On Fri, Aug 11, 2017 at 10:30:46AM +0530, Naveen M wrote: > From: Harsha Priya N <harshapriya.n@xxxxxxxxx> > > Patch fixes cracking noise in rt5663 headphones for kbl platform by > calling rt5663_sel_asrc_clk_src() for RT5663_AD_STEREO_FILTER to set > ASRC. > > The ASRC function is for asynchronous MCLK and LRCK. For RT5663 ASRC > should be enabled to support special i2s clock format like Intel's ^^^^^^ daouble space it is not special, it is pcm format with 100fs > 100fs. ASRC function will track i2s clock and generate corresponding > system clock for codec. Calling this func helps select clock source > for both RT5663_AD_STEREO_FILTER and RT5663_DA_STEREO_FILTER filters > which fixes the crackling sound. > > Signed-off-by: Harsha Priya <harshapriya.n@xxxxxxxxx> > Signed-off-by: Shruthi Sudhakar <shruthi.sudhakar@xxxxxxxxx> > Signed-off-by: Naveen M <naveen.m@xxxxxxxxx> > > diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c > index f9ba977..29b50e4 100644 > --- a/sound/soc/intel/boards/kbl_rt5663_max98927.c > +++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c > @@ -312,11 +312,13 @@ static int kabylake_rt5663_hw_params(struct snd_pcm_substream *substream, > struct snd_soc_dai *codec_dai = rtd->codec_dai; > int ret; > > - ret = snd_soc_dai_set_sysclk(codec_dai, > - RT5663_SCLK_S_MCLK, 24576000, SND_SOC_CLOCK_IN); > /* use ASRC for internal clocks, as PLL rate isn't multiple of BCLK */ > - rt5663_sel_asrc_clk_src(codec_dai->codec, RT5663_DA_STEREO_FILTER, 1); > + rt5663_sel_asrc_clk_src(codec_dai->codec, > + RT5663_DA_STEREO_FILTER | RT5663_AD_STEREO_FILTER, > + RT5663_CLK_SEL_I2S1_ASRC); > > + ret = snd_soc_dai_set_sysclk(codec_dai, > + RT5663_SCLK_S_MCLK, 24576000, SND_SOC_CLOCK_IN); > if (ret < 0) > dev_err(rtd->dev, "snd_soc_dai_set_sysclk err = %d\n", ret); > > -- > 1.9.1 > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@xxxxxxxxxxxxxxxx > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel -- ~Vinod _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
