+{
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+
+	if (dev_priv->rpm.ring_active) {
+		/* Mark last time it was busy and schedule a autosuspend */
+		pm_runtime_mark_last_busy(drm_dev->dev);
+		pm_runtime_put_autosuspend(drm_dev->dev);
+		dev_priv->rpm.ring_active = false;
+	}
+	return 0;
+}
+
+/**
+ * To cover the function pointers that are assigned to drm structures
+ * and can be called from drm
+ */
+int i915_rpm_get_callback(struct drm_device *drm_dev)
+{
+	return pm_runtime_get_sync(drm_dev->dev);
+}
+
+int i915_rpm_put_callback(struct drm_device *drm_dev)
+{
+	pm_runtime_mark_last_busy(drm_dev->dev);
+	return pm_runtime_put_autosuspend(drm_dev->dev);
+}
+
+/**
+ * early_suspend/DSR should call this function to notify PM Core about
+ * display idleness
+ */
+int i915_rpm_get_disp(struct drm_device *drm_dev)
+{
+	return pm_runtime_get_sync(drm_dev->dev);
+}
+
+int i915_rpm_put_disp(struct drm_device *drm_dev)
+{
+	pm_runtime_mark_last_busy(drm_dev->dev);
+	return pm_runtime_put_autosuspend(drm_dev->dev);
+}
+
+/** to cover the ioctls with get/put*/
+int i915_rpm_get_ioctl(struct drm_device *drm_dev)
+{
+	/* Don't do anything if device is not ready */
+	if (drm_device_is_unplugged(drm_dev))
+		return 0;
+
+	return pm_runtime_get_sync(drm_dev->dev);
+}
+
+int i915_rpm_put_ioctl(struct drm_device *drm_dev)
+{
+	/* Don't do anything if device is not ready */
+	if (drm_device_is_unplugged(drm_dev))
+		return 0;
+
+	pm_runtime_mark_last_busy(drm_dev->dev);
+	return pm_runtime_put_autosuspend(drm_dev->dev);
+}
+
+/* these operations are caled from user mode (CoreU) to make sure
+ * Gfx is up before register accesses from user mode
+ */
+int i915_rpm_get_procfs(struct inode *inode, struct file *file)
+{
+	struct drm_device *dev = PDE_DATA(inode);
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	atomic_inc(&dev_priv->rpm.procfs_count);
+	pm_runtime_get_sync(dev->dev);
+	return 0;
+}
+
+int i915_rpm_put_procfs(struct inode *inode, struct file *file)
+{
+	struct drm_device *dev = PDE_DATA(inode);
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+	atomic_dec(&dev_priv->rpm.procfs_count);
+	return 0;
+}
+
+/**
+ * VXD driver need to call this to make sure Gfx is in D0i0
+ * while VXD is on
+ */
+#ifdef CONFIG_DRM_VXD_BYT
+int i915_rpm_get_vxd(struct drm_device *drm_dev)
+{
+	return pm_runtime_get_sync(drm_dev->dev);
+}
+EXPORT_SYMBOL(i915_rpm_get_vxd);
+
+/**
+ * VXD driver need to call this to notify Gfx that it is
+ * done with HW accesses
+ */
+int i915_rpm_put_vxd(struct drm_device *drm_dev)
+{
+	pm_runtime_mark_last_busy(drm_dev->dev);
+	return pm_runtime_put_autosuspend(drm_dev->dev);
+}
+EXPORT_SYMBOL(i915_rpm_put_vxd);
+#endif
+
+/* mainly for debug purpose, check if the access is valid */
+bool i915_rpm_access_check(struct drm_device *dev)
+{
+	if (dev->dev->power.runtime_status == RPM_SUSPENDED) {
+		DRM_ERROR("invalid access, will cause Hard Hang\n");
+		dump_stack();
+		return false;
+	}
+	return true;
+}
+
+/* mainly for debug purpose, check if mutex is locked by
+ * current thread
+ */
+int check_mutex_current(struct drm_device *drm_dev)
+{
+	int ret = 0;
+
+	if ((mutex_is_locked(&drm_dev->mode_config.mutex)) &&
+			(drm_dev->mode_config.mutex.owner == current)) {
+		DRM_ERROR("config mutex locked by current thread\n");
+		dump_stack();
+		ret = -1;
+	}
+	if ((mutex_is_locked(&drm_dev->struct_mutex)) &&
+			(drm_dev->struct_mutex.owner == current)) {
+		DRM_ERROR("struct mutex locked by current thread\n");
+		dump_stack();
+		ret = -2;
+	}
+	return ret;
+}
+
+int check_mutex(struct drm_device *drm_dev)
+{
+	int ret = 0;
+
+	if (mutex_is_locked(&drm_dev->mode_config.mutex)) {
+		DRM_ERROR("config mutex locked\n");
+		dump_stack();
+		ret = -1;
+	}
+	if (mutex_is_locked(&drm_dev->struct_mutex)) {
+		DRM_ERROR("struct mutex locked\n");
+		dump_stack();
+		ret = -2;
+	}
+	return ret;
+}
+
+/* Check for current runtime state */
+bool i915_is_device_active(struct drm_device *dev)
+{
+	return (dev->dev->power.runtime_status == RPM_ACTIVE);
+}
+
+bool i915_is_device_resuming(struct drm_device *dev)
+{
+	return (dev->dev->power.runtime_status == RPM_RESUMING);
+}
+
+bool i915_is_device_suspended(struct drm_device *dev)
+{
+	return (dev->dev->power.runtime_status == RPM_SUSPENDED);
+}
+
+bool i915_is_device_suspending(struct drm_device *dev)
+{
+	return (dev->dev->power.runtime_status == RPM_SUSPENDING);
+}
+
+#else /*CONFIG_PM_RUNTIME*/
+int i915_rpm_init(struct drm_device *dev) {return 0; }
+int i915_rpm_deinit(struct drm_device *dev) {return 0; }
+int i915_rpm_get(struct drm_device *dev, u32 flags) {return 0; }
+int i915_rpm_put(struct drm_device *dev, u32 flags) {return 0; }
+int i915_rpm_get_ring(struct drm_device *dev) {return 0; }
+int i915_rpm_put_ring(struct drm_device *dev) {return 0; }
+int i915_rpm_get_callback(struct drm_device *dev) {return 0; }
+int i915_rpm_put_callback(struct drm_device *dev) {return 0; }
+int i915_rpm_get_ioctl(struct drm_device *dev) {return 0; }
+int i915_rpm_put_ioctl(struct drm_device *dev) {return 0; }
+int i915_rpm_get_disp(struct drm_device *dev) {return 0; }
+int i915_rpm_put_disp(struct drm_device *dev) {return 0; }
+int i915_rpm_get_procfs(struct inode *inode,
+			      struct file *file) {return 0; }
+int i915_rpm_put_procfs(struct inode *inode,
+			      struct file *file) {return 0; }
+#ifdef CONFIG_DRM_VXD_BYT
+int i915_rpm_get_vxd(struct drm_device *dev) {return 0; }
+int i915_rpm_put_vxd(struct drm_device *dev) {return 0; }
+#endif
+
+bool i915_is_device_active(struct drm_device *dev)
+{
+	return true;
+}
+
+bool i915_is_device_resuming(struct drm_device *dev)
+{
+	return false;
+}
+
+bool i915_is_device_suspended(struct drm_device *dev)
+{
+	return false;
+}
+
+bool i915_is_device_suspending(struct drm_device *dev)
+{
+	return false;
+}
+
+bool i915_rpm_access_check(struct drm_device *dev)
+{
+	return true;
+}
+bool i915_pm_runtime_enabled(struct device *dev)
+{
+	return false;
+}
+
+void i915_rpm_enable(struct device *dev) {}
+
+void i915_rpm_disable(struct drm_device *drm_dev) {}
+
+#endif /*CONFIG_PM_RUNTIME*/
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b28c29f..916c1b1 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -31,6 +31,17 @@
 #include "../../../platform/x86/intel_ips.h"
 #include <linux/module.h>

+typedef enum _UHBUsage {
+	OSPM_UHB_ONLY_IF_ON = 0,
+	OSPM_UHB_FORCE_POWER_ON,
+} UHBUsage;
+
+static struct drm_device *gdev;
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	#include <linux/earlysuspend.h>
+#endif
+
 /**
  * RC6 is a special power stage which allows the GPU to enter an very
  * low-voltage mode when idle, using down to 0V while at this stage.  This
@@ -6964,6 +6975,7 @@ void intel_suspend_hw(struct drm_device *dev)
 void intel_init_pm(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	gdev = dev;

 	intel_fbc_init(dev_priv);

@@ -7257,3 +7269,44 @@ void intel_pm_setup(struct drm_device *dev)
 	atomic_set(&dev_priv->pm.wakeref_count, 0);
 	atomic_set(&dev_priv->pm.atomic_seq, 0);
 }
+
+bool ospm_power_is_hw_on(int hw_islands)
+{
+#if 0
+	struct drm_device *drm_dev = gdev;
+	unsigned long flags;
+	bool ret = false;
+	struct drm_i915_private *dev_priv = drm_dev->dev_private;
+	u32 data = vlv_punit_read(dev_priv, VLV_IOSFSB_PWRGT_STATUS);
+
+	if ((VLV_POWER_GATE_DISPLAY_MASK & data)
+			== VLV_POWER_GATE_DISPLAY_MASK) {
+		DRM_ERROR("Display Island not ON\n");
+		return false;
+	} else {
+		return true;
+	}
+#endif
+	return true;
+}
+EXPORT_SYMBOL(ospm_power_is_hw_on);
+
+/* Dummy Function for HDMI Audio Power management.
+ * Will be updated once S0iX code is integrated
+ */
+bool ospm_power_using_hw_begin(int hw_island, UHBUsage usage)
+{
+	struct drm_device *drm_dev = gdev;
+
+	i915_rpm_get_disp(drm_dev);
+	return i915_is_device_active(drm_dev);
+}
+EXPORT_SYMBOL(ospm_power_using_hw_begin);
+
+void ospm_power_using_hw_end(int hw_island)
+{
+	struct drm_device *drm_dev = gdev;
+
+	i915_rpm_put_disp(drm_dev);
+}
+EXPORT_SYMBOL(ospm_power_using_hw_end);

From 360a6900efb298201fc2f44b991f1a7d2c422ecb Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Thu, 3 Mar 2016 11:08:10 -0600
Subject: [PATCH 05/12] drm/i915: Add API code for non-HDAudio HDMI interface

Add API code for interface available on Baytrail and CherryTrail

Initial code was downloaded from https://github.com/01org/baytrailaudio/
...and had the changes to .config stripped and the revert on sound/init.c
done by David Henningson

Clean-up, port to 4.5 and intel-drm by Pierre Bossart
CherryTrail support by Jerome Anand

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 drivers/gpu/drm/i915/hdmi_audio_if.c | 425 +++++++++++++++++++++++++++++++++++
 1 file changed, 425 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/hdmi_audio_if.c

diff --git a/drivers/gpu/drm/i915/hdmi_audio_if.c b/drivers/gpu/drm/i915/hdmi_audio_if.c
new file mode 100644
index 0000000..c7c5f8f
--- /dev/null
+++ b/drivers/gpu/drm/i915/hdmi_audio_if.c
@@ -0,0 +1,425 @@
+/*
+ * Copyright (c) 2010, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * Authors:
+ *	jim liu <jim.liu@intel.com>
+ *	Uma Shankar <uma.shankar@intel.com>
+ */
+
+#include <drm/drmP.h>
+#include "hdmi_audio_if.h"
+#include "i915_drv.h"
+#include "i915_reg.h"
+
+#define CONFIG_SUPPORT_HDMI_AUDIO
+#ifdef CONFIG_SUPPORT_HDMI_AUDIO
+
+int i915_hdmi_state;
+
+/*
+ * Audio register range 0x65000 to 0x65FFF
+ */
+
+#define IS_HDMI_AUDIO_I915(reg) ((reg >= 0x65000) && (reg < 0x65FFF))
+
+/* Added for HDMI Audio */
+#define HAD_MAX_ELD_BYTES 84
+uint8_t hdmi_eld[HAD_MAX_ELD_BYTES];
+
+static struct hdmi_audio_priv *hdmi_priv;
+
+void i915_hdmi_audio_init(struct hdmi_audio_priv *p_hdmi_priv)
+{
+	hdmi_priv = p_hdmi_priv;
+}
+
+/* Added for HDMI Audio */
+void hdmi_get_eld(uint8_t *eld)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	memcpy(hdmi_eld, eld, HAD_MAX_ELD_BYTES);
+	mid_hdmi_audio_signal_event(dev_priv->dev, HAD_EVENT_HOT_PLUG);
+}
+
+static inline int android_hdmi_get_eld(struct drm_device *dev, void *eld)
+{
+	memcpy(eld, hdmi_eld, HAD_MAX_ELD_BYTES);
+	return 0;
+}
+
+struct hdmi_audio_priv *get_hdmi_priv()
+{
+	return hdmi_priv;
+}
+
+/*
+ * return whether HDMI audio device is busy.
+ */
+bool mid_hdmi_audio_is_busy(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int hdmi_audio_busy = 0;
+	hdmi_audio_event_t hdmi_audio_event;
+
+	if (i915_hdmi_state == connector_status_disconnected) {
+		/* HDMI is not connected, assuming audio device is idle. */
+		return false;
+	}
+
+	if (dev_priv->had_interface) {
+		hdmi_audio_event.type = HAD_EVENT_QUERY_IS_AUDIO_BUSY;
+		hdmi_audio_busy = dev_priv->had_interface->query(
+				dev_priv->had_pvt_data,
+				hdmi_audio_event);
+		return hdmi_audio_busy != 0;
+	}
+	return false;
+}
+
+/*
+ * return whether HDMI audio device is suspended.
+ */
+bool mid_hdmi_audio_suspend(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	hdmi_audio_event_t hdmi_audio_event;
+	int ret = 0;
+
+	if (i915_hdmi_state == connector_status_disconnected) {
+		/* HDMI is not connected, assuming audio device
+		 * is suspended already.
+		 */
+		return true;
+	}
+	DRM_DEBUG_DRIVER("%s: i915_hdmi_state %d", __func__,
+			i915_hdmi_state);
+
+	if (dev_priv->had_interface) {
+		hdmi_audio_event.type = 0;
+		ret = dev_priv->had_interface->suspend(dev_priv->had_pvt_data,
+				hdmi_audio_event);
+		return (ret == 0) ? true : false;
+	}
+	return true;
+}
+
+void mid_hdmi_audio_resume(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+
+	if (i915_hdmi_state == connector_status_disconnected) {
+		/* HDMI is not connected, there is no need
+		 * to resume audio device.
+		 */
+		return;
+	}
+	DRM_DEBUG_DRIVER("%s: i915_hdmi_state %d", __func__,
+				i915_hdmi_state);
+
+	if (dev_priv->had_interface)
+		dev_priv->had_interface->resume(dev_priv->had_pvt_data);
+}
+
+void mid_hdmi_audio_signal_event(struct drm_device *dev,
+		enum had_event_type event)
+{
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+
+	if (dev_priv->had_event_callbacks)
+		(*dev_priv->had_event_callbacks)(event,
+			dev_priv->had_pvt_data);
+}
+
+/**
+ * hdmi_audio_write:
+ * used to write into display controller HDMI audio registers.
+ *
+ */
+static int hdmi_audio_write(uint32_t reg, uint32_t val)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int ret = 0;
+
+	if (hdmi_priv->monitor_type == MONITOR_TYPE_DVI)
+		return 0;
+
+	if (IS_HDMI_AUDIO_I915(reg))
+		I915_WRITE(_MMIO(VLV_DISPLAY_BASE + reg), val);
+	else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+/**
+ * hdmi_audio_read:
+ * used to get the register value read from
+ * display controller HDMI audio registers.
+ */
+static int hdmi_audio_read(uint32_t reg, uint32_t *val)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int ret = 0;
+
+	if (hdmi_priv->monitor_type == MONITOR_TYPE_DVI)
+		return 0;
+
+	if (IS_HDMI_AUDIO_I915(reg))
+		*val = I915_READ(_MMIO(VLV_DISPLAY_BASE + reg));
+	else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+/**
+ * hdmi_audio_rmw:
+ * used to update the masked bits in display controller HDMI audio registers .
+ *
+ */
+static int hdmi_audio_rmw(uint32_t reg, uint32_t val, uint32_t mask)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int ret = 0;
+	uint32_t val_tmp = 0;
+
+	if (IS_HDMI_AUDIO_I915(reg)) {
+		val_tmp = (val & mask) |
+			(I915_READ(_MMIO(VLV_DISPLAY_BASE + reg)) & ~mask);
+		I915_WRITE(_MMIO(VLV_DISPLAY_BASE + reg), val_tmp);
+	} else {
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/**
+ * hdmi_audio_get_caps:
+ * used to return the HDMI audio capabilities.
+ * e.g. resolution, frame rate.
+ */
+static int hdmi_audio_get_caps(enum had_caps_list get_element,
+			void *capabilities)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int ret = 0;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	switch (get_element) {
+	case HAD_GET_ELD:
+		ret = android_hdmi_get_eld(dev, capabilities);
+		break;
+	case HAD_GET_SAMPLING_FREQ:
+		/* ToDo: Verify if sampling freq logic is correct */
+		memcpy(capabilities, &(dev_priv->tmds_clock_speed),
+			sizeof(uint32_t));
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+/**
+ * hdmi_audio_get_register_base
+ * used to get the current hdmi base address
+ */
+int hdmi_audio_get_register_base(uint32_t *reg_base)
+{
+	*reg_base = hdmi_priv->hdmi_lpe_audio_reg;
+	return 0;
+}
+
+/**
+ * hdmi_audio_set_caps:
+ * used to set the HDMI audio capabilities.
+ * e.g. Audio INT.
+ */
+static int hdmi_audio_set_caps(enum had_caps_list set_element,
+			void *capabilties)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int ret = 0;
+	u32 hdmi_reg;
+	u32 int_masks = 0;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	switch (set_element) {
+	case HAD_SET_ENABLE_AUDIO:
+		hdmi_reg = I915_READ(_MMIO(hdmi_priv->hdmi_reg));
+		if (hdmi_reg & PORT_ENABLE)
+			hdmi_reg |= SDVO_AUDIO_ENABLE;
+
+		I915_WRITE(_MMIO(hdmi_priv->hdmi_reg), hdmi_reg);
+		I915_READ(_MMIO(hdmi_priv->hdmi_reg));
+		break;
+	case HAD_SET_DISABLE_AUDIO:
+		hdmi_reg = I915_READ(_MMIO(hdmi_priv->hdmi_reg)) &
+			~SDVO_AUDIO_ENABLE;
+		I915_WRITE(_MMIO(hdmi_priv->hdmi_reg), hdmi_reg);
+		I915_READ(_MMIO(hdmi_priv->hdmi_reg));
+		break;
+
+	case HAD_SET_ENABLE_AUDIO_INT:
+		if (*((u32 *)capabilties) & HDMI_AUDIO_UNDERRUN)
+			int_masks |= I915_HDMI_AUDIO_UNDERRUN_ENABLE;
+		dev_priv->hdmi_audio_interrupt_mask |= int_masks;
+		i915_enable_hdmi_audio_int(dev);
+		break;
+	case HAD_SET_DISABLE_AUDIO_INT:
+		if (*((u32 *)capabilties) & HDMI_AUDIO_UNDERRUN)
+			int_masks |= I915_HDMI_AUDIO_UNDERRUN_ENABLE;
+		dev_priv->hdmi_audio_interrupt_mask &= ~int_masks;
+
+		i915_disable_hdmi_audio_int(dev);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static struct  hdmi_audio_registers_ops hdmi_audio_reg_ops = {
+	.hdmi_audio_get_register_base = hdmi_audio_get_register_base,
+	.hdmi_audio_read_register = hdmi_audio_read,
+	.hdmi_audio_write_register = hdmi_audio_write,
+	.hdmi_audio_read_modify = hdmi_audio_rmw,
+};
+
+static struct hdmi_audio_query_set_ops hdmi_audio_get_set_ops = {
+	.hdmi_audio_get_caps = hdmi_audio_get_caps,
+	.hdmi_audio_set_caps = hdmi_audio_set_caps,
+};
+
+int mid_hdmi_audio_setup(
+		had_event_call_back audio_callbacks,
+		struct hdmi_audio_registers_ops *reg_ops,
+		struct hdmi_audio_query_set_ops *query_ops)
+{
+	struct drm_device *dev = hdmi_priv->dev;
+	struct drm_i915_private *dev_priv =
+		(struct drm_i915_private *) dev->dev_private;
+	int ret = 0;
+
+	DRM_DEBUG_DRIVER("%s: called\n", __func__);
+
+	reg_ops->hdmi_audio_get_register_base =
+		(hdmi_audio_reg_ops.hdmi_audio_get_register_base);
+	reg_ops->hdmi_audio_read_register =
+		(hdmi_audio_reg_ops.hdmi_audio_read_register);
+	reg_ops->hdmi_audio_write_register =
+		(hdmi_audio_reg_ops.hdmi_audio_write_register);
+	reg_ops->hdmi_audio_read_modify =
+		(hdmi_audio_reg_ops.hdmi_audio_read_modify);
+	query_ops->hdmi_audio_get_caps =
+		hdmi_audio_get_set_ops.hdmi_audio_get_caps;
+	query_ops->hdmi_audio_set_caps =
+		hdmi_audio_get_set_ops.hdmi_audio_set_caps;
+
+	dev_priv->had_event_callbacks = audio_callbacks;
+
+	return ret;
+}
+EXPORT_SYMBOL(mid_hdmi_audio_setup);
+
+int mid_hdmi_audio_register(struct snd_intel_had_interface *driver,
+				void *had_data)
+{
+	struct drm_device *dev;
+	struct drm_i915_private *dev_priv;
+
+	DRM_DEBUG_DRIVER("%s: called\n", __func__);
+	if (!hdmi_priv)
+		return -ENODEV;
+
+	dev = hdmi_priv->dev;
+	dev_priv = (struct drm_i915_private *) dev->dev_private;
+	dev_priv->had_pvt_data = had_data;
+	dev_priv->had_interface = driver;
+
+	if (hdmi_priv->monitor_type == MONITOR_TYPE_DVI)
+		return 0;
+
+	/* The Audio driver is loading now and we need to notify
+	 * it if there is an HDMI device attached
+	 */
+	DRM_INFO("%s: Scheduling HDMI audio work queue\n", __func__);
+	schedule_work(&dev_priv->hdmi_audio_wq);
+
+	return 0;
+}
+EXPORT_SYMBOL(mid_hdmi_audio_register);
+#else
+bool hdmi_audio_is_busy(struct drm_device *dev)
+{
+	/* always in idle state */
+	return false;
+}
+
+bool hdmi_audio_suspend(struct drm_device *dev)
+{
+	/* always in suspend state */
+	return true;
+}
+
+void hdmi_audio_resume(struct drm_device *dev)
+{
+}
+
+void hdmi_audio_signal_event(struct drm_device *dev, enum had_event_type event)
+{
+}
+
+void i915_hdmi_audio_init(struct hdmi_audio_priv *hdmi_priv)
+{
+	DRM_INFO("%s: HDMI is not supported.\n", __func__);
+}
+
+int mid_hdmi_audio_setup(
+		had_event_call_back audio_callbacks,
+		struct hdmi_audio_registers_ops *reg_ops,
+		struct hdmi_audio_query_set_ops *query_ops)
+{
+	DRM_ERROR("%s: HDMI is not supported.\n", __func__);
+	return -ENODEV;
+}
+EXPORT_SYMBOL(mid_hdmi_audio_setup);
+
+int mid_hdmi_audio_register(struct snd_intel_had_interface *driver,
+			void *had_data)
+{
+	DRM_ERROR("%s: HDMI is not supported.\n", __func__);
+	return -ENODEV;
+}
+EXPORT_SYMBOL(mid_hdmi_audio_register);
+#endif

