diff --git a/sound/soc/sunxi/sunxi-codec.c b/sound/soc/sunxi/sunxi-codec.c
index 3b266f1..26c81ad 100644
--- a/sound/soc/sunxi/sunxi-codec.c
+++ b/sound/soc/sunxi/sunxi-codec.c
@@ -100,7 +100,7 @@ static struct snd_pcm_hardware sunxi_pcm_playback_hardware =
 				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
 				   SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 				   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
-	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+    .formats        = SNDRV_PCM_FMTBIT_S24_BE,
 	.rates			= (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |SNDRV_PCM_RATE_11025 |\
 				   SNDRV_PCM_RATE_22050| SNDRV_PCM_RATE_32000 |\
 				   SNDRV_PCM_RATE_44100| SNDRV_PCM_RATE_48000 |SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000 |\
@@ -110,9 +110,9 @@ static struct snd_pcm_hardware sunxi_pcm_playback_hardware =
 	.channels_min		= 1,
 	.channels_max		= 2,
 	.buffer_bytes_max	= 128*1024,//最大的缓冲区大小
-	.period_bytes_min	= 1024*4,//最小周期大小
+    .period_bytes_min   = 16*2,//最小周期大小
 	.period_bytes_max	= 1024*32,//最大周期大小
-	.periods_min		= 4,//最小周期数
+    .periods_min        = 2,//最小周期数
 	.periods_max		= 8,//最大周期数
 	.fifo_size	     	= 32,//fifo字节数
 };
@@ -124,7 +124,7 @@ static struct snd_pcm_hardware sunxi_pcm_capture_hardware =
 				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
 				   SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 				   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
-	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+    .formats        = SNDRV_PCM_FMTBIT_S24_BE,
 	.rates			= (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |SNDRV_PCM_RATE_11025 |\
 				   SNDRV_PCM_RATE_22050| SNDRV_PCM_RATE_32000 |\
 				   SNDRV_PCM_RATE_44100| SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |SNDRV_PCM_RATE_192000 |\
@@ -134,9 +134,9 @@ static struct snd_pcm_hardware sunxi_pcm_capture_hardware =
 	.channels_min		= 1,
 	.channels_max		= 2,
 	.buffer_bytes_max	= 128*1024,//最大的缓冲区大小
-	.period_bytes_min	= 1024*4,//最小周期大小
+    .period_bytes_min   = 16*2,//最小周期大小
 	.period_bytes_max	= 1024*32,//最大周期大小
-	.periods_min		= 4,//最小周期数
+    .periods_min        = 2,//最小周期数
 	.periods_max		= 8,//最大周期数
 	.fifo_size	     	= 32,//fifo字节数
 };
@@ -321,7 +321,13 @@ static  int codec_init(void)
 	//enable dac digital
 	codec_wr_control(SUNXI_DAC_DPC, 0x1, DAC_EN, 0x1);
 
-	codec_wr_control(SUNXI_DAC_FIFOC ,  0x1,28, 0x1);
+    //set TX and RX sampling resolution to 24bits
+    codec_wr_control(SUNXI_DAC_FIFOC, 0x1, TASR, 0x1);
+    codec_wr_control(SUNXI_ADC_FIFOC, 0x1, RASR, 0x1);
+
+    //set FIR Version to 32-Tap
+    codec_wr_control(SUNXI_DAC_FIFOC, 0x1, FIR_VERSION, 0x1);
+
 	//set digital volume to maximum
 	if (codec_chip_ver == SUNXI_VER_A10A)
 		codec_wr_control(SUNXI_DAC_DPC, 0x6, DIGITAL_VOL, 0x0);
@@ -365,12 +371,12 @@ static int codec_play_open(struct snd_pcm_substream *substream)
 	//set TX FIFO send drq level
 	codec_wr_control(SUNXI_DAC_FIFOC ,0x4, TX_TRI_LEVEL, 0xf);
 	if(substream->runtime->rate > 32000){
-		codec_wr_control(SUNXI_DAC_FIFOC ,  0x1,28, 0x0);
+        codec_wr_control(SUNXI_DAC_FIFOC, 0x1, FIR_VERSION, 0x0);
 	}else{
-		codec_wr_control(SUNXI_DAC_FIFOC ,  0x1,28, 0x1);
+        codec_wr_control(SUNXI_DAC_FIFOC, 0x1, FIR_VERSION, 0x1);
 	}
 	//set TX FIFO MODE
-	codec_wr_control(SUNXI_DAC_FIFOC ,0x1, TX_FIFO_MODE, 0x1);
+    //codec_wr_control(SUNXI_DAC_FIFOC ,0x1, TX_FIFO_MODE, 0x1);
 	//send last sample when dac fifo under run
 	codec_wr_control(SUNXI_DAC_FIFOC ,0x1, LAST_SE, 0x0);
 	//enable dac analog
@@ -398,7 +404,7 @@ static int codec_capture_open(void)
 	 //enable adc digital
 	 codec_wr_control(SUNXI_ADC_FIFOC, 0x1,ADC_DIG_EN, 0x1);
 	 //set RX FIFO mode
-	 codec_wr_control(SUNXI_ADC_FIFOC, 0x1, RX_FIFO_MODE, 0x1);
+     //codec_wr_control(SUNXI_ADC_FIFOC, 0x1, RX_FIFO_MODE, 0x1);
 	 //flush RX FIFO
 	 codec_wr_control(SUNXI_ADC_FIFOC, 0x1, ADC_FIFO_FLUSH, 0x1);
 	 //set RX FIFO rec drq level