diff options
| author | Brent Lu <brent.lu@intel.com> | 2020-07-31 15:26:04 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-08-21 17:04:28 +0300 |
| commit | 5e7820e369248f880767c4c4079b414529bc2125 (patch) | |
| tree | fcb46e3449bdde15a9333b3e060c95c420483f64 /sound/soc/intel/atom | |
| parent | 5610921a4435ef45c33702073e64f835f3dca7f1 (diff) | |
| download | linux-5e7820e369248f880767c4c4079b414529bc2125.tar.xz | |
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>
Diffstat (limited to 'sound/soc/intel/atom')
| -rw-r--r-- | sound/soc/intel/atom/sst-mfld-platform-pcm.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sound/soc/intel/atom/sst-mfld-platform-pcm.c b/sound/soc/intel/atom/sst-mfld-platform-pcm.c index b1cac7abdc0a..fba2c795ce0d 100644 --- a/sound/soc/intel/atom/sst-mfld-platform-pcm.c +++ b/sound/soc/intel/atom/sst-mfld-platform-pcm.c @@ -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); |