From 62adc203bbd9556c97ff848906f2f76f1cf5d1f0 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Tue, 1 Mar 2016 16:25:04 -0600
Subject: [PATCH 06/12] drm/i915: enable non-HDAudio HDMI interface Makefile

Makefile for all previous patches

This driver was downloaded from https://github.com/01org/baytrailaudio/

...and had the changes to .config stripped and the revert on sound/init.c

clean-up, port to 4.5 and intel-drm by Pierre Bossart

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 drivers/gpu/drm/i915/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 0851de07..2432085 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -12,7 +12,8 @@ i915-y := i915_drv.o \
 	  i915_sysfs.o \
 	  intel_csr.o \
 	  intel_pm.o \
-	  intel_runtime_pm.o
+	  intel_runtime_pm.o \
+	  hdmi_audio_if.o

 i915-$(CONFIG_COMPAT)   += i915_ioc32.o
 i915-$(CONFIG_DEBUG_FS) += i915_debugfs.o
@@ -37,6 +38,7 @@ i915-y += i915_cmd_parser.o \
 	  i915_trace_points.o \
 	  intel_lrc.o \
 	  intel_mocs.o \
+	  i915_rpm.o \
 	  intel_ringbuffer.o \
 	  intel_uncore.o


From 45ff48a26a923af4de33d810848e5cf7b1a00e68 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Thu, 3 Mar 2016 11:09:26 -0600
Subject: [PATCH 07/12] ALSA: Intel: Atom: add Atom non-HDAudio HDMI interface

Add support interface available on Baytrail and CherryTrail

Initial code was downloaded from https://github.com/01org/baytrailaudio/
...and had the changes to .config stripped and the revert on sound/init.c
and printk->pr_debug done by David Henningson

Clean-up, port to 4.5 and intel-drm by Pierre Bossart
CherryTrail support by Jerome Anand

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/Kconfig                              |    8 +
 sound/Makefile                             |    1 +
 sound/hdmi_audio/Makefile                  |    9 +
 sound/hdmi_audio/intel_mid_hdmi_audio.c    | 2027 ++++++++++++++++++++++++++++
 sound/hdmi_audio/intel_mid_hdmi_audio.h    |  740 ++++++++++
 sound/hdmi_audio/intel_mid_hdmi_audio_if.c |  533 ++++++++
 6 files changed, 3318 insertions(+)
 create mode 100644 sound/hdmi_audio/Makefile
 create mode 100644 sound/hdmi_audio/intel_mid_hdmi_audio.c
 create mode 100644 sound/hdmi_audio/intel_mid_hdmi_audio.h
 create mode 100644 sound/hdmi_audio/intel_mid_hdmi_audio_if.c

diff --git a/sound/Kconfig b/sound/Kconfig
index 5a240e0..75c679e 100644
--- a/sound/Kconfig
+++ b/sound/Kconfig
@@ -134,3 +134,11 @@ config AC97_BUS
 	  sound subsystem and other function drivers completely unrelated to
 	  sound although they're sharing the AC97 bus. Concerned drivers
 	  should "select" this.
+
+config SUPPORT_HDMI
+        bool "SUPPORT_HDMI"
+        depends on DRM_I915
+        default n
+        help
+          Choose this option to support HDMI.
+
diff --git a/sound/Makefile b/sound/Makefile
index 7732070..f2c5e82 100644
--- a/sound/Makefile
+++ b/sound/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DMASOUND) += oss/
 obj-$(CONFIG_SND) += core/ i2c/ drivers/ isa/ pci/ ppc/ arm/ sh/ synth/ usb/ \
 	firewire/ sparc/ spi/ parisc/ pcmcia/ mips/ soc/ atmel/ hda/
 obj-$(CONFIG_SND_AOA) += aoa/
+obj-$(CONFIG_SUPPORT_HDMI) += hdmi_audio/

