diff -bur -x .git msm8996-O/sound/soc/msm/qdsp6v2/msm-qti-pp-config.c msm8996-O2/sound/soc/msm/qdsp6v2/msm-qti-pp-config.c
--- msm8996-O/sound/soc/msm/qdsp6v2/msm-qti-pp-config.c	2017-11-23 04:30:52.273658118 -0600
+++ msm8996-O2/sound/soc/msm/qdsp6v2/msm-qti-pp-config.c	2017-11-23 04:25:03.391528272 -0600
@@ -572,6 +572,28 @@
 	return 0;
 }

+static int msm_afe_lb_vol_ctrl_mmi;
+static const DECLARE_TLV_DB_LINEAR(afe_lb_vol_gain_mmi, 0, INT_RX_VOL_MAX_STEPS);
+
+static int msm_qti_pp_get_slimbus_0_tx_lb_vol_mixer(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.integer.value[0] = msm_afe_lb_vol_ctrl_mmi;
+	return 0;
+}
+
+static int msm_qti_pp_set_slimbus_0_tx_lb_vol_mixer(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_value *ucontrol)
+{
+	afe_loopback_gain(SLIMBUS_0_TX,
+			  ucontrol->value.integer.value[0]);
+	pr_info("%s: mmi vol %ld\n", __func__, ucontrol->value.integer.value[0]);
+
+	msm_afe_lb_vol_ctrl_mmi = ucontrol->value.integer.value[0];
+
+	return 0;
+}
+
 static int msm_qti_pp_get_channel_map_mixer(struct snd_kcontrol *kcontrol,
 					    struct snd_ctl_elem_value *ucontrol)
 {
@@ -856,6 +878,12 @@
 	sec_auxpcm_lb_vol_gain),
 };

+static const struct snd_kcontrol_new int_mmi_vol_mixer_controls[] = {
+	SOC_SINGLE_EXT_TLV("SLIMBUS LOOPBACK Volume", SND_SOC_NOPM, 0,
+	INT_RX_VOL_GAIN, 0, msm_qti_pp_get_slimbus_0_tx_lb_vol_mixer,
+	msm_qti_pp_set_slimbus_0_tx_lb_vol_mixer, afe_lb_vol_gain_mmi),
+};
+
 static const struct snd_kcontrol_new multi_ch_channel_map_mixer_controls[] = {
 	SOC_SINGLE_MULTI_EXT("Playback Device Channel Map", SND_SOC_NOPM, 0, 16,
 	0, 8, msm_qti_pp_get_channel_map_mixer,
@@ -1060,4 +1088,7 @@

 	snd_soc_add_platform_controls(platform, msm_multichannel_ec_controls,
 			ARRAY_SIZE(msm_multichannel_ec_controls));
+
+	snd_soc_add_platform_controls(platform, int_mmi_vol_mixer_controls,
+			ARRAY_SIZE(int_mmi_vol_mixer_controls));
 }