From eb55fab997c0bf1b1ddf0a7199da0ceb18432b96 Mon Sep 17 00:00:00 2001 From: Mengdong Lin Date: Wed, 7 Jan 2015 10:19:23 +0800 Subject: [PATCH] ASoC: Intel: Select RT5672 ASRC clock source on Cherrytrail and Braswell On Cherrytrail and Braswell, the I2S BCLK is 100FS which cannot be supported by RT5672 in slave mode and can cause noise. This patch selects codec ASRC clock source to track I2S1 clock so that codec ASRC can be enabled to suppress the noise. Signed-off-by: Mengdong Lin Reviewed-by: Bard Liao Signed-off-by: Mark Brown --- sound/soc/intel/cht_bsw_rt5672.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/sound/soc/intel/cht_bsw_rt5672.c b/sound/soc/intel/cht_bsw_rt5672.c index a406c6104897..ff016621583a 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; }