 # This one must be compilable even if sound is configured out
 obj-$(CONFIG_AC97_BUS) += ac97_bus.o
diff --git a/sound/hdmi_audio/Makefile b/sound/hdmi_audio/Makefile
new file mode 100644
index 0000000..b28eb3b
--- /dev/null
+++ b/sound/hdmi_audio/Makefile
@@ -0,0 +1,9 @@
+DRIVER_NAME := hdmi_audio
+
+ccflags-y += -Idrivers/gpu/drm/i915
+
+$(DRIVER_NAME)-objs += \
+	intel_mid_hdmi_audio.o \
+	intel_mid_hdmi_audio_if.o
+
+obj-m += $(DRIVER_NAME).o
diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio.c b/sound/hdmi_audio/intel_mid_hdmi_audio.c
new file mode 100644
index 0000000..d8c5574
--- /dev/null
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio.c
@@ -0,0 +1,2027 @@
+/*
+ *   intel_mid_hdmi_audio.c - Intel HDMI audio driver for MID
+ *
+ *  Copyright (C) 2010 Intel Corp
+ *  Authors:	Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>
+ *		Ramesh Babu K V	<ramesh.babu@intel.com>
+ *		Vaibhav Agarwal <vaibhav.agarwal@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * ALSA driver for Intel MID HDMI audio controller
+ */
+
+#define pr_fmt(fmt)	"had: " fmt
+
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <sound/pcm.h>
+#include <sound/core.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+
+#include "intel_mid_hdmi_audio.h"
+
+#define PCM_INDEX		0
+#define MAX_PB_STREAMS		1
+#define MAX_CAP_STREAMS		0
+#define HDMI_AUDIO_DRIVER	"hdmi-audio"
+static DEFINE_MUTEX(had_mutex);
+
+/*standard module options for ALSA. This module supports only one card*/
+static int hdmi_card_index = SNDRV_DEFAULT_IDX1;
+static char *hdmi_card_id = SNDRV_DEFAULT_STR1;
+static struct snd_intelhad *had_data;
+
+module_param(hdmi_card_index, int, 0444);
+MODULE_PARM_DESC(hdmi_card_index,
+		"Index value for INTEL Intel HDMI Audio controller.");
+module_param(hdmi_card_id, charp, 0444);
+MODULE_PARM_DESC(hdmi_card_id,
+		"ID string for INTEL Intel HDMI Audio controller.");
+MODULE_AUTHOR("Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>");
+MODULE_AUTHOR("Ramesh Babu K V <ramesh.babu@intel.com>");
+MODULE_AUTHOR("Vaibhav Agarwal <vaibhav.agarwal@intel.com>");
+MODULE_DESCRIPTION("Intel HDMI Audio driver");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("{Intel,Intel_HAD}");
+MODULE_VERSION(HAD_DRIVER_VERSION);
+
+#define INFO_FRAME_WORD1	0x000a0184
+#define FIFO_THRESHOLD		0xFE
+#define DMA_FIFO_THRESHOLD	0x7
+#define BYTES_PER_WORD		0x4
+
+/* Sampling rate as per IEC60958 Ver 3 */
+#define CH_STATUS_MAP_32KHZ	0x3
+#define CH_STATUS_MAP_44KHZ	0x0
+#define CH_STATUS_MAP_48KHZ	0x2
+#define CH_STATUS_MAP_88KHZ	0x8
+#define CH_STATUS_MAP_96KHZ	0xA
+#define CH_STATUS_MAP_176KHZ	0xC
+#define CH_STATUS_MAP_192KHZ	0xE
+
+#define MAX_SMPL_WIDTH_20	0x0
+#define MAX_SMPL_WIDTH_24	0x1
+#define SMPL_WIDTH_16BITS	0x1
+#define SMPL_WIDTH_24BITS	0x5
+#define CHANNEL_ALLOCATION	0x1F
+#define MASK_BYTE0		0x000000FF
+#define VALID_DIP_WORDS		3
+#define LAYOUT0			0
+#define LAYOUT1			1
+#define SWAP_LFE_CENTER		0x00fac4c8
+#define AUD_CONFIG_CH_MASK_V2	0x70
+
+/*
+ * ELD SA bits in the CEA Speaker Allocation data block
+*/
+static int eld_speaker_allocation_bits[] = {
+	[0] = FL | FR,
+	[1] = LFE,
+	[2] = FC,
+	[3] = RL | RR,
+	[4] = RC,
+	[5] = FLC | FRC,
+	[6] = RLC | RRC,
+	/* the following are not defined in ELD yet */
+	[7] = 0,
+};
+
+/*
+ * This is an ordered list!
+ *
+ * The preceding ones have better chances to be selected by
+ * hdmi_channel_allocation().
+ */
+static struct cea_channel_speaker_allocation channel_allocations[] = {
+/*                        channel:   7     6    5    4    3     2    1    0  */
+{ .ca_index = 0x00,  .speakers = {   0,    0,   0,   0,   0,    0,  FR,  FL } },
+				/* 2.1 */
+{ .ca_index = 0x01,  .speakers = {   0,    0,   0,   0,   0,  LFE,  FR,  FL } },
+				/* Dolby Surround */
+{ .ca_index = 0x02,  .speakers = {   0,    0,   0,   0,  FC,    0,  FR,  FL } },
+				/* surround40 */
+{ .ca_index = 0x08,  .speakers = {   0,    0,  RR,  RL,   0,    0,  FR,  FL } },
+				/* surround41 */
+{ .ca_index = 0x09,  .speakers = {   0,    0,  RR,  RL,   0,  LFE,  FR,  FL } },
+				/* surround50 */
+{ .ca_index = 0x0a,  .speakers = {   0,    0,  RR,  RL,  FC,    0,  FR,  FL } },
+				/* surround51 */
+{ .ca_index = 0x0b,  .speakers = {   0,    0,  RR,  RL,  FC,  LFE,  FR,  FL } },
+				/* 6.1 */
+{ .ca_index = 0x0f,  .speakers = {   0,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
+				/* surround71 */
+{ .ca_index = 0x13,  .speakers = { RRC,  RLC,  RR,  RL,  FC,  LFE,  FR,  FL } },
+
+{ .ca_index = 0x03,  .speakers = {   0,    0,   0,   0,  FC,  LFE,  FR,  FL } },
+{ .ca_index = 0x04,  .speakers = {   0,    0,   0,  RC,   0,    0,  FR,  FL } },
+{ .ca_index = 0x05,  .speakers = {   0,    0,   0,  RC,   0,  LFE,  FR,  FL } },
+{ .ca_index = 0x06,  .speakers = {   0,    0,   0,  RC,  FC,    0,  FR,  FL } },
+{ .ca_index = 0x07,  .speakers = {   0,    0,   0,  RC,  FC,  LFE,  FR,  FL } },
+{ .ca_index = 0x0c,  .speakers = {   0,   RC,  RR,  RL,   0,    0,  FR,  FL } },
+{ .ca_index = 0x0d,  .speakers = {   0,   RC,  RR,  RL,   0,  LFE,  FR,  FL } },
+{ .ca_index = 0x0e,  .speakers = {   0,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
+{ .ca_index = 0x10,  .speakers = { RRC,  RLC,  RR,  RL,   0,    0,  FR,  FL } },
+{ .ca_index = 0x11,  .speakers = { RRC,  RLC,  RR,  RL,   0,  LFE,  FR,  FL } },
+{ .ca_index = 0x12,  .speakers = { RRC,  RLC,  RR,  RL,  FC,    0,  FR,  FL } },
+{ .ca_index = 0x14,  .speakers = { FRC,  FLC,   0,   0,   0,    0,  FR,  FL } },
+{ .ca_index = 0x15,  .speakers = { FRC,  FLC,   0,   0,   0,  LFE,  FR,  FL } },
+{ .ca_index = 0x16,  .speakers = { FRC,  FLC,   0,   0,  FC,    0,  FR,  FL } },
+{ .ca_index = 0x17,  .speakers = { FRC,  FLC,   0,   0,  FC,  LFE,  FR,  FL } },
+{ .ca_index = 0x18,  .speakers = { FRC,  FLC,   0,  RC,   0,    0,  FR,  FL } },
+{ .ca_index = 0x19,  .speakers = { FRC,  FLC,   0,  RC,   0,  LFE,  FR,  FL } },
+{ .ca_index = 0x1a,  .speakers = { FRC,  FLC,   0,  RC,  FC,    0,  FR,  FL } },
+{ .ca_index = 0x1b,  .speakers = { FRC,  FLC,   0,  RC,  FC,  LFE,  FR,  FL } },
+{ .ca_index = 0x1c,  .speakers = { FRC,  FLC,  RR,  RL,   0,    0,  FR,  FL } },
+{ .ca_index = 0x1d,  .speakers = { FRC,  FLC,  RR,  RL,   0,  LFE,  FR,  FL } },
+{ .ca_index = 0x1e,  .speakers = { FRC,  FLC,  RR,  RL,  FC,    0,  FR,  FL } },
+{ .ca_index = 0x1f,  .speakers = { FRC,  FLC,  RR,  RL,  FC,  LFE,  FR,  FL } },
+};
+
+static struct channel_map_table map_tables[] = {
+	{ SNDRV_CHMAP_FL,       0x00,   FL },
+	{ SNDRV_CHMAP_FR,       0x01,   FR },
+	{ SNDRV_CHMAP_RL,       0x04,   RL },
+	{ SNDRV_CHMAP_RR,       0x05,   RR },
+	{ SNDRV_CHMAP_LFE,      0x02,   LFE },
+	{ SNDRV_CHMAP_FC,       0x03,   FC },
+	{ SNDRV_CHMAP_RLC,      0x06,   RLC },
+	{ SNDRV_CHMAP_RRC,      0x07,   RRC },
+	{} /* terminator */
+};
+
+/* hardware capability structure */
+static const struct snd_pcm_hardware snd_intel_hadstream = {
+	.info =	(SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_DOUBLE |
+		SNDRV_PCM_INFO_MMAP|
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_BATCH),
+	.formats = (SNDRV_PCM_FMTBIT_S24 |
+		SNDRV_PCM_FMTBIT_U24),
+	.rates = SNDRV_PCM_RATE_32000 |
+		SNDRV_PCM_RATE_44100 |
+		SNDRV_PCM_RATE_48000 |
+		SNDRV_PCM_RATE_88200 |
+		SNDRV_PCM_RATE_96000 |
+		SNDRV_PCM_RATE_176400 |
+		SNDRV_PCM_RATE_192000,
+	.rate_min = HAD_MIN_RATE,
+	.rate_max = HAD_MAX_RATE,
+	.channels_min = HAD_MIN_CHANNEL,
+	.channels_max = HAD_MAX_CHANNEL,
+	.buffer_bytes_max = HAD_MAX_BUFFER,
+	.period_bytes_min = HAD_MIN_PERIOD_BYTES,
+	.period_bytes_max = HAD_MAX_PERIOD_BYTES,
+	.periods_min = HAD_MIN_PERIODS,
+	.periods_max = HAD_MAX_PERIODS,
+	.fifo_size = HAD_FIFO_SIZE,
+};
+
+/* Register access functions */
+
+inline int had_get_hwstate(struct snd_intelhad *intelhaddata)
+{
+	/* Check for device presence -SW state */
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+		pr_debug("%s:Device not connected:%d\n", __func__,
+				intelhaddata->drv_status);
+		return -ENODEV;
+	}
+
+	/* Check for device presence -HW state */
+	if (!ospm_power_is_hw_on(OSPM_DISPLAY_ISLAND)) {
+		pr_err("%s:Device not connected\n", __func__);
+		/* HOT_UNPLUG event can be sent to
+		 * maintain correct state within HAD
+		 * had_event_handler(HAD_EVENT_HOT_UNPLUG, intelhaddata);
+		 * Drop all acuired locks before executing this.
+		 */
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+inline int had_get_caps(enum had_caps_list query, void *caps)
+{
+	int retval;
+	struct snd_intelhad *intelhaddata = had_data;
+
+	retval = had_get_hwstate(intelhaddata);
+	if (!retval)
+		retval = intelhaddata->query_ops.hdmi_audio_get_caps(query,
+				caps);
+
+	return retval;
+}
+
+inline int had_set_caps(enum had_caps_list set_element, void *caps)
+{
+	int retval;
+	struct snd_intelhad *intelhaddata = had_data;
+
+	retval = had_get_hwstate(intelhaddata);
+	if (!retval)
+		retval = intelhaddata->query_ops.hdmi_audio_set_caps(
+				set_element, caps);
+
+	return retval;
+}
+
+inline int had_read_register(uint32_t offset, uint32_t *data)
+{
+	int retval;
+	struct snd_intelhad *intelhaddata = had_data;
+	u32 base_addr = intelhaddata->audio_reg_base;
+
+	retval = had_get_hwstate(intelhaddata);
+	if (!retval)
+		retval = intelhaddata->reg_ops.hdmi_audio_read_register(
+				base_addr + offset, data);
+
+	return retval;
+}
+
+inline int had_write_register(uint32_t offset, uint32_t data)
+{
+	int retval;
+	struct snd_intelhad *intelhaddata = had_data;
+	u32 base_addr = intelhaddata->audio_reg_base;
+
+	retval = had_get_hwstate(intelhaddata);
+	if (!retval)
+		retval = intelhaddata->reg_ops.hdmi_audio_write_register(
+				base_addr + offset, data);
+
+	return retval;
+}
+
+inline int had_read_modify(uint32_t offset, uint32_t data, uint32_t mask)
+{
+	int retval;
+	struct snd_intelhad *intelhaddata = had_data;
+	u32 base_addr = intelhaddata->audio_reg_base;
+
+	retval = had_get_hwstate(intelhaddata);
+	if (!retval)
+		retval = intelhaddata->reg_ops.hdmi_audio_read_modify(
+				base_addr + offset, data, mask);
+
+	return retval;
+}
+/**
+ * had_read_modify_aud_config_v2 - Specific function to read-modify AUD_CONFIG
+ * register on VLV2.The had_read_modify() function should not directly be used
+ * on VLV2 for updating AUD_CONFIG register.
+ * This is because:
+ * Bit6 of AUD_CONFIG register is writeonly due to a silicon bug on VLV2 HDMI IP.
+ * As a result a read-modify of AUD_CONFIG regiter will always clear bit6.
+ * AUD_CONFIG[6:4] represents the "channels" field of the register.
+ * This field should be 1xy binary for configuration with 6 or more channels.
+ * Read-modify of AUD_CONFIG (Eg. for enabling audio) causes the "channels" field
+ * to be updated as 0xy binary resulting in bad audio.
+ * The fix is to always write the AUD_CONFIG[6:4] with appropriate value when
+ * doing read-modify of AUD_CONFIG register.
+ *
+ * @substream: the current substream or NULL if no active substream
+ * @data : data to be written
+ * @mask : mask
+ *
+ */
+inline int had_read_modify_aud_config_v2(struct snd_pcm_substream *substream,
+					uint32_t data, uint32_t mask)
+{
+	union aud_cfg cfg_val = {.cfg_regval = 0};
+	u8 channels;
+
+	/*
+	 * If substream is NULL, there is no active stream.
+	 * In this case just set channels to 2
+	 */
+	if (substream)
+		channels = substream->runtime->channels;
+	else
+		channels = 2;
+	cfg_val.cfg_regx_v2.num_ch = channels - 2;
+
+	data = data | cfg_val.cfg_regval;
+	mask = mask | AUD_CONFIG_CH_MASK_V2;
+
+	pr_debug("%s : data = %x, mask =%x\n", __func__, data, mask);
+
+	return had_read_modify(AUD_CONFIG, data, mask);
+}
+
+/**
+ * snd_intelhad_enable_audio_v1 - to enable audio
+ *
+ * @substream: Current substream or NULL if no active substream.
+ * @enable: 1 if audio is to be enabled; 0 if audio is to be disabled.
+ *
+ */
+static void snd_intelhad_enable_audio_v1(struct snd_pcm_substream *substream,
+					u8 enable)
+{
+	had_read_modify(AUD_CONFIG, enable, BIT(0));
+}
+
+/**
+ * snd_intelhad_enable_audio_v2 - to enable audio
+ *
+ * @substream: Current substream or NULL if no active substream.
+ * @enable: 1 if audio is to be enabled; 0 if audio is to be disabled.
+ */
+static void snd_intelhad_enable_audio_v2(struct snd_pcm_substream *substream,
+					u8 enable)
+{
+	had_read_modify_aud_config_v2(substream, enable, BIT(0));
+}
+
+/**
+ * snd_intelhad_reset_audio_v1 - to reset audio subsystem
+ *
+ * @reset: 1 to reset audio; 0 to bring audio out of reset.
+ *
+ */
+static void snd_intelhad_reset_audio_v1(u8 reset)
+{
+	had_write_register(AUD_HDMI_STATUS, reset);
+}
+
+/**
+ * snd_intelhad_reset_audio_v2 - to reset audio subsystem
+ *
+ * @reset: 1 to reset audio; 0 to bring audio out of reset.
+ *
+ */
+static void snd_intelhad_reset_audio_v2(u8 reset)
+{
+	had_write_register(AUD_HDMI_STATUS_v2, reset);
+}
+
+/**
+ * had_prog_status_reg - to initialize audio channel status registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+static int had_prog_status_reg(struct snd_pcm_substream *substream,
+			struct snd_intelhad *intelhaddata)
+{
+	union aud_ch_status_0 ch_stat0 = {.status_0_regval = 0};
+	union aud_ch_status_1 ch_stat1 = {.status_1_regval = 0};
+	int format;
+
+	pr_debug("Entry %s\n", __func__);
+
+	ch_stat0.status_0_regx.lpcm_id = (intelhaddata->aes_bits &
+						IEC958_AES0_NONAUDIO)>>1;
+	ch_stat0.status_0_regx.clk_acc = (intelhaddata->aes_bits &
+						IEC958_AES3_CON_CLOCK)>>4;
+	switch (substream->runtime->rate) {
+	case AUD_SAMPLE_RATE_32:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_32KHZ;
+		break;
+
+	case AUD_SAMPLE_RATE_44_1:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_44KHZ;
+		break;
+	case AUD_SAMPLE_RATE_48:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_48KHZ;
+		break;
+	case AUD_SAMPLE_RATE_88_2:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_88KHZ;
+		break;
+	case AUD_SAMPLE_RATE_96:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_96KHZ;
+		break;
+	case AUD_SAMPLE_RATE_176_4:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_176KHZ;
+		break;
+	case AUD_SAMPLE_RATE_192:
+		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_192KHZ;
+		break;
+
+	default:
+		/* control should never come here */
+		return -EINVAL;
+	break;
+
+	}
+	had_write_register(AUD_CH_STATUS_0, ch_stat0.status_0_regval);
+
+	format = substream->runtime->format;
+
+	if (format == SNDRV_PCM_FORMAT_S16_LE) {
+		ch_stat1.status_1_regx.max_wrd_len = MAX_SMPL_WIDTH_20;
+		ch_stat1.status_1_regx.wrd_len = SMPL_WIDTH_16BITS;
+	} else if (format == SNDRV_PCM_FORMAT_S24_LE) {
+		ch_stat1.status_1_regx.max_wrd_len = MAX_SMPL_WIDTH_24;
+		ch_stat1.status_1_regx.wrd_len = SMPL_WIDTH_24BITS;
+	} else {
+		ch_stat1.status_1_regx.max_wrd_len = 0;
+		ch_stat1.status_1_regx.wrd_len = 0;
+	}
+	had_write_register(AUD_CH_STATUS_1, ch_stat1.status_1_regval);
+	return 0;
+}
+
+/**
+ * snd_intelhad_prog_audio_ctrl_v2 - to initialize audio
+ * registers and buffer confgiuration registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+int snd_intelhad_prog_audio_ctrl_v2(struct snd_pcm_substream *substream,
+					struct snd_intelhad *intelhaddata)
+{
+	union aud_cfg cfg_val = {.cfg_regval = 0};
+	union aud_buf_config buf_cfg = {.buf_cfgval = 0};
+	u8 channels;
+
+	had_prog_status_reg(substream, intelhaddata);
+
+	buf_cfg.buf_cfg_regx_v2.audio_fifo_watermark = FIFO_THRESHOLD;
+	buf_cfg.buf_cfg_regx_v2.dma_fifo_watermark = DMA_FIFO_THRESHOLD;
+	buf_cfg.buf_cfg_regx_v2.aud_delay = 0;
+	had_write_register(AUD_BUF_CONFIG, buf_cfg.buf_cfgval);
+
+	channels = substream->runtime->channels;
+	cfg_val.cfg_regx_v2.num_ch = channels - 2;
+	if (channels <= 2)
+		cfg_val.cfg_regx_v2.layout = LAYOUT0;
+	else
+		cfg_val.cfg_regx_v2.layout = LAYOUT1;
+
+	cfg_val.cfg_regx_v2.val_bit = 1;
+	had_write_register(AUD_CONFIG, cfg_val.cfg_regval);
+	return 0;
+}
+
+/**
+ * snd_intelhad_prog_audio_ctrl_v1 - to initialize audio
+ * registers and buffer confgiuration registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+int snd_intelhad_prog_audio_ctrl_v1(struct snd_pcm_substream *substream,
+					struct snd_intelhad *intelhaddata)
+{
+	union aud_cfg cfg_val = {.cfg_regval = 0};
+	union aud_buf_config buf_cfg = {.buf_cfgval = 0};
+	u8 channels;
+
+	had_prog_status_reg(substream, intelhaddata);
+
+	buf_cfg.buf_cfg_regx.fifo_width = FIFO_THRESHOLD;
+	buf_cfg.buf_cfg_regx.aud_delay = 0;
+	had_write_register(AUD_BUF_CONFIG, buf_cfg.buf_cfgval);
+
+	channels = substream->runtime->channels;
+
+	switch (channels) {
+	case 1:
+	case 2:
+		cfg_val.cfg_regx.num_ch = CH_STEREO;
+		cfg_val.cfg_regx.layout = LAYOUT0;
+	break;
+
+	case 3:
+	case 4:
+		cfg_val.cfg_regx.num_ch = CH_THREE_FOUR;
+		cfg_val.cfg_regx.layout = LAYOUT1;
+	break;
+
+	case 5:
+	case 6:
+		cfg_val.cfg_regx.num_ch = CH_FIVE_SIX;
+		cfg_val.cfg_regx.layout = LAYOUT1;
+	break;
+
+	case 7:
+	case 8:
+		cfg_val.cfg_regx.num_ch = CH_SEVEN_EIGHT;
+		cfg_val.cfg_regx.layout = LAYOUT1;
+	break;
+
+	}
+
+	cfg_val.cfg_regx.val_bit = 1;
+	had_write_register(AUD_CONFIG, cfg_val.cfg_regval);
+	return 0;
+}
+/*
+ * Compute derived values in channel_allocations[].
+ */
+static void init_channel_allocations(void)
+{
+	int i, j;
+	struct cea_channel_speaker_allocation *p;
+
+	pr_debug("%s: Enter\n", __func__);
+
+	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+		p = channel_allocations + i;
+		p->channels = 0;
+		p->spk_mask = 0;
+		for (j = 0; j < ARRAY_SIZE(p->speakers); j++)
+			if (p->speakers[j]) {
+				p->channels++;
+				p->spk_mask |= p->speakers[j];
+			}
+	}
+}
+
+/*
+ * The transformation takes two steps:
+ *
+ *      eld->spk_alloc => (eld_speaker_allocation_bits[]) => spk_mask
+ *            spk_mask => (channel_allocations[])         => ai->CA
+ *
+ * TODO: it could select the wrong CA from multiple candidates.
+*/
+static int snd_intelhad_channel_allocation(struct snd_intelhad *intelhaddata,
+					int channels)
+{
+	int i;
+	int ca = 0;
+	int spk_mask = 0;
+
+	/*
+	* CA defaults to 0 for basic stereo audio
+	*/
+	if (channels <= 2)
+		return 0;
+
+	/*
+	* expand ELD's speaker allocation mask
+	*
+	* ELD tells the speaker mask in a compact(paired) form,
+	* expand ELD's notions to match the ones used by Audio InfoFrame.
+	*/
+
+	for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
+		if (intelhaddata->eeld.speaker_allocation_block & (1 << i))
+			spk_mask |= eld_speaker_allocation_bits[i];
+	}
+
+	/* search for the first working match in the CA table */
