From: Yu-Hsuan Hsu <yuhsuan@xxxxxxxxxxxx> The CRAS server does not set the period size in hw_param so ALSA will calculate a value for period size which is based on the buffer size and other parameters. The value may not always be aligned with Atom's dsp design so a constraint is added to make sure the board always has a good value. Cyan uses chtmax98090 and others(banon, celes, edgar, kefka...) use rt5650. Signed-off-by: Yu-Hsuan Hsu <yuhsuan@xxxxxxxxxxxx> Signed-off-by: Brent Lu <brent.lu@xxxxxxxxx> --- sound/soc/intel/boards/cht_bsw_max98090_ti.c | 14 +++++++++++++- sound/soc/intel/boards/cht_bsw_rt5645.c | 14 +++++++++++++- 2 files changed, 26 insertions(+), 2 deletions(-) diff --git a/sound/soc/intel/boards/cht_bsw_max98090_ti.c b/sound/soc/intel/boards/cht_bsw_max98090_ti.c index 835e9bd..bf67254 100644 --- a/sound/soc/intel/boards/cht_bsw_max98090_ti.c +++ b/sound/soc/intel/boards/cht_bsw_max98090_ti.c @@ -283,8 +283,20 @@ static int cht_codec_fixup(struct snd_soc_pcm_runtime *rtd, static int cht_aif1_startup(struct snd_pcm_substream *substream) { - return snd_pcm_hw_constraint_single(substream->runtime, + int err; + + /* Set period size to 240 to align with Atom design */ + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 240, 240); + if (err < 0) + return err; + + err = snd_pcm_hw_constraint_single(substream->runtime, SNDRV_PCM_HW_PARAM_RATE, 48000); + if (err < 0) + return err; + + return 0; } static int cht_max98090_headset_init(struct snd_soc_component *component) diff --git a/sound/soc/intel/boards/cht_bsw_rt5645.c b/sound/soc/intel/boards/cht_bsw_rt5645.c index b53c024..6e62f0d 100644 --- a/sound/soc/intel/boards/cht_bsw_rt5645.c +++ b/sound/soc/intel/boards/cht_bsw_rt5645.c @@ -414,8 +414,20 @@ static int cht_codec_fixup(struct snd_soc_pcm_runtime *rtd, static int cht_aif1_startup(struct snd_pcm_substream *substream) { - return snd_pcm_hw_constraint_single(substream->runtime, + int err; + + /* Set period size to 240 to align with Atom design */ + err = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 240, 240); + if (err < 0) + return err; + + err = snd_pcm_hw_constraint_single(substream->runtime, SNDRV_PCM_HW_PARAM_RATE, 48000); + if (err < 0) + return err; + + return 0; } static const struct snd_soc_ops cht_aif1_ops = { -- 2.7.4