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ASoC: intel: atom: Add period size constraint 

Use constraint to make sure the period size could always be multiple
of 1ms to align with the fundamental design/limitation of firmware.

Signed-off-by: Brent Lu <brent.lu@intel.com>
Link: https://lore.kernel.org/r/1596198365-10105-2-git-send-email-brent.lu@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Brent Lu 2020-07-31 20:26:04 +08:00 committed by Mark Brown
parent 5610921a44
commit 5e7820e369
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 0 deletions
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11
sound/soc/intel/atom/sst-mfld-platform-pcm.c
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@ -333,6 +333,17 @@ static int sst_media_open(struct snd_pcm_substream *substream,
if (ret_val < 0)
goto out_power_up;
/*
* Make sure the period to be multiple of 1ms to align the
* design of firmware. Apply same rule to buffer size to make
* sure alsa could always find a value for period size
* regardless the buffer size given by user space.
*/
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 48);
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 48);
/* Make sure, that the period size is always even */
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIODS, 2);