+	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+		if (channels == channel_allocations[i].channels &&
+		(spk_mask & channel_allocations[i].spk_mask) ==
+				channel_allocations[i].spk_mask) {
+			ca = channel_allocations[i].ca_index;
+			break;
+		}
+	}
+
+	pr_debug("HDMI: select CA 0x%x for %d\n", ca, channels);
+
+	return ca;
+}
+
+/* from speaker bit mask to ALSA API channel position */
+static int spk_to_chmap(int spk)
+{
+	struct channel_map_table *t = map_tables;
+
+	for (; t->map; t++) {
+		if (t->spk_mask == spk)
+			return t->map;
+	}
+	return 0;
+}
+
+void had_build_channel_allocation_map(struct snd_intelhad *intelhaddata)
+{
+	int i = 0, c = 0;
+	int spk_mask = 0;
+	struct snd_pcm_chmap_elem *chmap;
+	uint8_t eld_high, eld_high_mask = 0xF0;
+	uint8_t high_msb;
+
+	chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
+	if (chmap == NULL) {
+		pr_err("kzalloc returned null in %s\n", __func__);
+		intelhaddata->chmap->chmap = NULL;
+		return;
+	}
+
+	had_get_caps(HAD_GET_ELD, &intelhaddata->eeld);
+
+	pr_debug("eeld.speaker_allocation_block = %x\n",
+			intelhaddata->eeld.speaker_allocation_block);
+
+	/* WA: Fix the max channel supported to 8 */
+
+	/*
+	 * Sink may support more than 8 channels, if eld_high has more than
+	 * one bit set. SOC supports max 8 channels.
+	 * Refer eld_speaker_allocation_bits, for sink speaker allocation
+	 */
+
+	/* if 0x2F < eld < 0x4F fall back to 0x2f, else fall back to 0x4F */
+	eld_high = intelhaddata->eeld.speaker_allocation_block & eld_high_mask;
+	if ((eld_high & (eld_high-1)) && (eld_high > 0x1F)) {
+		/* eld_high & (eld_high-1): if more than 1 bit set */
+		/* 0x1F: 7 channels */
+		for (i = 1; i < 4; i++) {
+			high_msb = eld_high & (0x80 >> i);
+			if (high_msb) {
+				intelhaddata->eeld.speaker_allocation_block &=
+					high_msb | 0xF;
+				break;
+			}
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
+		if (intelhaddata->eeld.speaker_allocation_block & (1 << i))
+			spk_mask |= eld_speaker_allocation_bits[i];
+	}
+
+	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+		if (spk_mask == channel_allocations[i].spk_mask) {
+			for (c = 0; c < channel_allocations[i].channels; c++) {
+				chmap->map[c] = spk_to_chmap(
+					channel_allocations[i].speakers[(MAX_SPEAKERS - 1)-c]);
+			}
+			chmap->channels = channel_allocations[i].channels;
+			intelhaddata->chmap->chmap = chmap;
+			break;
+		}
+	}
+	if (i >= ARRAY_SIZE(channel_allocations))
+		kfree(chmap);
+}
+
+/*
+ ** ALSA API channel-map control callbacks
+ **/
+static int had_chmap_ctl_info(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_info *uinfo)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct snd_intelhad *intelhaddata = info->private_data;
+
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED)
+		return -ENODEV;
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = HAD_MAX_CHANNEL;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = SNDRV_CHMAP_LAST;
+	return 0;
+}
+
+#ifndef USE_ALSA_DEFAULT_TLV
+static int had_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
+				unsigned int size, unsigned int __user *tlv)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct snd_intelhad *intelhaddata = info->private_data;
+
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED)
+		return -ENODEV;
+
+	/* TODO: Fix for query channel map */
+	return -EPERM;
+}
+#endif
+
+static int had_chmap_ctl_get(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct snd_intelhad *intelhaddata = info->private_data;
+	int i = 0;
+	const struct snd_pcm_chmap_elem *chmap;
+
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED)
+		return -ENODEV;
+	if (intelhaddata->chmap->chmap ==  NULL)
+		return -ENODATA;
+	chmap = intelhaddata->chmap->chmap;
+	for (i = 0; i < chmap->channels; i++) {
+		ucontrol->value.integer.value[i] = chmap->map[i];
+		pr_debug("chmap->map[%d] = %d\n", i, chmap->map[i]);
+	}
+
+	return 0;
+}
+
+static int had_chmap_ctl_put(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	/* TODO: Get channel map and set swap register */
+	return -EPERM;
+}
+
+static int had_register_chmap_ctls(struct snd_intelhad *intelhaddata,
+						struct snd_pcm *pcm)
+{
+	int err = 0;
+
+	err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+			NULL, 0, (unsigned long)intelhaddata,
+			&intelhaddata->chmap);
+	if (err < 0)
+		return err;
+
+	intelhaddata->chmap->private_data = intelhaddata;
+	intelhaddata->kctl = intelhaddata->chmap->kctl;
+	intelhaddata->kctl->info = had_chmap_ctl_info;
+	intelhaddata->kctl->get = had_chmap_ctl_get;
+	intelhaddata->kctl->put = had_chmap_ctl_put;
+#ifndef USE_ALSA_DEFAULT_TLV
+	intelhaddata->kctl->tlv.c = had_chmap_ctl_tlv;
+#endif
+	intelhaddata->chmap->chmap = NULL;
+	return 0;
+}
+
+/**
+ * snd_intelhad_prog_dip_v1 - to initialize Data Island Packets registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+static void snd_intelhad_prog_dip_v1(struct snd_pcm_substream *substream,
+				struct snd_intelhad *intelhaddata)
+{
+	int i;
+	union aud_ctrl_st ctrl_state = {.ctrl_val = 0};
+	union aud_info_frame2 frame2 = {.fr2_val = 0};
+	union aud_info_frame3 frame3 = {.fr3_val = 0};
+	u8 checksum = 0;
+	int channels;
+
+	channels = substream->runtime->channels;
+
+	had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+
+	frame2.fr2_regx.chnl_cnt = substream->runtime->channels - 1;
+
+	frame3.fr3_regx.chnl_alloc = snd_intelhad_channel_allocation(
+					intelhaddata, channels);
+
+	/*Calculte the byte wide checksum for all valid DIP words*/
+	for (i = 0; i < BYTES_PER_WORD; i++)
+		checksum += (INFO_FRAME_WORD1 >> i*BITS_PER_BYTE) & MASK_BYTE0;
+	for (i = 0; i < BYTES_PER_WORD; i++)
+		checksum += (frame2.fr2_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+	for (i = 0; i < BYTES_PER_WORD; i++)
+		checksum += (frame3.fr3_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+
+	frame2.fr2_regx.chksum = -(checksum);
+
+	had_write_register(AUD_HDMIW_INFOFR, INFO_FRAME_WORD1);
+	had_write_register(AUD_HDMIW_INFOFR, frame2.fr2_val);
+	had_write_register(AUD_HDMIW_INFOFR, frame3.fr3_val);
+
+	/* program remaining DIP words with zero */
+	for (i = 0; i < HAD_MAX_DIP_WORDS-VALID_DIP_WORDS; i++)
+		had_write_register(AUD_HDMIW_INFOFR, 0x0);
+
+	ctrl_state.ctrl_regx.dip_freq = 1;
+	ctrl_state.ctrl_regx.dip_en_sta = 1;
+	had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+}
+
+/**
+ * snd_intelhad_prog_dip_v2 - to initialize Data Island Packets registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+static void snd_intelhad_prog_dip_v2(struct snd_pcm_substream *substream,
+				struct snd_intelhad *intelhaddata)
+{
+	int i;
+	union aud_ctrl_st ctrl_state = {.ctrl_val = 0};
+	union aud_info_frame2 frame2 = {.fr2_val = 0};
+	union aud_info_frame3 frame3 = {.fr3_val = 0};
+	u8 checksum = 0;
+	int channels;
+
+	channels = substream->runtime->channels;
+
+	had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+
+	frame2.fr2_regx.chnl_cnt = substream->runtime->channels - 1;
+
+	frame3.fr3_regx.chnl_alloc = snd_intelhad_channel_allocation(
+					intelhaddata, channels);
+
+	/*Calculte the byte wide checksum for all valid DIP words*/
+	for (i = 0; i < BYTES_PER_WORD; i++)
+		checksum += (INFO_FRAME_WORD1 >> i*BITS_PER_BYTE) & MASK_BYTE0;
+	for (i = 0; i < BYTES_PER_WORD; i++)
+		checksum += (frame2.fr2_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+	for (i = 0; i < BYTES_PER_WORD; i++)
+		checksum += (frame3.fr3_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+
+	frame2.fr2_regx.chksum = -(checksum);
+
+	had_write_register(AUD_HDMIW_INFOFR_v2, INFO_FRAME_WORD1);
+	had_write_register(AUD_HDMIW_INFOFR_v2, frame2.fr2_val);
+	had_write_register(AUD_HDMIW_INFOFR_v2, frame3.fr3_val);
+
+	/* program remaining DIP words with zero */
+	for (i = 0; i < HAD_MAX_DIP_WORDS-VALID_DIP_WORDS; i++)
+		had_write_register(AUD_HDMIW_INFOFR_v2, 0x0);
+
+	ctrl_state.ctrl_regx.dip_freq = 1;
+	ctrl_state.ctrl_regx.dip_en_sta = 1;
+	had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+}
+
+/**
+ * snd_intelhad_prog_buffer - programs buffer
+ * address and length registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function programs ring buffer address and length into registers.
+ */
+int snd_intelhad_prog_buffer(struct snd_intelhad *intelhaddata,
+					int start, int end)
+{
+	u32 ring_buf_addr, ring_buf_size, period_bytes;
+	u8 i, num_periods;
+	struct snd_pcm_substream *substream;
+
+	substream = intelhaddata->stream_info.had_substream;
+	if (!substream) {
+		pr_err("substream is NULL\n");
+		dump_stack();
+		return 0;
+	}
+
+	ring_buf_addr = substream->runtime->dma_addr;
+	ring_buf_size = snd_pcm_lib_buffer_bytes(substream);
+	intelhaddata->stream_info.ring_buf_size = ring_buf_size;
+	period_bytes = frames_to_bytes(substream->runtime,
+				substream->runtime->period_size);
+	num_periods = substream->runtime->periods;
+
+	/*
+	 * buffer addr should  be 64 byte aligned, period bytes
+	 * will be used to calculate addr offset
+	 */
+	period_bytes &= ~0x3F;
+
+	/* Hardware supports MAX_PERIODS buffers */
+	if (end >= HAD_MAX_PERIODS)
+		return -EINVAL;
+
+	for (i = start; i <= end; i++) {
+		/* Program the buf registers with addr and len */
+		intelhaddata->buf_info[i].buf_addr = ring_buf_addr +
+							 (i * period_bytes);
+		if (i < num_periods-1)
+			intelhaddata->buf_info[i].buf_size = period_bytes;
+		else
+			intelhaddata->buf_info[i].buf_size = ring_buf_size -
+							(period_bytes*i);
+
+		had_write_register(AUD_BUF_A_ADDR + (i * HAD_REG_WIDTH),
+					intelhaddata->buf_info[i].buf_addr |
+					BIT(0) | BIT(1));
+		had_write_register(AUD_BUF_A_LENGTH + (i * HAD_REG_WIDTH),
+					period_bytes);
+		intelhaddata->buf_info[i].is_valid = true;
+	}
+	pr_debug("%s:buf[%d-%d] addr=%#x  and size=%d\n", __func__, start, end,
+			intelhaddata->buf_info[start].buf_addr,
+			intelhaddata->buf_info[start].buf_size);
+	intelhaddata->valid_buf_cnt = num_periods;
+	return 0;
+}
+
+inline int snd_intelhad_read_len(struct snd_intelhad *intelhaddata)
+{
+	int i, retval = 0;
+	u32 len[4];
+
+	for (i = 0; i < 4 ; i++) {
+		had_read_register(AUD_BUF_A_LENGTH + (i * HAD_REG_WIDTH),
+					&len[i]);
+		if (!len[i])
+			retval++;
+	}
+	if (retval != 1) {
+		for (i = 0; i < 4 ; i++)
+			pr_debug("buf[%d] size=%d\n", i, len[i]);
+	}
+
+	return retval;
+}
+
+/**
+ * snd_intelhad_prog_cts_v1 - Program HDMI audio CTS value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @tmds: sampling frequency of the display data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * Program CTS register based on the audio and display sampling frequency
+ */
+static void snd_intelhad_prog_cts_v1(u32 aud_samp_freq, u32 tmds, u32 n_param,
+				struct snd_intelhad *intelhaddata)
+{
+	u32 cts_val;
+	u64 dividend, divisor;
+
+	/* Calculate CTS according to HDMI 1.3a spec*/
+	dividend = (u64)tmds * n_param*1000;
+	divisor = 128 * aud_samp_freq;
+	cts_val = div64_u64(dividend, divisor);
+	pr_debug("TMDS value=%d, N value=%d, CTS Value=%d\n",
+			tmds, n_param, cts_val);
+	had_write_register(AUD_HDMI_CTS, (BIT(20) | cts_val));
+}
+
+/**
+ * snd_intelhad_prog_cts_v2 - Program HDMI audio CTS value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @tmds: sampling frequency of the display data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * Program CTS register based on the audio and display sampling frequency
+ */
+static void snd_intelhad_prog_cts_v2(u32 aud_samp_freq, u32 tmds, u32 n_param,
+				struct snd_intelhad *intelhaddata)
+{
+	u32 cts_val;
+	u64 dividend, divisor;
+
+	/* Calculate CTS according to HDMI 1.3a spec*/
+	dividend = (u64)tmds * n_param*1000;
+	divisor = 128 * aud_samp_freq;
+	cts_val = div64_u64(dividend, divisor);
+	pr_debug("TMDS value=%d, N value=%d, CTS Value=%d\n",
+			tmds, n_param, cts_val);
+	had_write_register(AUD_HDMI_CTS, (BIT(24) | cts_val));
+}
+
+static int had_calculate_n_value(u32 aud_samp_freq)
+{
+	s32 n_val;
+
+	/* Select N according to HDMI 1.3a spec*/
+	switch (aud_samp_freq) {
+	case AUD_SAMPLE_RATE_32:
+		n_val = 4096;
+	break;
+
+	case AUD_SAMPLE_RATE_44_1:
+		n_val = 6272;
+	break;
+
+	case AUD_SAMPLE_RATE_48:
+		n_val = 6144;
+	break;
+
+	case AUD_SAMPLE_RATE_88_2:
+		n_val = 12544;
+	break;
+
+	case AUD_SAMPLE_RATE_96:
+		n_val = 12288;
+	break;
+
+	case AUD_SAMPLE_RATE_176_4:
+		n_val = 25088;
+	break;
+
+	case HAD_MAX_RATE:
+		n_val = 24576;
+	break;
+
+	default:
+		n_val = -EINVAL;
+	break;
+	}
+	return n_val;
+}
+
+/**
+ * snd_intelhad_prog_n_v1 - Program HDMI audio N value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback.
+ * It programs based on the audio and display sampling frequency
+ */
+static int snd_intelhad_prog_n_v1(u32 aud_samp_freq, u32 *n_param,
+				struct snd_intelhad *intelhaddata)
+{
+	s32 n_val;
+
+	n_val =	had_calculate_n_value(aud_samp_freq);
+
+	if (n_val < 0)
+		return n_val;
+
+	had_write_register(AUD_N_ENABLE, (BIT(20) | n_val));
+	*n_param = n_val;
+	return 0;
+}
+
+/**
+ * snd_intelhad_prog_n_v2 - Program HDMI audio N value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback.
+ * It programs based on the audio and display sampling frequency
+ */
+static int snd_intelhad_prog_n_v2(u32 aud_samp_freq, u32 *n_param,
+				struct snd_intelhad *intelhaddata)
+{
+	s32 n_val;
+
+	n_val =	had_calculate_n_value(aud_samp_freq);
+
+	if (n_val < 0)
+		return n_val;
+
+	had_write_register(AUD_N_ENABLE, (BIT(24) | n_val));
+	*n_param = n_val;
+	return 0;
+}
+
+static void had_clear_underrun_intr_v1(struct snd_intelhad *intelhaddata)
+{
+	u32 hdmi_status, i = 0;
+
+	/* Handle Underrun interrupt within Audio Unit */
+	had_write_register(AUD_CONFIG, 0);
+	/* Reset buffer pointers */
+	had_write_register(AUD_HDMI_STATUS, 1);
+	had_write_register(AUD_HDMI_STATUS, 0);
+	/**
+	 * The interrupt status 'sticky' bits might not be cleared by
+	 * setting '1' to that bit once...
+	 */
+	do { /* clear bit30, 31 AUD_HDMI_STATUS */
+		had_read_register(AUD_HDMI_STATUS, &hdmi_status);
+		pr_debug("HDMI status =0x%x\n", hdmi_status);
+		if (hdmi_status & AUD_CONFIG_MASK_UNDERRUN) {
+			i++;
+			hdmi_status &= (AUD_CONFIG_MASK_SRDBG |
+					AUD_CONFIG_MASK_FUNCRST);
+			hdmi_status |= ~AUD_CONFIG_MASK_UNDERRUN;
+			had_write_register(AUD_HDMI_STATUS, hdmi_status);
+		} else
+			break;
+	} while (i < MAX_CNT);
+	if (i >= MAX_CNT)
+		pr_err("Unable to clear UNDERRUN bits\n");
+}
+
+static void had_clear_underrun_intr_v2(struct snd_intelhad *intelhaddata)
+{
+	u32 hdmi_status, i = 0;
+
+	/* Handle Underrun interrupt within Audio Unit */
+	had_write_register(AUD_CONFIG, 0);
+	/* Reset buffer pointers */
+	had_write_register(AUD_HDMI_STATUS_v2, 1);
+	had_write_register(AUD_HDMI_STATUS_v2, 0);
+	/**
+	 * The interrupt status 'sticky' bits might not be cleared by
+	 * setting '1' to that bit once...
+	 */
+	do { /* clear bit30, 31 AUD_HDMI_STATUS */
+		had_read_register(AUD_HDMI_STATUS_v2, &hdmi_status);
+		pr_debug("HDMI status =0x%x\n", hdmi_status);
+		if (hdmi_status & AUD_CONFIG_MASK_UNDERRUN) {
+			i++;
+			hdmi_status &= ~AUD_CONFIG_MASK_UNDERRUN;
+			had_write_register(AUD_HDMI_STATUS_v2, hdmi_status);
+		} else
+			break;
+	} while (i < MAX_CNT);
+	if (i >= MAX_CNT)
+		pr_err("Unable to clear UNDERRUN bits\n");
+}
+
+/**
+* snd_intelhad_open - stream initializations are done here
+* @substream:substream for which the stream function is called
+*
+* This function is called whenever a PCM stream is opened
+*/
+static int snd_intelhad_open(struct snd_pcm_substream *substream)
+{
+	struct snd_intelhad *intelhaddata;
+	struct snd_pcm_runtime *runtime;
+	struct had_stream_pvt *stream;
+	struct had_pvt_data *had_stream;
+	int retval;
+
+	pr_debug("snd_intelhad_open called\n");
+	intelhaddata = snd_pcm_substream_chip(substream);
+	had_stream = intelhaddata->private_data;
+	runtime = substream->runtime;
+
+	pm_runtime_get(intelhaddata->dev);
+
+	/*
+	 * HDMI driver might suspend the device already,
+	 * so we return it on
+	 */
+	if (!ospm_power_using_hw_begin(OSPM_DISPLAY_ISLAND,
+			OSPM_UHB_FORCE_POWER_ON)) {
+		pr_err("HDMI device can't be turned on\n");
+		retval = -ENODEV;
+		goto exit_put_handle;
+	}
+
+	if (had_get_hwstate(intelhaddata)) {
+		pr_err("%s: HDMI cable plugged-out\n", __func__);
+		retval = -ENODEV;
+		goto exit_ospm_handle;
+	}
+
+	/* Check, if device already in use */
+	if (runtime->private_data) {
+		pr_err("Device already in use\n");
+		retval = -EBUSY;
+		goto exit_ospm_handle;
+	}
+
+	/* set the runtime hw parameter with local snd_pcm_hardware struct */
+	runtime->hw = snd_intel_hadstream;
+
+	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+	if (!stream) {
+		retval = -ENOMEM;
+		goto exit_ospm_handle;
+	}
+	stream->stream_status = STREAM_INIT;
+	runtime->private_data = stream;
+
+	retval = snd_pcm_hw_constraint_integer(runtime,
+			 SNDRV_PCM_HW_PARAM_PERIODS);
+	if (retval < 0) {
+		goto exit_err;
+	}
+
+	/* Make sure, that the period size is always aligned
+	 * 64byte boundary
+	 */
+	retval = snd_pcm_hw_constraint_step(substream->runtime, 0,
+			SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64);
+	if (retval < 0) {
+		pr_err("%s:step_size=64 failed,err=%d\n", __func__, retval);
+		goto exit_err;
+	}
+
+	return retval;
+exit_err:
+	kfree(stream);
+exit_ospm_handle:
+	ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND);
+exit_put_handle:
+	pm_runtime_put(intelhaddata->dev);
+	runtime->private_data = NULL;
+	return retval;
+}
+
+/**
+* had_period_elapsed - updates the hardware pointer status
+* @had_substream:substream for which the stream function is called
+*
+*/
+static void had_period_elapsed(void *had_substream)
+{
+	struct snd_pcm_substream *substream = had_substream;
+	struct had_stream_pvt *stream;
+
+	/* pr_debug("had_period_elapsed called\n"); */
+
+	if (!substream || !substream->runtime)
+		return;
+	stream = substream->runtime->private_data;
+	if (!stream)
+		return;
+
+	if (stream->stream_status != STREAM_RUNNING)
+		return;
+	snd_pcm_period_elapsed(substream);
+}
+
+/**
+* snd_intelhad_init_stream - internal function to initialize stream info
+* @substream:substream for which the stream function is called
+*
+*/
+static int snd_intelhad_init_stream(struct snd_pcm_substream *substream)
+{
+	struct snd_intelhad *intelhaddata = snd_pcm_substream_chip(substream);
+
+	pr_debug("snd_intelhad_init_stream called\n");
+
+	pr_debug("setting buffer ptr param\n");
+	intelhaddata->stream_info.period_elapsed = had_period_elapsed;
