[alsa-devel] [v2 1/3] ASoC: Intel: Fix cracking noise in rt5663 headphones for kabylake platform

[Vinod Koul]

On Wed, Jul 26, 2017 at 01:47:43PM -0700, Harsha Priya wrote:
> This patch fixes the cracking noise in rt5663 headphones for kabylake platform
> by calling the rt5663_sel_asrc_clk_src() for RT5663_AD_STEREO_FILTER as well.

and it sets 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 100fs. ASRC function
	   ^^^^
double space

> will track i2s clock and generate a corresponding system clock for codec.
> Calling this function helps select the 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 at intel.com>
> ---
>  sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> index 3fe4a08..cfde894 100644
> --- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> +++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> @@ -319,7 +319,9 @@ static int kabylake_rt5663_hw_params(struct snd_pcm_substream *substream,
>  	int ret;
>  
>  	/* 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);
> -- 
> 1.9.1
> 

-- 
~Vinod