From: Mengdong Lin mengdong.lin@intel.com
On Cherrytrail and Braswell, the I2S BCLK is 100FS which cannot be supported by RT5670 in slave mode and can cause noise.
Signed-off-by: Mengdong Lin mengdong.lin@intel.com
diff --git a/sound/soc/intel/cht_bsw_rt5672.c b/sound/soc/intel/cht_bsw_rt5672.c index 9b8b561..54a8f72 100644 --- a/sound/soc/intel/cht_bsw_rt5672.c +++ b/sound/soc/intel/cht_bsw_rt5672.c @@ -140,6 +140,7 @@ static int cht_codec_init(struct snd_soc_pcm_runtime *runtime) { int ret; struct snd_soc_dai *codec_dai = runtime->codec_dai; + struct snd_soc_codec *codec = codec_dai->codec;
/* TDM 4 slots 24 bit, set Rx & Tx bitmask to 4 active slots */ ret = snd_soc_dai_set_tdm_slot(codec_dai, 0xF, 0xF, 4, 24); @@ -148,6 +149,19 @@ static int cht_codec_init(struct snd_soc_pcm_runtime *runtime) return ret; }
+ /* Select codec ASRC clock source to track I2S1 clock, because codec + * is in slave mode and 100fs I2S format (BCLK = 100 * LRCLK) cannot + * be supported by RT5672. Otherwise, ASRC will be disabled and cause + * noise. + */ + rt5670_sel_asrc_clk_src(codec, + RT5670_DA_STEREO_FILTER + | RT5670_DA_MONO_L_FILTER + | RT5670_DA_MONO_R_FILTER + | RT5670_AD_STEREO_FILTER + | RT5670_AD_MONO_L_FILTER + | RT5670_AD_MONO_R_FILTER, + RT5670_CLK_SEL_I2S1_ASRC); return 0; }