+	intelhaddata->stream_info.had_substream = substream;
+	intelhaddata->stream_info.buffer_ptr = 0;
+	intelhaddata->stream_info.buffer_rendered = 0;
+	intelhaddata->stream_info.sfreq = substream->runtime->rate;
+	return 0;
+}
+
+/**
+ * snd_intelhad_close- to free parameteres when stream is stopped
+ *
+ * @substream:  substream for which the function is called
+ *
+ * This function is called by ALSA framework when stream is stopped
+ */
+static int snd_intelhad_close(struct snd_pcm_substream *substream)
+{
+	struct snd_intelhad *intelhaddata;
+	struct snd_pcm_runtime *runtime;
+
+	pr_debug("snd_intelhad_close called\n");
+
+	intelhaddata = snd_pcm_substream_chip(substream);
+	runtime = substream->runtime;
+
+	if (!runtime->private_data) {
+		pr_debug("close() might have called after failed open");
+		return 0;
+	}
+
+	intelhaddata->stream_info.buffer_rendered = 0;
+	intelhaddata->stream_info.buffer_ptr = 0;
+	intelhaddata->stream_info.str_id = 0;
+	intelhaddata->stream_info.had_substream = NULL;
+
+	/* Check if following drv_status modification is required - VA */
+	if (intelhaddata->drv_status != HAD_DRV_DISCONNECTED)
+		intelhaddata->drv_status = HAD_DRV_CONNECTED;
+	kfree(runtime->private_data);
+	runtime->private_data = NULL;
+	ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND);
+	pm_runtime_put(intelhaddata->dev);
+	return 0;
+}
+
+/**
+ * snd_intelhad_hw_params- to setup the hardware parameters
+ * like allocating the buffers
+ *
+ * @substream:  substream for which the function is called
+ * @hw_params: hardware parameters
+ *
+ * This function is called by ALSA framework when hardware params are set
+ */
+static int snd_intelhad_hw_params(struct snd_pcm_substream *substream,
+				    struct snd_pcm_hw_params *hw_params)
+{
+	unsigned long addr;
+	int pages, buf_size, retval;
+
+	pr_debug("snd_intelhad_hw_params called\n");
+
+	BUG_ON(!hw_params);
+
+	buf_size = params_buffer_bytes(hw_params);
+	retval = snd_pcm_lib_malloc_pages(substream, buf_size);
+	if (retval < 0)
+		return retval;
+	pr_debug("%s:allocated memory = %d\n", __func__, buf_size);
+	/* mark the pages as uncached region */
+	addr = (unsigned long) substream->runtime->dma_area;
+	pages = (substream->runtime->dma_bytes + PAGE_SIZE - 1) / PAGE_SIZE;
+	retval = set_memory_uc(addr, pages);
+	if (retval) {
+		pr_err("set_memory_uc failed.Error:%d\n", retval);
+		return retval;
+	}
+	memset(substream->runtime->dma_area, 0, buf_size);
+
+	return retval;
+}
+
+/**
+ * snd_intelhad_hw_free- to release the resources allocated during
+ * hardware params setup
+ *
+ * @substream:  substream for which the function is called
+ *
+ * This function is called by ALSA framework before close callback.
+ *
+ */
+static int snd_intelhad_hw_free(struct snd_pcm_substream *substream)
+{
+	unsigned long addr;
+	u32 pages;
+
+	pr_debug("snd_intelhad_hw_free called\n");
+
+	/* mark back the pages as cached/writeback region before the free */
+	if (substream->runtime->dma_area != NULL) {
+		addr = (unsigned long) substream->runtime->dma_area;
+		pages = (substream->runtime->dma_bytes + PAGE_SIZE - 1) /
+								PAGE_SIZE;
+		set_memory_wb(addr, pages);
+		return snd_pcm_lib_free_pages(substream);
+	}
+	return 0;
+}
+
+/**
+* snd_intelhad_pcm_trigger - stream activities are handled here
+* @substream:substream for which the stream function is called
+* @cmd:the stream commamd thats requested from upper layer
+* This function is called whenever an a stream activity is invoked
+*/
+static int snd_intelhad_pcm_trigger(struct snd_pcm_substream *substream,
+					int cmd)
+{
+	int caps, retval = 0;
+	unsigned long flag_irq;
+	struct snd_intelhad *intelhaddata;
+	struct had_stream_pvt *stream;
+	struct had_pvt_data *had_stream;
+
+	pr_debug("snd_intelhad_pcm_trigger called\n");
+
+	intelhaddata = snd_pcm_substream_chip(substream);
+	stream = substream->runtime->private_data;
+	had_stream = intelhaddata->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		pr_debug("Trigger Start\n");
+
+		/* Disable local INTRs till register prgmng is done */
+		if (had_get_hwstate(intelhaddata)) {
+			pr_err("_START: HDMI cable plugged-out\n");
+			retval = -ENODEV;
+			break;
+		}
+		stream->stream_status = STREAM_RUNNING;
+
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irq);
+		had_stream->stream_type = HAD_RUNNING_STREAM;
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irq);
+
+		/* Enable Audio */
+		/*
+		 * ToDo: Need to enable UNDERRUN interrupts as well
+		 *   caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+		 */
+		caps = HDMI_AUDIO_BUFFER_DONE;
+		retval = had_set_caps(HAD_SET_ENABLE_AUDIO_INT, &caps);
+		retval = had_set_caps(HAD_SET_ENABLE_AUDIO, NULL);
+		intelhaddata->ops->enable_audio(substream, 1);
+
+		pr_debug("Processed _Start\n");
+
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+		pr_debug("Trigger Stop\n");
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irq);
+		intelhaddata->stream_info.str_id = 0;
+		intelhaddata->curr_buf = 0;
+
+		/* Stop reporting BUFFER_DONE/UNDERRUN to above layers*/
+
+		had_stream->stream_type = HAD_INIT;
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irq);
+		/* Disable Audio */
+		/*
+		 * ToDo: Need to disable UNDERRUN interrupts as well
+		 *   caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+		 */
+		caps = HDMI_AUDIO_BUFFER_DONE;
+		had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+		intelhaddata->ops->enable_audio(substream, 0);
+		/* Reset buffer pointers */
+		intelhaddata->ops->reset_audio(1);
+		intelhaddata->ops->reset_audio(0);
+		stream->stream_status = STREAM_DROPPED;
+		had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+		break;
+
+	default:
+		retval = -EINVAL;
+	}
+	return retval;
+}
+
+/**
+* snd_intelhad_pcm_prepare- internal preparation before starting a stream
+*
+* @substream:  substream for which the function is called
+*
+* This function is called when a stream is started for internal preparation.
+*/
+static int snd_intelhad_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	int retval;
+	u32 disp_samp_freq, n_param;
+	struct snd_intelhad *intelhaddata;
+	struct snd_pcm_runtime *runtime;
+	struct had_pvt_data *had_stream;
+
+	pr_debug("snd_intelhad_pcm_prepare called\n");
+
+	intelhaddata = snd_pcm_substream_chip(substream);
+	runtime = substream->runtime;
+	had_stream = intelhaddata->private_data;
+
+	if (had_get_hwstate(intelhaddata)) {
+		pr_err("%s: HDMI cable plugged-out\n", __func__);
+		snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
+		retval = -ENODEV;
+		goto prep_end;
+	}
+
+	pr_debug("period_size=%d\n",
+				frames_to_bytes(runtime, runtime->period_size));
+	pr_debug("periods=%d\n", runtime->periods);
+	pr_debug("buffer_size=%d\n", snd_pcm_lib_buffer_bytes(substream));
+	pr_debug("rate=%d\n", runtime->rate);
+	pr_debug("channels=%d\n", runtime->channels);
+
+	if (intelhaddata->stream_info.str_id) {
+		pr_debug("_prepare is called for existing str_id#%d\n",
+					intelhaddata->stream_info.str_id);
+		retval = snd_intelhad_pcm_trigger(substream,
+						SNDRV_PCM_TRIGGER_STOP);
+		return retval;
+	}
+
+	retval = snd_intelhad_init_stream(substream);
+	if (retval)
+		goto prep_end;
+
+
+	/* Get N value in KHz */
+	retval = had_get_caps(HAD_GET_SAMPLING_FREQ, &disp_samp_freq);
+	if (retval) {
+		pr_err("querying display sampling freq failed %#x\n", retval);
+		goto prep_end;
+	}
+
+	had_get_caps(HAD_GET_ELD, &intelhaddata->eeld);
+
+	retval = intelhaddata->ops->prog_n(substream->runtime->rate, &n_param,
+								intelhaddata);
+	if (retval) {
+		pr_err("programming N value failed %#x\n", retval);
+		goto prep_end;
+	}
+	intelhaddata->ops->prog_cts(substream->runtime->rate,
+					disp_samp_freq, n_param, intelhaddata);
+
+	intelhaddata->ops->prog_dip(substream, intelhaddata);
+
+	retval = intelhaddata->ops->audio_ctrl(substream, intelhaddata);
+
+	/* Prog buffer address */
+	retval = snd_intelhad_prog_buffer(intelhaddata,
+			HAD_BUF_TYPE_A, HAD_BUF_TYPE_D);
+
+	/*
+	 * Program channel mapping in following order:
+	 * FL, FR, C, LFE, RL, RR
+	 */
+
+	had_write_register(AUD_BUF_CH_SWAP, SWAP_LFE_CENTER);
+
+prep_end:
+	return retval;
+}
+
+/**
+ * snd_intelhad_pcm_pointer- to send the current buffer pointerprocessed by hw
+ *
+ * @substream:  substream for which the function is called
+ *
+ * This function is called by ALSA framework to get the current hw buffer ptr
+ * when a period is elapsed
+ */
+static snd_pcm_uframes_t snd_intelhad_pcm_pointer(
+					struct snd_pcm_substream *substream)
+{
+	struct snd_intelhad *intelhaddata;
+	u32 bytes_rendered = 0;
+
+	/* pr_debug("snd_intelhad_pcm_pointer called\n"); */
+
+	intelhaddata = snd_pcm_substream_chip(substream);
+
+	if (intelhaddata->flag_underrun) {
+		intelhaddata->flag_underrun = 0;
+		return SNDRV_PCM_POS_XRUN;
+	}
+
+	if (intelhaddata->stream_info.buffer_rendered)
+		div_u64_rem(intelhaddata->stream_info.buffer_rendered,
+			intelhaddata->stream_info.ring_buf_size,
+			&(bytes_rendered));
+
+	intelhaddata->stream_info.buffer_ptr = bytes_to_frames(
+						substream->runtime,
+						bytes_rendered);
+	return intelhaddata->stream_info.buffer_ptr;
+}
+
+/**
+* snd_intelhad_pcm_mmap- mmaps a kernel buffer to user space for copying data
+*
+* @substream:  substream for which the function is called
+* @vma:		struct instance of memory VMM memory area
+*
+* This function is called by OS when a user space component
+* tries to get mmap memory from driver
+*/
+static int snd_intelhad_pcm_mmap(struct snd_pcm_substream *substream,
+	struct vm_area_struct *vma)
+{
+
+	pr_debug("snd_intelhad_pcm_mmap called\n");
+
+	pr_debug("entry with prot:%s\n", __func__);
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+	return remap_pfn_range(vma, vma->vm_start,
+			substream->dma_buffer.addr >> PAGE_SHIFT,
+			vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+int hdmi_audio_mode_change(struct snd_pcm_substream *substream)
+{
+	int retval = 0;
+	u32 disp_samp_freq, n_param;
+	struct snd_intelhad *intelhaddata;
+
+	intelhaddata = snd_pcm_substream_chip(substream);
+
+	/* Disable Audio */
+	intelhaddata->ops->enable_audio(substream, 0);
+
+	/* Update CTS value */
+	retval = had_get_caps(HAD_GET_SAMPLING_FREQ, &disp_samp_freq);
+	if (retval) {
+		pr_err("querying display sampling freq failed %#x\n", retval);
+		goto out;
+	}
+
+	retval = intelhaddata->ops->prog_n(substream->runtime->rate, &n_param,
+								intelhaddata);
+	if (retval) {
+		pr_err("programming N value failed %#x\n", retval);
+		goto out;
+	}
+	intelhaddata->ops->prog_cts(substream->runtime->rate,
+					disp_samp_freq, n_param, intelhaddata);
+
+	/* Enable Audio */
+	intelhaddata->ops->enable_audio(substream, 1);
+
+out:
+	return retval;
+}
+
+/*PCM operations structure and the calls back for the same */
+struct snd_pcm_ops snd_intelhad_playback_ops = {
+	.open =		snd_intelhad_open,
+	.close =	snd_intelhad_close,
+	.ioctl =	snd_pcm_lib_ioctl,
+	.hw_params =	snd_intelhad_hw_params,
+	.hw_free =	snd_intelhad_hw_free,
+	.prepare =	snd_intelhad_pcm_prepare,
+	.trigger =	snd_intelhad_pcm_trigger,
+	.pointer =	snd_intelhad_pcm_pointer,
+	.mmap =	snd_intelhad_pcm_mmap,
+};
+
+/**
+ * snd_intelhad_create - to crete alsa card instance
+ *
+ * @intelhaddata: pointer to internal context
+ * @card: pointer to card
+ *
+ * This function is called when the hdmi cable is plugged in
+ */
+static int snd_intelhad_create(
+		struct snd_intelhad *intelhaddata,
+		struct snd_card *card)
+{
+	int retval;
+	static struct snd_device_ops ops = {
+	};
+
+	BUG_ON(!intelhaddata);
+	/* ALSA api to register the device */
+	retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, intelhaddata, &ops);
+	return retval;
+}
+/**
+ * snd_intelhad_pcm_free - to free the memory allocated
+ *
+ * @pcm: pointer to pcm instance
+ * This function is called when the device is removed
+ */
+static void snd_intelhad_pcm_free(struct snd_pcm *pcm)
+{
+	pr_debug("Freeing PCM preallocated pages\n");
+	snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static int had_iec958_info(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+	uinfo->count = 1;
+	return 0;
+}
+
+static int had_iec958_get(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol);
+
+	ucontrol->value.iec958.status[0] = (intelhaddata->aes_bits >> 0) & 0xff;
+	ucontrol->value.iec958.status[1] = (intelhaddata->aes_bits >> 8) & 0xff;
+	ucontrol->value.iec958.status[2] =
+					(intelhaddata->aes_bits >> 16) & 0xff;
+	ucontrol->value.iec958.status[3] =
+					(intelhaddata->aes_bits >> 24) & 0xff;
+	return 0;
+}
+static int had_iec958_mask_get(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.iec958.status[0] = 0xff;
+	ucontrol->value.iec958.status[1] = 0xff;
+	ucontrol->value.iec958.status[2] = 0xff;
+	ucontrol->value.iec958.status[3] = 0xff;
+	return 0;
+}
+static int had_iec958_put(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_value *ucontrol)
+{
+	unsigned int val;
+	struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol);
+
+	pr_debug("entered had_iec958_put\n");
+	val = (ucontrol->value.iec958.status[0] << 0) |
+		(ucontrol->value.iec958.status[1] << 8) |
+		(ucontrol->value.iec958.status[2] << 16) |
+		(ucontrol->value.iec958.status[3] << 24);
+	if (intelhaddata->aes_bits != val) {
+		intelhaddata->aes_bits = val;
+		return 1;
+	}
+	return 1;
+}
+
+static struct snd_kcontrol_new had_control_iec958_mask = {
+	.access =   SNDRV_CTL_ELEM_ACCESS_READ,
+	.iface =    SNDRV_CTL_ELEM_IFACE_PCM,
+	.name =     SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
+	.info =     had_iec958_info, /* shared */
+	.get =      had_iec958_mask_get,
+};
+
+static struct snd_kcontrol_new had_control_iec958 = {
+	.iface =    SNDRV_CTL_ELEM_IFACE_PCM,
+	.name =         SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+	.info =         had_iec958_info,
+	.get =          had_iec958_get,
+	.put =          had_iec958_put
+};
+
+static struct snd_intel_had_interface had_interface = {
+	.name =         "hdmi-audio",
+	.query =        hdmi_audio_query,
+	.suspend =      hdmi_audio_suspend,
+	.resume =       hdmi_audio_resume,
+};
+
+static struct had_ops had_ops_v1 = {
+	.enable_audio = snd_intelhad_enable_audio_v1,
+	.reset_audio = snd_intelhad_reset_audio_v1,
+	.prog_n =	snd_intelhad_prog_n_v1,
+	.prog_cts =	snd_intelhad_prog_cts_v1,
+	.audio_ctrl =	snd_intelhad_prog_audio_ctrl_v1,
+	.prog_dip =	snd_intelhad_prog_dip_v1,
+	.handle_underrun =  had_clear_underrun_intr_v1,
+};
+
+static struct had_ops had_ops_v2 = {
+	.enable_audio = snd_intelhad_enable_audio_v2,
+	.reset_audio = snd_intelhad_reset_audio_v2,
+	.prog_n =	snd_intelhad_prog_n_v2,
+	.prog_cts =	snd_intelhad_prog_cts_v2,
+	.audio_ctrl =	snd_intelhad_prog_audio_ctrl_v2,
+	.prog_dip =	snd_intelhad_prog_dip_v2,
+	.handle_underrun = had_clear_underrun_intr_v2,
+};
+/**
+ * hdmi_audio_probe - to create sound card instance for HDMI audio playabck
+ *
+ *@haddata: pointer to HAD private data
+ *@card_id: card for which probe is called
+ *
+ * This function is called when the hdmi cable is plugged in. This function
+ * creates and registers the sound card with ALSA
+ */
+static int hdmi_audio_probe(struct platform_device *devptr)
+{
+
+	int retval;
+	struct snd_pcm *pcm;
+	struct snd_card *card;
+	struct had_callback_ops ops_cb;
+	struct snd_intelhad *intelhaddata;
+	struct had_pvt_data *had_stream;
+
+	pr_debug("Enter %s\n", __func__);
+
+	pr_debug("hdmi_audio_probe dma_mask: %d\n", devptr->dev.dma_mask);
+
+	/* allocate memory for saving internal context and working */
+	intelhaddata = kzalloc(sizeof(*intelhaddata), GFP_KERNEL);
+	if (!intelhaddata) {
+		pr_err("mem alloc failed\n");
+		return -ENOMEM;
+	}
+
+	had_stream = kzalloc(sizeof(*had_stream), GFP_KERNEL);
+	if (!had_stream) {
+		pr_err("mem alloc failed\n");
+		retval = -ENOMEM;
+		goto free_haddata;
+	}
+
+	had_data = intelhaddata;
+	ops_cb.intel_had_event_call_back = had_event_handler;
+
+	/* registering with display driver to get access to display APIs */
+
+	retval = mid_hdmi_audio_setup(
+			ops_cb.intel_had_event_call_back,
+			&(intelhaddata->reg_ops),
+			&(intelhaddata->query_ops));
+	if (retval) {
+		pr_err("querying display driver APIs failed %#x\n", retval);
+		goto free_hadstream;
+	}
+	mutex_lock(&had_mutex);
+	spin_lock_init(&intelhaddata->had_spinlock);
+	intelhaddata->drv_status = HAD_DRV_DISCONNECTED;
+	/* create a card instance with ALSA framework */
+	retval = snd_card_new(&devptr->dev, hdmi_card_index, hdmi_card_id,
+				THIS_MODULE, 0, &card);
+
+	if (retval)
+		goto unlock_mutex;
+	intelhaddata->card = card;
+	intelhaddata->card_id = hdmi_card_id;
+	intelhaddata->card_index = card->number;
+	intelhaddata->private_data = had_stream;
+	intelhaddata->flag_underrun = 0;
+	intelhaddata->aes_bits = SNDRV_PCM_DEFAULT_CON_SPDIF;
+	strncpy(card->driver, INTEL_HAD, strlen(INTEL_HAD));
+	strncpy(card->shortname, INTEL_HAD, strlen(INTEL_HAD));
+
+	retval = snd_pcm_new(card, INTEL_HAD, PCM_INDEX, MAX_PB_STREAMS,
+						MAX_CAP_STREAMS, &pcm);
+	if (retval)
+		goto err;
+
+	/* setup private data which can be retrieved when required */
+	pcm->private_data = intelhaddata;
+	pcm->private_free = snd_intelhad_pcm_free;
+	pcm->info_flags = 0;
+	strncpy(pcm->name, card->shortname, strlen(card->shortname));
+	/* setup the ops for palyabck */
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+			    &snd_intelhad_playback_ops);
+	/* allocate dma pages for ALSA stream operations
+	 * memory allocated is based on size, not max value
+	 * thus using same argument for max & size
+	 */
+	retval = snd_pcm_lib_preallocate_pages_for_all(pcm,
+			SNDRV_DMA_TYPE_DEV, NULL,
+			HAD_MAX_BUFFER, HAD_MAX_BUFFER);
+
+	if (card->dev == NULL)
+		pr_debug("card->dev is NULL!!!!! Should not be this case\n");
+	else if (card->dev->dma_mask == NULL)
+		pr_debug("hdmi_audio_probe dma_mask is NULL!!!!!\n");
+	else
+		pr_debug("hdmi_audio_probe dma_mask is : %d\n", card->dev->dma_mask);
+
+	if (retval)
+		goto err;
+
+	/* internal function call to register device with ALSA */
+	retval = snd_intelhad_create(intelhaddata, card);
+	if (retval)
+		goto err;
+
+	card->private_data = &intelhaddata;
+	retval = snd_card_register(card);
+	if (retval)
+		goto err;
+
+	/* IEC958 controls */
+	retval = snd_ctl_add(card, snd_ctl_new1(&had_control_iec958_mask,
+						intelhaddata));
+	if (retval < 0)
+		goto err;
+	retval = snd_ctl_add(card, snd_ctl_new1(&had_control_iec958,
+						intelhaddata));
