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ASoC: Intel: Enabling ASRC for RT5663 codec on kabylake platform

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This patch fixes the cracking noise in rt5663 headphones for kabylake 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 100fs.
ASRC function 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@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Harsha Priya N 2017-07-27 17:41:25 -07:00 committed by Mark Brown
parent b76e3f9333
commit 349d63c33a
1 changed files with 3 additions and 1 deletions
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4
sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
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@ -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);