+	if (retval < 0)
+		goto err;
+
+	init_channel_allocations();
+
+	/* Register channel map controls */
+	retval = had_register_chmap_ctls(intelhaddata, pcm);
+	if (retval < 0)
+		goto err;
+
+	intelhaddata->dev = &devptr->dev;
+	pm_runtime_set_active(intelhaddata->dev);
+	pm_runtime_enable(intelhaddata->dev);
+
+	mutex_unlock(&had_mutex);
+	retval = mid_hdmi_audio_register(&had_interface, intelhaddata);
+	if (retval) {
+		pr_err("registering with display driver failed %#x\n", retval);
+		snd_card_free(card);
+		goto free_hadstream;
+	}
+
+	intelhaddata->hw_silence = 1;
+	intelhaddata->ops = &had_ops_v2;
+
+	return retval;
+err:
+	snd_card_free(card);
+unlock_mutex:
+	mutex_unlock(&had_mutex);
+free_hadstream:
+	kfree(had_stream);
+	pm_runtime_disable(intelhaddata->dev);
+	intelhaddata->dev = NULL;
+free_haddata:
+	kfree(intelhaddata);
+	intelhaddata = NULL;
+	pr_err("Error returned from %s api %#x\n", __func__, retval);
+	return retval;
+}
+
+/**
+ * hdmi_audio_remove - removes the alsa card
+ *
+ *@haddata: pointer to HAD private data
+ *
+ * This function is called when the hdmi cable is un-plugged. This function
+ * free the sound card.
+ */
+static int hdmi_audio_remove(struct platform_device *devptr)
+{
+	struct snd_intelhad *intelhaddata = had_data;
+	int caps;
+
+	pr_debug("Enter %s\n", __func__);
+
+	if (!intelhaddata)
+		return 0;
+
+	if (intelhaddata->drv_status != HAD_DRV_DISCONNECTED) {
+		caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+		had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+		had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+	}
+	snd_card_free(intelhaddata->card);
+	kfree(intelhaddata->private_data);
+	kfree(intelhaddata);
+	return 0;
+}
+
+static int had_pm_runtime_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int had_pm_runtime_resume(struct device *dev)
+{
+	return 0;
+}
+
+static int had_pm_runtime_idle(struct device *dev)
+{
+	return pm_schedule_suspend(dev, HAD_SUSPEND_DELAY);
+}
+
+const struct dev_pm_ops had_pm_ops = {
+	.runtime_idle = had_pm_runtime_idle,
+	.runtime_suspend = had_pm_runtime_suspend,
+	.runtime_resume = had_pm_runtime_resume,
+};
+
+static const struct acpi_device_id had_acpi_ids[] = {
+	{ "HAD0F28", 0 },
+	{ "HAD022A8", 0 },
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, had_acpi_ids);
+
+static struct platform_driver had_driver = {
+	.probe =        hdmi_audio_probe,
+	.remove		= hdmi_audio_remove,
+	.suspend =      NULL,
+	.resume =       NULL,
+	.driver		= {
+		.name	= HDMI_AUDIO_DRIVER,
+#ifdef CONFIG_PM
+		.pm	= &had_pm_ops,
+#endif
+		.acpi_match_table = ACPI_PTR(had_acpi_ids),
+	},
+};
+
+/*
+* alsa_card_intelhad_init- driver init function
+* This function is called when driver module is inserted
+*/
+static int __init alsa_card_intelhad_init(void)
+{
+	int retval;
+
+	pr_debug("Enter %s\n", __func__);
+
+	pr_info("******** HAD DRIVER loading.. Ver: %s\n",
+					HAD_DRIVER_VERSION);
+
+	retval = platform_driver_register(&had_driver);
+	if (retval < 0) {
+		pr_err("Platform driver register failed\n");
+		return retval;
+	}
+
+	pr_debug("init complete\n");
+	return retval;
+}
+
+/**
+* alsa_card_intelhad_exit- driver exit function
+* This function is called when driver module is removed
+*/
+static void __exit alsa_card_intelhad_exit(void)
+{
+	pr_debug("had_exit called\n");
+	platform_driver_unregister(&had_driver);
+}
+late_initcall(alsa_card_intelhad_init);
+module_exit(alsa_card_intelhad_exit);
diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio.h b/sound/hdmi_audio/intel_mid_hdmi_audio.h
new file mode 100644
index 0000000..7c54b97
--- /dev/null
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio.h
@@ -0,0 +1,740 @@
+/*
+ *   intel_mid_hdmi_audio.h - Intel HDMI audio driver for MID
+ *
+ *  Copyright (C) 2010 Intel Corp
+ *  Authors:	Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>
+ *		Ramesh Babu K V	<ramesh.babu@intel.com>
+ *		Vaibhav Agarwal <vaibhav.agarwal@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * ALSA driver for Intel MID HDMI audio controller
+ */
+#ifndef __INTEL_MID_HDMI_AUDIO_H
+#define __INTEL_MID_HDMI_AUDIO_H
+
+#include <linux/types.h>
+#include <sound/initval.h>
+#include <linux/version.h>
+#include <linux/pm_runtime.h>
+#include <sound/asoundef.h>
+#include <sound/control.h>
+#include <sound/pcm.h>
+#include <hdmi_audio_if.h>
+
+#define OSPM_DISPLAY_ISLAND	0x40
+
+typedef enum _UHBUsage {
+	OSPM_UHB_ONLY_IF_ON = 0,
+	OSPM_UHB_FORCE_POWER_ON,
+} UHBUsage;
+
+bool ospm_power_using_hw_begin(int hw_island, UHBUsage usage);
+void ospm_power_using_hw_end(int hw_island);
+
+/*
+ * Use this function to do an instantaneous check for if the hw is on.
+ * Only use this in cases where you know the g_state_change_mutex
+ * is already held such as in irq install/uninstall and you need to
+ * prevent a deadlock situation.  Otherwise use ospm_power_using_hw_begin().
+ */
+bool ospm_power_is_hw_on(int hw_islands);
+
+#define HAD_DRIVER_VERSION	"0.01.003"
+#define HAD_MAX_DEVICES		1
+#define HAD_MIN_CHANNEL		2
+#define HAD_MAX_CHANNEL		8
+#define HAD_NUM_OF_RING_BUFS	4
+
+/* Assume 192KHz, 8channel, 25msec period */
+#define HAD_MAX_BUFFER		(600*1024)
+#define HAD_MIN_BUFFER		(32*1024)
+#define HAD_MAX_PERIODS		4
+#define HAD_MIN_PERIODS		4
+#define HAD_MAX_PERIOD_BYTES	(HAD_MAX_BUFFER/HAD_MIN_PERIODS)
+#define HAD_MIN_PERIOD_BYTES	256
+#define HAD_FIFO_SIZE		0 /* fifo not being used */
+#define MAX_SPEAKERS		8
+/* TODO: Add own tlv when channel map is ported for user space */
+#define USE_ALSA_DEFAULT_TLV
+
+#define AUD_SAMPLE_RATE_32	32000
+#define AUD_SAMPLE_RATE_44_1	44100
+#define AUD_SAMPLE_RATE_48	48000
+#define AUD_SAMPLE_RATE_88_2	88200
+#define AUD_SAMPLE_RATE_96	96000
+#define AUD_SAMPLE_RATE_176_4	176400
+#define AUD_SAMPLE_RATE_192	192000
+
+#define HAD_MIN_RATE		AUD_SAMPLE_RATE_32
+#define HAD_MAX_RATE		AUD_SAMPLE_RATE_192
+
+#define DRIVER_NAME		"intelmid_hdmi_audio"
+#define DIS_SAMPLE_RATE_25_2	25200
+#define DIS_SAMPLE_RATE_27	27000
+#define DIS_SAMPLE_RATE_54	54000
+#define DIS_SAMPLE_RATE_74_25	74250
+#define DIS_SAMPLE_RATE_148_5	148500
+#define HAD_REG_WIDTH		0x08
+#define HAD_MAX_HW_BUFS		0x04
+#define HAD_MAX_DIP_WORDS		16
+#define INTEL_HAD		"IntelHDMI"
+
+/* _AUD_CONFIG register MASK */
+#define AUD_CONFIG_MASK_UNDERRUN	0xC0000000
+#define AUD_CONFIG_MASK_SRDBG		0x00000002
+#define AUD_CONFIG_MASK_FUNCRST		0x00000001
+
+#define MAX_CNT			0xFF
+#define HAD_SUSPEND_DELAY	1000
+
+#define OTM_HDMI_ELD_SIZE 84
+
+typedef union {
+	uint8_t eld_data[OTM_HDMI_ELD_SIZE];
+	#pragma pack(1)
+	struct {
+		/* Byte[0] = ELD Version Number */
+		union {
+			uint8_t   byte0;
+			struct {
+				uint8_t reserved:3; /* Reserf */
+				uint8_t eld_ver:5; /* ELD Version Number */
+						/* 00000b - reserved
+						 * 00001b - first rev, obsoleted
+						 * 00010b - version 2, supporting CEA version 861D or below
+						 * 00011b:11111b - reserved
+						 * for future
+						 */
+			};
+		};
+
+		/* Byte[1] = Vendor Version Field */
+		union {
+			uint8_t vendor_version;
+			struct {
+				uint8_t reserved1:3;
+				uint8_t veld_ver:5; /* Version number of the ELD
+						     * extension. This value is
+						     * provisioned and unique to
+						     * each vendor.
+						     */
+			};
+		};
+
+		/* Byte[2] = Baseline Length field */
+		uint8_t baseline_eld_length; /* Length of the Baseline structure
+					      *	divided by Four.
+					      */
+
+		/* Byte [3] = Reserved for future use */
+		uint8_t byte3;
+
+		/* Starting of the BaseLine EELD structure
+		 * Byte[4] = Monitor Name Length
+		 */
+		union {
+			uint8_t byte4;
+			struct {
+				uint8_t mnl:5;
+				uint8_t cea_edid_rev_id:3;
+			};
+		};
+
+		/* Byte[5] = Capabilities */
+		union {
+			uint8_t capabilities;
+			struct {
+				uint8_t hdcp:1; /* HDCP support */
+				uint8_t ai_support:1;   /* AI support */
+				uint8_t connection_type:2; /* Connection type
+							    * 00 - HDMI
+							    * 01 - DP
+							    * 10 -11  Reserved
+							    * for future
+							    * connection types
+							    */
+				uint8_t sadc:4; /* Indicates number of 3 bytes
+						 * Short Audio Descriptors.
+						 */
+			};
+		};
+
+		/* Byte[6] = Audio Synch Delay */
+		uint8_t audio_synch_delay; /* Amount of time reported by the
+					    * sink that the video trails audio
+					    * in milliseconds.
+					    */
+
+		/* Byte[7] = Speaker Allocation Block */
+		union {
+			uint8_t speaker_allocation_block;
+			struct {
+				uint8_t flr:1; /*Front Left and Right channels*/
+				uint8_t lfe:1; /*Low Frequency Effect channel*/
+				uint8_t fc:1;  /*Center transmission channel*/
+				uint8_t rlr:1; /*Rear Left and Right channels*/
+				uint8_t rc:1; /*Rear Center channel*/
+				uint8_t flrc:1; /*Front left and Right of Center
+						 *transmission channels
+						 */
+				uint8_t rlrc:1; /*Rear left and Right of Center
+						 *transmission channels
+						 */
+				uint8_t reserved3:1; /* Reserved */
+			};
+		};
+
+		/* Byte[8 - 15] - 8 Byte port identification value */
+		uint8_t port_id_value[8];
+
+		/* Byte[16 - 17] - 2 Byte Manufacturer ID */
+		uint8_t manufacturer_id[2];
+
+		/* Byte[18 - 19] - 2 Byte Product ID */
+		uint8_t product_id[2];
+
+		/* Byte [20-83] - 64 Bytes of BaseLine Data */
+		uint8_t mn_sand_sads[64]; /* This will include
+					   * - ASCII string of Monitor name
+					   * - List of 3 byte SADs
+					   * - Zero padding
+					   */
+
+		/* Vendor ELD Block should continue here!
+		 * No Vendor ELD block defined as of now.
+		 */
+	};
+	#pragma pack()
+} otm_hdmi_eld_t;
+
+/**
+ * enum had_status - Audio stream states
+ *
+ * @STREAM_INIT: Stream initialized
+ * @STREAM_RUNNING: Stream running
+ * @STREAM_PAUSED: Stream paused
+ * @STREAM_DROPPED: Stream dropped
+ */
+enum had_stream_status {
+	STREAM_INIT = 0,
+	STREAM_RUNNING = 1,
+	STREAM_PAUSED = 2,
+	STREAM_DROPPED = 3
+};
+
+/**
+ * enum had_status_stream - HAD stream states
+ */
+enum had_status_stream {
+	HAD_INIT = 0,
+	HAD_RUNNING_STREAM,
+};
+
+enum had_drv_status {
+	HAD_DRV_CONNECTED,
+	HAD_DRV_RUNNING,
+	HAD_DRV_DISCONNECTED,
+	HAD_DRV_SUSPENDED,
+	HAD_DRV_ERR,
+};
+
+/* enum intel_had_aud_buf_type - HDMI controller ring buffer types */
+enum intel_had_aud_buf_type {
+	HAD_BUF_TYPE_A = 0,
+	HAD_BUF_TYPE_B = 1,
+	HAD_BUF_TYPE_C = 2,
+	HAD_BUF_TYPE_D = 3,
+};
+
+enum num_aud_ch {
+	CH_STEREO = 0,
+	CH_THREE_FOUR = 1,
+	CH_FIVE_SIX = 2,
+	CH_SEVEN_EIGHT = 3
+};
+
+
+/* HDMI controller register offsets */
+enum hdmi_ctrl_reg_offset_v1 {
+	AUD_CONFIG		= 0x0,
+	AUD_CH_STATUS_0		= 0x08,
+	AUD_CH_STATUS_1		= 0x0C,
+	AUD_HDMI_CTS		= 0x10,
+	AUD_N_ENABLE		= 0x14,
+	AUD_SAMPLE_RATE		= 0x18,
+	AUD_BUF_CONFIG		= 0x20,
+	AUD_BUF_CH_SWAP		= 0x24,
+	AUD_BUF_A_ADDR		= 0x40,
+	AUD_BUF_A_LENGTH	= 0x44,
+	AUD_BUF_B_ADDR		= 0x48,
+	AUD_BUF_B_LENGTH	= 0x4c,
+	AUD_BUF_C_ADDR		= 0x50,
+	AUD_BUF_C_LENGTH	= 0x54,
+	AUD_BUF_D_ADDR		= 0x58,
+	AUD_BUF_D_LENGTH	= 0x5c,
+	AUD_CNTL_ST		= 0x60,
+	AUD_HDMI_STATUS		= 0x68,
+	AUD_HDMIW_INFOFR	= 0x114,
+};
+
+/*
+ * Delta changes in HDMI controller register offsets
+ * compare to v1 version
+ */
+
+enum hdmi_ctrl_reg_offset_v2 {
+	AUD_HDMI_STATUS_v2	= 0x64,
+	AUD_HDMIW_INFOFR_v2	= 0x68,
+};
+
+/*
+ * CEA speaker placement:
+ *
+ *  FL  FLC   FC   FRC   FR
+ *
+ *                         LFE
+ *
+ *  RL  RLC   RC   RRC   RR
+ *
+ * The Left/Right Surround channel _notions_ LS/RS in SMPTE 320M corresponds to
+ * CEA RL/RR; The SMPTE channel _assignment_ C/LFE is swapped to CEA LFE/FC.
+ */
+enum cea_speaker_placement {
+	FL  = (1 <<  0),        /* Front Left           */
+	FC  = (1 <<  1),        /* Front Center         */
+	FR  = (1 <<  2),        /* Front Right          */
+	FLC = (1 <<  3),        /* Front Left Center    */
+	FRC = (1 <<  4),        /* Front Right Center   */
+	RL  = (1 <<  5),        /* Rear Left            */
+	RC  = (1 <<  6),        /* Rear Center          */
+	RR  = (1 <<  7),        /* Rear Right           */
+	RLC = (1 <<  8),        /* Rear Left Center     */
+	RRC = (1 <<  9),        /* Rear Right Center    */
+	LFE = (1 << 10),        /* Low Frequency Effect */
+};
+
+struct cea_channel_speaker_allocation {
+	int ca_index;
+	int speakers[8];
+
+	/* derived values, just for convenience */
+	int channels;
+	int spk_mask;
+};
+
+struct channel_map_table {
+	unsigned char map;              /* ALSA API channel map position */
+	unsigned char cea_slot;         /* CEA slot value */
+	int spk_mask;                   /* speaker position bit mask */
+};
+
+/**
+ * union aud_cfg - Audio configuration
+ *
+ * @cfg_regx: individual register bits
+ * @cfg_regval: full register value
+ *
+ */
+union aud_cfg {
+	struct {
+		u32 aud_en:1;
+		u32 layout:1;
+		u32 fmt:2;
+		u32 num_ch:2;
+		u32 rsvd0:1;
+		u32 set:1;
+		u32 flat:1;
+		u32 val_bit:1;
+		u32 user_bit:1;
+		u32 underrun:1;
+		u32 rsvd1:20;
+	} cfg_regx;
+	struct {
+		u32 aud_en:1;
+		u32 layout:1;
+		u32 fmt:2;
+		u32 num_ch:3;
+		u32 set:1;
+		u32 flat:1;
+		u32 val_bit:1;
+		u32 user_bit:1;
+		u32 underrun:1;
+		u32 packet_mode:1;
+		u32 left_align:1;
+		u32 bogus_sample:1;
+		u32 dp_modei:1;
+		u32 rsvd:16;
+	} cfg_regx_v2;
+	u32 cfg_regval;
+};
+
+/**
+ * union aud_ch_status_0 - Audio Channel Status 0 Attributes
+ *
+ * @status_0_regx:individual register bits
+ * @status_0_regval:full register value
+ *
+ */
+union aud_ch_status_0 {
+	struct {
+		u32 ch_status:1;
+		u32 lpcm_id:1;
+		u32 cp_info:1;
+		u32 format:3;
+		u32 mode:2;
+		u32 ctg_code:8;
+		u32 src_num:4;
+		u32 ch_num:4;
+		u32 samp_freq:4;
+		u32 clk_acc:2;
+		u32 rsvd:2;
+	} status_0_regx;
+	u32 status_0_regval;
+};
+
+/**
+ * union aud_ch_status_1 - Audio Channel Status 1 Attributes
+ *
+ * @status_1_regx: individual register bits
+ * @status_1_regval: full register value
+ *
+ */
+union aud_ch_status_1 {
+	struct {
+		u32 max_wrd_len:1;
+		u32 wrd_len:3;
+		u32 rsvd:28;
+		} status_1_regx;
+	u32 status_1_regval;
+};
+
+/**
+ * union aud_hdmi_cts - CTS register
+ *
+ * @cts_regx: individual register bits
+ * @cts_regval: full register value
+ *
+ */
+union aud_hdmi_cts {
+	struct {
+		u32 cts_val:20;
+		u32 en_cts_prog:1;
+		u32 rsvd:11;
+	} cts_regx;
+	struct {
+		u32 cts_val:24;
+		u32 en_cts_prog:1;
+		u32 rsvd:7;
+	} cts_regx_v2;
+	u32 cts_regval;
+};
+
+/**
+ * union aud_hdmi_n_enable - N register
+ *
+ * @n_regx: individual register bits
+ * @n_regval: full register value
+ *
+ */
+union aud_hdmi_n_enable {
+	struct {
+		u32 n_val:20;
+		u32 en_n_prog:1;
+		u32 rsvd:11;
+	} n_regx;
+	struct {
+		u32 n_val:24;
+		u32 en_n_prog:1;
+		u32 rsvd:7;
+	} n_regx_v2;
+	u32 n_regval;
+};
+
+/**
+ * union aud_buf_config -  Audio Buffer configurations
+ *
+ * @buf_cfg_regx: individual register bits
+ * @buf_cfgval: full register value
+ *
+ */
+union aud_buf_config {
+	struct {
+		u32 fifo_width:8;
+		u32 rsvd0:8;
+		u32 aud_delay:8;
+		u32 rsvd1:8;
+	} buf_cfg_regx;
+	struct {
+		u32 audio_fifo_watermark:8;
+		u32 dma_fifo_watermark:3;
+		u32 rsvd0:5;
+		u32 aud_delay:8;
+		u32 rsvd1:8;
+	} buf_cfg_regx_v2;
+	u32 buf_cfgval;
+};
+
+/**
+ * union aud_buf_ch_swap - Audio Sample Swapping offset
+ *
+ * @buf_ch_swap_regx: individual register bits
+ * @buf_ch_swap_val: full register value
+ *
+ */
+union aud_buf_ch_swap {
+	struct {
+		u32 first_0:3;
+		u32 second_0:3;
+		u32 first_1:3;
+		u32 second_1:3;
+		u32 first_2:3;
+		u32 second_2:3;
+		u32 first_3:3;
+		u32 second_3:3;
+		u32 rsvd:8;
+	} buf_ch_swap_regx;
+	u32 buf_ch_swap_val;
+};
+
+/**
+ * union aud_buf_addr - Address for Audio Buffer
+ *
+ * @buf_addr_regx: individual register bits
+ * @buf_addr_val: full register value
+ *
+ */
+union aud_buf_addr {
+	struct {
+		u32 valid:1;
+		u32 intr_en:1;
+		u32 rsvd:4;
+		u32 addr:26;
+	} buf_addr_regx;
+	u32 buf_addr_val;
+};
+
+/**
+ * union aud_buf_len - Length of Audio Buffer
+ *
+ * @buf_len_regx: individual register bits
+ * @buf_len_val: full register value
+ *
+ */
+union aud_buf_len {
+	struct {
+		u32 buf_len:20;
+		u32 rsvd:12;
+	} buf_len_regx;
+	u32 buf_len_val;
+};
+
+/**
+ * union aud_ctrl_st - Audio Control State Register offset
+ *
+ * @ctrl_regx: individual register bits
+ * @ctrl_val: full register value
+ *
+ */
+union aud_ctrl_st {
+	struct {
+		u32 ram_addr:4;
+		u32 eld_ack:1;
+		u32 eld_addr:4;
+		u32 eld_buf_size:5;
+		u32 eld_valid:1;
+		u32 cp_ready:1;
+		u32 dip_freq:2;
+		u32 dip_idx:3;
+		u32 dip_en_sta:4;
+		u32 rsvd:7;
+	} ctrl_regx;
+	u32 ctrl_val;
+};
+
+/**
+ * union aud_info_frame1 - Audio HDMI Widget Data Island Packet offset
+ *
+ * @fr1_regx: individual register bits
+ * @fr1_val: full register value
+ *
+ */
+union aud_info_frame1 {
+	struct {
+		u32 pkt_type:8;
+		u32 ver_num:8;
+		u32 len:5;
+		u32 rsvd:11;
+	} fr1_regx;
+	u32 fr1_val;
+};
+
+/**
+ * union aud_info_frame2 - DIP frame 2
+ *
+ * @fr2_regx: individual register bits
+ * @fr2_val: full register value
+ *
+ */
+union aud_info_frame2 {
+	struct {
+		u32 chksum:8;
+		u32 chnl_cnt:3;
+		u32 rsvd0:1;
+		u32 coding_type:4;
+		u32 smpl_size:2;
+		u32 smpl_freq:3;
+		u32 rsvd1:3;
+		u32 format:8;
+	} fr2_regx;
+	u32 fr2_val;
+};
+
+/**
+ * union aud_info_frame3 - DIP frame 3
+ *
+ * @fr3_regx: individual register bits
+ * @fr3_val: full register value
+ *
+ */
+union aud_info_frame3 {
+	struct {
+		u32 chnl_alloc:8;
+		u32 rsvd0:3;
+		u32 lsv:4;
+		u32 dm_inh:1;
+		u32 rsvd1:16;
+	} fr3_regx;
+	u32 fr3_val;
+};
+
+
+struct pcm_stream_info {
+	int		str_id;
+	void		*had_substream;
+	void		(*period_elapsed)(void *had_substream);
+	u32		buffer_ptr;
+	u64		buffer_rendered;
+	u32		ring_buf_size;
+	int		sfreq;
+};
+
+struct ring_buf_info {
+	uint32_t	buf_addr;
+	uint32_t	buf_size;
+	uint8_t		is_valid;
+};
+
+struct had_stream_pvt {
+	enum had_stream_status		stream_status;
+	int				stream_ops;
+	ssize_t				dbg_cum_bytes;
+};
+
+struct had_pvt_data {
+	enum had_status_stream		stream_type;
+};
+
+struct had_callback_ops {
+	had_event_call_back intel_had_event_call_back;
+};
+
+/**
+ * struct snd_intelhad - intelhad driver structure
+ *
+ * @card: ptr to hold card details
+ * @card_index: sound card index
+ * @card_id: detected sound card id
+ * @reg_ops: register operations to program registers
+ * @query_ops: caps call backs for get/set operations
+ * @drv_status: driver status
+ * @buf_info: ring buffer info
+ * @stream_info: stream information
+ * @eeld: holds EELD info
+ * @curr_buf: pointer to hold current active ring buf
+ * @valid_buf_cnt: ring buffer count for stream
+ * @had_spinlock: driver lock
+ * @aes_bits: IEC958 status bits
+ * @buff_done: id of current buffer done intr
+ * @dev: platoform device handle
+ * @kctl: holds kctl ptrs used for channel map
+ * @chmap: holds channel map info
+ * @audio_reg_base: hdmi audio register base offset
+ * @hw_silence: flag indicates SoC support for HW silence/Keep alive
+ * @ops: holds ops functions based on platform
+ */
+struct snd_intelhad {
+	struct snd_card	*card;
+	int		card_index;
+	char		*card_id;
+	struct hdmi_audio_registers_ops	reg_ops;
+	struct hdmi_audio_query_set_ops	query_ops;
+	enum had_drv_status	drv_status;
+	struct		ring_buf_info buf_info[HAD_NUM_OF_RING_BUFS];
+	struct		pcm_stream_info stream_info;
+	otm_hdmi_eld_t	eeld;
+	enum		intel_had_aud_buf_type curr_buf;
+	int		valid_buf_cnt;
+	unsigned int	aes_bits;
+	int flag_underrun;
+	struct had_pvt_data *private_data;
+	spinlock_t had_spinlock;
+	enum		intel_had_aud_buf_type buff_done;
+	struct device *dev;
+	struct snd_kcontrol *kctl;
+	struct snd_pcm_chmap *chmap;
+	unsigned int	audio_reg_base;
+	bool		hw_silence;
+	struct had_ops	*ops;
+};
+
+struct had_ops {
+	void (*enable_audio)(struct snd_pcm_substream *substream,
+			u8 enable);
+	void (*reset_audio)(u8 reset);
+	int (*prog_n)(u32 aud_samp_freq, u32 *n_param,
+			struct snd_intelhad *intelhaddata);
+	void (*prog_cts)(u32 aud_samp_freq, u32 tmds, u32 n_param,
+			struct snd_intelhad *intelhaddata);
+	int (*audio_ctrl)(struct snd_pcm_substream *substream,
+				struct snd_intelhad *intelhaddata);
+	void (*prog_dip)(struct snd_pcm_substream *substream,
+				struct snd_intelhad *intelhaddata);
+	void (*handle_underrun)(struct snd_intelhad *intelhaddata);
+};
+
+
+int had_event_handler(enum had_event_type event_type, void *data);
+
+int hdmi_audio_query(void *drv_data, hdmi_audio_event_t event);
+int hdmi_audio_suspend(void *drv_data, hdmi_audio_event_t event);
+int hdmi_audio_resume(void *drv_data);
+int hdmi_audio_mode_change(struct snd_pcm_substream *substream);
+extern struct snd_pcm_ops snd_intelhad_playback_ops;
+
+int snd_intelhad_init_audio_ctrl(struct snd_pcm_substream *substream,
+					struct snd_intelhad *intelhaddata,
+					int flag_silence);
+int snd_intelhad_prog_buffer(struct snd_intelhad *intelhaddata,
+					int start, int end);
+int snd_intelhad_invd_buffer(int start, int end);
+inline int snd_intelhad_read_len(struct snd_intelhad *intelhaddata);
+void had_build_channel_allocation_map(struct snd_intelhad *intelhaddata);
+
+/* Register access functions */
+inline int had_get_hwstate(struct snd_intelhad *intelhaddata);
+inline int had_get_caps(enum had_caps_list query_element, void *capabilties);
+inline int had_set_caps(enum had_caps_list set_element, void *capabilties);
+inline int had_read_register(uint32_t reg_addr, uint32_t *data);
+inline int had_write_register(uint32_t reg_addr, uint32_t data);
+inline int had_read_modify(uint32_t reg_addr, uint32_t data, uint32_t mask);
+#endif
diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio_if.c b/sound/hdmi_audio/intel_mid_hdmi_audio_if.c
new file mode 100644
index 0000000..acc407d
--- /dev/null
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio_if.c
@@ -0,0 +1,533 @@
+/*
+ *   intel_mid_hdmi_audio_if.c - Intel HDMI audio driver for MID
+ *
+ *  Copyright (C) 2010 Intel Corp
+ *  Authors:	Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>
+ *		Ramesh Babu K V <ramesh.babu@intel.com>
+ *		Vaibhav Agarwal <vaibhav.agarwal@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * ALSA driver for Intel MID HDMI audio controller.  This file contains
+ * interface functions exposed to HDMI Display driver and code to register
+ * with ALSA framework..
+ */
+
+#define pr_fmt(fmt)		"had: " fmt
+
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <sound/pcm.h>
+#include <sound/core.h>
+#include "intel_mid_hdmi_audio.h"
+
+
+/**
+ * hdmi_audio_query - hdmi audio query function
+ *
+ *@haddata: pointer to HAD private data
+ *@event: audio event for which this method is invoked
+ *
+ * This function is called by client driver to query the
+ * hdmi audio.
+ */
+int hdmi_audio_query(void *haddata, hdmi_audio_event_t event)
+{
+	struct snd_pcm_substream *substream = NULL;
+	struct had_pvt_data *had_stream;
+	unsigned long flag_irqs;
+	struct snd_intelhad *intelhaddata = (struct snd_intelhad *)haddata;
+
+	if (intelhaddata->stream_info.had_substream)
+		substream = intelhaddata->stream_info.had_substream;
+	had_stream = intelhaddata->private_data;
+	switch (event.type) {
+	case HAD_EVENT_QUERY_IS_AUDIO_BUSY:
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+
+		if ((had_stream->stream_type == HAD_RUNNING_STREAM) ||
+			substream) {
+			spin_unlock_irqrestore(&intelhaddata->had_spinlock,
+						flag_irqs);
+			pr_debug("Audio stream active\n");
+			return -EBUSY;
+		}
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+	break;
+
+	case HAD_EVENT_QUERY_IS_AUDIO_SUSPENDED:
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+		if (intelhaddata->drv_status == HAD_DRV_SUSPENDED) {
+			spin_unlock_irqrestore(&intelhaddata->had_spinlock,
+						flag_irqs);
+			pr_debug("Audio is suspended\n");
+			return 1;
+		}
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+	break;
+
+	default:
+		pr_debug("error un-handled event !!\n");
+		return -EINVAL;
+	break;
+
+	}
+
+	return 0;
+}
+
+/**
+ * hdmi_audio_suspend - power management suspend function
+ *
+ *@haddata: pointer to HAD private data
+ *@event: pm event for which this method is invoked
+ *
+ * This function is called by client driver to suspend the
+ * hdmi audio.
+ */
+int hdmi_audio_suspend(void *haddata, hdmi_audio_event_t event)
+{
+	int caps, retval = 0;
+	struct had_pvt_data *had_stream;
+	unsigned long flag_irqs;
+	struct snd_pcm_substream *substream;
+	struct snd_intelhad *intelhaddata = (struct snd_intelhad *)haddata;
+
+	pr_debug("Enter:%s", __func__);
+
+	had_stream = intelhaddata->private_data;
+	substream = intelhaddata->stream_info.had_substream;
+
+	if (intelhaddata->dev->power.runtime_status != RPM_SUSPENDED) {
+		pr_err("audio stream is active\n");
+		return -EAGAIN;
+	}
+
+
+	spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_debug("had not connected\n");
+		return retval;
+	}
+
+	if (intelhaddata->drv_status == HAD_DRV_SUSPENDED) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_debug("had already suspended\n");
+		return retval;
+	}
+
+	intelhaddata->drv_status = HAD_DRV_SUSPENDED;
+	spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+	/*
+	 * ToDo: Need to disable UNDERRUN interrupts as well
+	 *  caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+	 */
+	caps = HDMI_AUDIO_BUFFER_DONE;
+	had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+	had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+	pr_debug("Exit:%s", __func__);
+	return retval;
+}
+
+/**
+ * hdmi_audio_resume - power management resume function
+ *
+ *@haddata: pointer to HAD private data
+ *
+ * This function is called by client driver to resume the
+ * hdmi audio.
+ */
+int hdmi_audio_resume(void *haddata)
+{
+	int caps, retval = 0;
+	struct snd_intelhad *intelhaddata = (struct snd_intelhad *)haddata;
+	unsigned long flag_irqs;
+
+	pr_debug("Enter:%s", __func__);
+
+	spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_debug("had not connected\n");
+		return 0;
+	}
+
+	if (intelhaddata->drv_status != HAD_DRV_SUSPENDED) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_err("had is not in suspended state\n");
+		return 0;
+	}
+
+	if (had_get_hwstate(intelhaddata)) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_err("Failed to resume. Device not accessible\n");
+		return -ENODEV;
+	}
+
+	intelhaddata->drv_status = HAD_DRV_CONNECTED;
+	spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+	/*
+	 * ToDo: Need to enable UNDERRUN interrupts as well
+	 * caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+	 */
+	caps = HDMI_AUDIO_BUFFER_DONE;
+	retval = had_set_caps(HAD_SET_ENABLE_AUDIO_INT, &caps);
+	retval = had_set_caps(HAD_SET_ENABLE_AUDIO, NULL);
+	pr_debug("Exit:%s", __func__);
+	return retval;
+}
+
+static inline int had_chk_intrmiss(struct snd_intelhad *intelhaddata,
+		enum intel_had_aud_buf_type buf_id)
+{
+	int i, intr_count = 0;
+	enum intel_had_aud_buf_type buff_done;
+	u32 buf_size, buf_addr;
+	struct had_pvt_data *had_stream;
+	unsigned long flag_irqs;
+
+	had_stream = intelhaddata->private_data;
+
+	buff_done = buf_id;
+
+	intr_count = snd_intelhad_read_len(intelhaddata);
+	if (intr_count > 1) {
+		/* In case of active playback */
+		pr_err("Driver detected %d missed buffer done interrupt(s)!!!!\n",
+				(intr_count - 1));
+		if (intr_count > 3)
+			return intr_count;
+
+		buf_id += (intr_count - 1);
+		/* Reprogram registers*/
+		for (i = buff_done; i < buf_id; i++) {
+			int j = i % 4;
+
+			buf_size = intelhaddata->buf_info[j].buf_size;
+			buf_addr = intelhaddata->buf_info[j].buf_addr;
+			had_write_register(AUD_BUF_A_LENGTH +
+					(j * HAD_REG_WIDTH), buf_size);
+			had_write_register(
+					AUD_BUF_A_ADDR+(j * HAD_REG_WIDTH),
+					(buf_addr | BIT(0) | BIT(1)));
+		}
+		buf_id = buf_id % 4;
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+		intelhaddata->buff_done = buf_id;
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+	}
+
+	return intr_count;
+}
+
+int had_process_buffer_done(struct snd_intelhad *intelhaddata)
+{
+	int retval = 0;
+	u32 len = 1;
+	enum intel_had_aud_buf_type buf_id;
+	enum intel_had_aud_buf_type buff_done;
+	struct pcm_stream_info *stream;
+	u32 buf_size;
+	struct had_pvt_data *had_stream;
+	int intr_count;
+	enum had_status_stream		stream_type;
+	unsigned long flag_irqs;
+
+	had_stream = intelhaddata->private_data;
+	stream = &intelhaddata->stream_info;
+	intr_count = 1;
+
+	spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_err("%s:Device already disconnected\n", __func__);
+		return retval;
+	}
+	buf_id = intelhaddata->curr_buf;
+	intelhaddata->buff_done = buf_id;
+	buff_done = intelhaddata->buff_done;
+	buf_size = intelhaddata->buf_info[buf_id].buf_size;
+	stream_type = had_stream->stream_type;
+
+	pr_debug("Enter:%s buf_id=%d", __func__, buf_id);
+
+	/* Every debug statement has an implication
+	 * of ~5msec. Thus, avoid having >3 debug statements
+	 * for each buffer_done handling.
+	 */
+
+	/* Check for any intr_miss in case of active playback */
+	if (had_stream->stream_type == HAD_RUNNING_STREAM) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		intr_count = had_chk_intrmiss(intelhaddata, buf_id);
+		if (!intr_count || (intr_count > 3)) {
+			pr_err("HAD SW state in non-recoverable!!! mode\n");
+			pr_err("Already played stale data\n");
+			return retval;
+		}
+		buf_id += (intr_count - 1);
+		buf_id = buf_id % 4;
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	}
+
+	intelhaddata->buf_info[buf_id].is_valid = true;
+	if (intelhaddata->valid_buf_cnt-1 == buf_id) {
+		if (had_stream->stream_type >= HAD_RUNNING_STREAM)
+			intelhaddata->curr_buf = HAD_BUF_TYPE_A;
+	} else
+		intelhaddata->curr_buf = buf_id + 1;
+
+	spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+
+	if (had_get_hwstate(intelhaddata)) {
+		pr_err("HDMI cable plugged-out\n");
+		return retval;
+	}
+
+	/*Reprogram the registers with addr and length*/
+	had_write_register(AUD_BUF_A_LENGTH +
+			(buf_id * HAD_REG_WIDTH), buf_size);
+	had_write_register(AUD_BUF_A_ADDR+(buf_id * HAD_REG_WIDTH),
+			intelhaddata->buf_info[buf_id].buf_addr|
+			BIT(0) | BIT(1));
+
+	had_read_register(AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH),
+					&len);
+	pr_debug("%s:Enabled buf[%d]\n", __func__, buf_id);
+
+	/* In case of actual data,
+	 * report buffer_done to above ALSA layer
+	 */
+	buf_size =  intelhaddata->buf_info[buf_id].buf_size;
+	if (stream_type >= HAD_RUNNING_STREAM) {
+		intelhaddata->stream_info.buffer_rendered +=
+			(intr_count * buf_size);
+		stream->period_elapsed(stream->had_substream);
+	}
+
+	return retval;
+}
+
+int had_process_buffer_underrun(struct snd_intelhad *intelhaddata)
+{
+	int retval = 0;
+	enum intel_had_aud_buf_type buf_id;
+	struct pcm_stream_info *stream;
+	struct had_pvt_data *had_stream;
+	enum had_status_stream stream_type;
+	unsigned long flag_irqs;
+	int drv_status;
+
+	had_stream = intelhaddata->private_data;
+	stream = &intelhaddata->stream_info;
+
+	spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	buf_id = intelhaddata->curr_buf;
+	stream_type = had_stream->stream_type;
+	intelhaddata->buff_done = buf_id;
+	drv_status = intelhaddata->drv_status;
+	if (stream_type == HAD_RUNNING_STREAM)
+		intelhaddata->curr_buf = HAD_BUF_TYPE_A;
+
+	spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+
+	pr_debug("Enter:%s buf_id=%d, stream_type=%d\n",
+			__func__, buf_id, stream_type);
+
+	intelhaddata->ops->handle_underrun(intelhaddata);
+
+	if (drv_status == HAD_DRV_DISCONNECTED) {
+		pr_err("%s:Device already disconnected\n", __func__);
+		return retval;
+	}
+
+	if (stream_type == HAD_RUNNING_STREAM) {
+		/* Report UNDERRUN error to above layers */
+		intelhaddata->flag_underrun = 1;
+		stream->period_elapsed(stream->had_substream);
+	}
+
+	return retval;
+}
+
+int had_process_hot_plug(struct snd_intelhad *intelhaddata)
+{
+	int retval = 0;
+	enum intel_had_aud_buf_type buf_id;
+	struct snd_pcm_substream *substream;
+	struct had_pvt_data *had_stream;
+	unsigned long flag_irqs;
+
+	pr_debug("Enter:%s", __func__);
+
+	substream = intelhaddata->stream_info.had_substream;
+	had_stream = intelhaddata->private_data;
+
+	spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	if (intelhaddata->drv_status == HAD_DRV_CONNECTED) {
+		pr_debug("Device already connected\n");
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		return retval;
+	}
+	buf_id = intelhaddata->curr_buf;
+	intelhaddata->buff_done = buf_id;
+	intelhaddata->drv_status = HAD_DRV_CONNECTED;
+	spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+
+	pr_debug("Processing HOT_PLUG, buf_id = %d\n", buf_id);
+
+	 /* Query display driver for audio register base */
+	if (intelhaddata->reg_ops.hdmi_audio_get_register_base
+		(&intelhaddata->audio_reg_base)) {
+			pr_err("Unable to get audio reg base from Display driver\n");
+			goto err;
+	}
+	if(intelhaddata->audio_reg_base == 0){
+		pr_err("audio reg base value is NULL\n");
+		goto err;
+	}
+
+	pr_debug("%s audio_reg_base = %x\n",__func__, intelhaddata->audio_reg_base);
+
+	/* Safety check */
+	if (substream) {
+		pr_debug("There should not be active PB from ALSA\n");
+		pr_debug("Signifies, cable is plugged-in even before\n");
+		pr_debug("processing snd_pcm_disconnect\n");
+		/* Set runtime->state to hw_params done */
+		snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
+	}
+
+	had_build_channel_allocation_map(intelhaddata);
+
+	return retval;
+
+err:
+	pm_runtime_disable(intelhaddata->dev);
+	intelhaddata->dev = NULL;
+	return retval;
+}
+
+int had_process_hot_unplug(struct snd_intelhad *intelhaddata)
+{
+	int caps, retval = 0;
+	enum intel_had_aud_buf_type buf_id;
+	struct had_pvt_data *had_stream;
+	unsigned long flag_irqs;
+
+	pr_debug("Enter:%s", __func__);
+
+	had_stream = intelhaddata->private_data;
+	buf_id = intelhaddata->curr_buf;
+
+	spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+		pr_debug("Device already disconnected\n");
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		return retval;
+	} else {
+		/* Disable Audio */
+		caps = HDMI_AUDIO_BUFFER_DONE;
+		retval = had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+		retval = had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+		intelhaddata->ops->enable_audio(intelhaddata->stream_info.had_substream, 0);
+	}
+
+	intelhaddata->drv_status = HAD_DRV_DISCONNECTED;
+	/* Report to above ALSA layer */
+	if (intelhaddata->stream_info.had_substream != NULL) {
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		pr_debug("%s: unlock -> sending pcm_stop -> lock\n", __func__);
+		snd_pcm_stop(intelhaddata->stream_info.had_substream,
+				SNDRV_PCM_STATE_DISCONNECTED);
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+	}
+
+	had_stream->stream_type = HAD_INIT;
+	spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+	kfree(intelhaddata->chmap->chmap);
+	intelhaddata->chmap->chmap = NULL;
+	intelhaddata->audio_reg_base = 0;
+	pr_debug("%s: unlocked -> returned\n", __func__);
+
+	return retval;
+}
+
+/**
+ * had_event_handler - Call back function to handle events
+ *
+ * @event_type: Event type to handle
+ * @data: data related to the event_type
+ *
+ * This function is invoked to handle HDMI events from client driver.
+ */
+int had_event_handler(enum had_event_type event_type, void *data)
+{
+	int retval = 0;
+	struct snd_intelhad *intelhaddata = data;
+	enum intel_had_aud_buf_type buf_id;
+	struct snd_pcm_substream *substream;
+	struct had_pvt_data *had_stream;
+	unsigned long flag_irqs;
+
+	buf_id = intelhaddata->curr_buf;
+	had_stream = intelhaddata->private_data;
+
+	/* Switching to a function can drop atomicity even in INTR context.
+	 * Thus, a big lock is acquired to maintain atomicity.
+	 * This can be optimized later.
+	 * Currently, only buffer_done/_underrun executes in INTR context.
+	 * Also, locking is implemented separately to avoid real contention
+	 * of data(struct intelhaddata) between IRQ/SOFT_IRQ/PROCESS context.
+	 */
+	substream = intelhaddata->stream_info.had_substream;
+	switch (event_type) {
+	case HAD_EVENT_AUDIO_BUFFER_DONE:
+		retval = had_process_buffer_done(intelhaddata);
+	break;
+
+	case HAD_EVENT_AUDIO_BUFFER_UNDERRUN:
+		retval = had_process_buffer_underrun(intelhaddata);
+	break;
+
+	case HAD_EVENT_HOT_PLUG:
+		retval = had_process_hot_plug(intelhaddata);
+	break;
+
+	case HAD_EVENT_HOT_UNPLUG:
+		retval = had_process_hot_unplug(intelhaddata);
+	break;
+
+	case HAD_EVENT_MODE_CHANGING:
+		pr_debug(" called _event_handler with _MODE_CHANGE event\n");
+		/* Process only if stream is active & cable Plugged-in */
+		spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+		if (intelhaddata->drv_status >= HAD_DRV_DISCONNECTED) {
+			spin_unlock_irqrestore(&intelhaddata->had_spinlock,
+					flag_irqs);
+			break;
+		}
+		spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+		if ((had_stream->stream_type == HAD_RUNNING_STREAM)
+				&& substream)
+			retval = hdmi_audio_mode_change(substream);
+	break;
+
+	default:
+		pr_debug("error un-handled event !!\n");
+		retval = -EINVAL;
+	break;
+
+	}
+	return retval;
+}

From 62d0281f3f491572b2426e66c31184394b31a1bd Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Sat, 20 Feb 2016 18:08:41 -0600
Subject: [PATCH 08/12] add dependency on PM_RUNTIME

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/Kconfig b/sound/Kconfig
index 75c679e..b8b4fce 100644
--- a/sound/Kconfig
+++ b/sound/Kconfig
@@ -138,6 +138,7 @@ config AC97_BUS
 config SUPPORT_HDMI
         bool "SUPPORT_HDMI"
         depends on DRM_I915
+	select PM_RUNTIME
         default n
         help
           Choose this option to support HDMI.

From 9302f62e2eb342f57f3d79ebf5b3b890619b9ce9 Mon Sep 17 00:00:00 2001
From: David Henningsson <david.henningsson@canonical.com>
Date: Fri, 21 Aug 2015 11:08:47 +0200
Subject: [PATCH 09/12] hdmi_audio: Improve position reporting

Using a hw register to calculate sub-period position reports.

This makes PulseAudio happier.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/hdmi_audio/intel_mid_hdmi_audio.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio.c b/sound/hdmi_audio/intel_mid_hdmi_audio.c
index d8c5574..b2337c3 100644
--- a/sound/hdmi_audio/intel_mid_hdmi_audio.c
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio.c
@@ -1550,6 +1550,8 @@ static snd_pcm_uframes_t snd_intelhad_pcm_pointer(
 {
 	struct snd_intelhad *intelhaddata;
 	u32 bytes_rendered = 0;
+	u32 t;
+	int buf_id;

 	/* pr_debug("snd_intelhad_pcm_pointer called\n"); */

@@ -1560,6 +1562,14 @@ static snd_pcm_uframes_t snd_intelhad_pcm_pointer(
 		return SNDRV_PCM_POS_XRUN;
 	}

+	buf_id = intelhaddata->curr_buf % 4;
+	had_read_register(AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH), &t);
+	if (t == 0) {
+		pr_debug("discovered buffer done for buf %d\n", buf_id);
+		/* had_process_buffer_done(intelhaddata); */
+	}
+	t = intelhaddata->buf_info[buf_id].buf_size - t;
+
 	if (intelhaddata->stream_info.buffer_rendered)
 		div_u64_rem(intelhaddata->stream_info.buffer_rendered,
 			intelhaddata->stream_info.ring_buf_size,
@@ -1567,7 +1577,7 @@ static snd_pcm_uframes_t snd_intelhad_pcm_pointer(

 	intelhaddata->stream_info.buffer_ptr = bytes_to_frames(
 						substream->runtime,
-						bytes_rendered);
+						bytes_rendered + t);
 	return intelhaddata->stream_info.buffer_ptr;
 }


From da71a0a7f01f07365a1e0c927625e5507aee32a7 Mon Sep 17 00:00:00 2001
From: David Henningsson <david.henningsson@canonical.com>
Date: Fri, 21 Aug 2015 11:18:19 +0200
Subject: [PATCH 10/12] hdmi_audio: Fixup some monitor

I think this change was given to us, and they claimed it fixed an issue
on some monitor brand. I'm not sure what this patch actually does.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/hdmi_audio/intel_mid_hdmi_audio.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio.c b/sound/hdmi_audio/intel_mid_hdmi_audio.c
index b2337c3..1667748 100644
--- a/sound/hdmi_audio/intel_mid_hdmi_audio.c
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio.c
@@ -386,6 +386,7 @@ static void snd_intelhad_reset_audio_v2(u8 reset)
 static int had_prog_status_reg(struct snd_pcm_substream *substream,
 			struct snd_intelhad *intelhaddata)
 {
+	union aud_cfg cfg_val = {.cfg_regval = 0};
 	union aud_ch_status_0 ch_stat0 = {.status_0_regval = 0};
 	union aud_ch_status_1 ch_stat1 = {.status_1_regval = 0};
 	int format;
@@ -396,6 +397,8 @@ static int had_prog_status_reg(struct snd_pcm_substream *substream,
 						IEC958_AES0_NONAUDIO)>>1;
 	ch_stat0.status_0_regx.clk_acc = (intelhaddata->aes_bits &
 						IEC958_AES3_CON_CLOCK)>>4;
+	cfg_val.cfg_regx.val_bit = ch_stat0.status_0_regx.lpcm_id;
+
 	switch (substream->runtime->rate) {
 	case AUD_SAMPLE_RATE_32:
 		ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_32KHZ;
@@ -474,7 +477,6 @@ int snd_intelhad_prog_audio_ctrl_v2(struct snd_pcm_substream *substream,
 	else
 		cfg_val.cfg_regx_v2.layout = LAYOUT1;

-	cfg_val.cfg_regx_v2.val_bit = 1;
 	had_write_register(AUD_CONFIG, cfg_val.cfg_regval);
 	return 0;
 }
@@ -530,7 +532,6 @@ int snd_intelhad_prog_audio_ctrl_v1(struct snd_pcm_substream *substream,

 	}

-	cfg_val.cfg_regx.val_bit = 1;
 	had_write_register(AUD_CONFIG, cfg_val.cfg_regval);
 	return 0;
 }

From 2c20a521494d0b547282d0fb7d9b7d8ad84dbc81 Mon Sep 17 00:00:00 2001
From: Toyo Abe <toyo.abe@gmail.com>
Date: Thu, 3 Mar 2016 12:57:41 +0900
Subject: [PATCH 11/12] hdmi_audio: Fix mishandling of AUD_HDMI_STATUS_v2
 register.

According to the datasheet, write one to clear these UNDERRUN flag bits.
This fixes the following warning in dmesg.

[15357.574902] had: Unable to clear UNDERRUN bits

Signed-off-by: Toyo Abe <toyo.abe@gmail.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/hdmi_audio/intel_mid_hdmi_audio.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio.c b/sound/hdmi_audio/intel_mid_hdmi_audio.c
index 1667748..86db38e 100644
--- a/sound/hdmi_audio/intel_mid_hdmi_audio.c
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio.c
@@ -1135,7 +1135,6 @@ static void had_clear_underrun_intr_v2(struct snd_intelhad *intelhaddata)
 		pr_debug("HDMI status =0x%x\n", hdmi_status);
 		if (hdmi_status & AUD_CONFIG_MASK_UNDERRUN) {
 			i++;
-			hdmi_status &= ~AUD_CONFIG_MASK_UNDERRUN;
 			had_write_register(AUD_HDMI_STATUS_v2, hdmi_status);
 		} else
 			break;

From 2b24782107f1ad3a2522fd172e847686c337202b Mon Sep 17 00:00:00 2001
From: Jerome Anand <jerome.anand@intel.com>
Date: Fri, 1 Apr 2016 11:07:48 +0530
Subject: [PATCH 12/12] Create a platform device for hdmi audio driver and
 allocate full resources

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/hdmi_audio/intel_mid_hdmi_audio.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/sound/hdmi_audio/intel_mid_hdmi_audio.c b/sound/hdmi_audio/intel_mid_hdmi_audio.c
index 86db38e..6497b6f 100644
--- a/sound/hdmi_audio/intel_mid_hdmi_audio.c
+++ b/sound/hdmi_audio/intel_mid_hdmi_audio.c
@@ -47,6 +47,8 @@ static int hdmi_card_index = SNDRV_DEFAULT_IDX1;
 static char *hdmi_card_id = SNDRV_DEFAULT_STR1;
 static struct snd_intelhad *had_data;

+struct platform_device *gpdev;
+
 module_param(hdmi_card_index, int, 0444);
 MODULE_PARM_DESC(hdmi_card_index,
 		"Index value for INTEL Intel HDMI Audio controller.");
@@ -1481,9 +1483,9 @@ static int snd_intelhad_pcm_prepare(struct snd_pcm_substream *substream)
 	}

 	pr_debug("period_size=%d\n",
-				frames_to_bytes(runtime, runtime->period_size));
+				(int)frames_to_bytes(runtime, runtime->period_size));
 	pr_debug("periods=%d\n", runtime->periods);
-	pr_debug("buffer_size=%d\n", snd_pcm_lib_buffer_bytes(substream));
+	pr_debug("buffer_size=%d\n", (int)snd_pcm_lib_buffer_bytes(substream));
 	pr_debug("rate=%d\n", runtime->rate);
 	pr_debug("channels=%d\n", runtime->channels);

@@ -1997,10 +1999,16 @@ static struct platform_driver had_driver = {
 #ifdef CONFIG_PM
 		.pm	= &had_pm_ops,
 #endif
-		.acpi_match_table = ACPI_PTR(had_acpi_ids),
+		//.acpi_match_table = ACPI_PTR(had_acpi_ids),
 	},
 };

+static const struct platform_device_info hdmi_audio_dev_info = {
+	.name = HDMI_AUDIO_DRIVER,
+	.id = -1,
+	.dma_mask = DMA_BIT_MASK(32),
+};
+
 /*
 * alsa_card_intelhad_init- driver init function
 * This function is called when driver module is inserted
@@ -2020,6 +2028,13 @@ static int __init alsa_card_intelhad_init(void)
 		return retval;
 	}

+	//gpdev = platform_device_register_simple(HDMI_AUDIO_DRIVER, -1, NULL, 0);
+	gpdev = platform_device_register_full(&hdmi_audio_dev_info);
+	if (!gpdev) {
+		pr_err("[jerome] Failed to register platform device \n");
+		return -1;
+	}
+
 	pr_debug("init complete\n");
 	return retval;
 }
@@ -2032,6 +2047,7 @@ static void __exit alsa_card_intelhad_exit(void)
 {
 	pr_debug("had_exit called\n");
 	platform_driver_unregister(&had_driver);
+	platform_device_unregister(gpdev);
 }
 late_initcall(alsa_card_intelhad_init);
 module_exit(alsa_card_intelhad_exit);