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ASoC: qcom: q6apm-dai: Add SNDRV_PCM_INFO_BATCH flag
At the moment, playing audio with PulseAudio with the qdsp6 driver
results in distorted sound. It seems like its timer-based scheduling
does not work properly with qdsp6 since setting tsched=0 in
the PulseAudio configuration avoids the issue.
Apparently this happens when the pointer() callback is not accurate
enough. There is a SNDRV_PCM_INFO_BATCH flag that can be used to stop
PulseAudio from using timer-based scheduling by default.
According to https://www.alsa-project.org/pipermail/alsa-devel/2014-March/073816.html:
The flag is being used in the sense explained in the previous audio
meeting -- the data transfer granularity isn't fine enough but aligned
to the period size (or less).
q6apm-dai reports the position as multiple of
prtd->pcm_count = snd_pcm_lib_period_bytes(substream)
so it indeed just a multiple of the period size.
Therefore adding the flag here seems appropriate and makes audio
work out of the box.
Comment log inspired by Stephan Gerhold sent for q6asm-dai.c few years back.
Fixes: 9b4fe0f1cd
("ASoC: qdsp6: audioreach: add q6apm-dai support")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230209122806.18923-4-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
parent
84222ef54b
commit
aa759f3f9f
1 changed files with 4 additions and 2 deletions
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@ -64,7 +64,8 @@ struct q6apm_dai_data {
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static struct snd_pcm_hardware q6apm_dai_hardware_capture = {
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_BATCH),
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.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE),
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.rates = SNDRV_PCM_RATE_8000_48000,
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.rate_min = 8000,
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@ -82,7 +83,8 @@ static struct snd_pcm_hardware q6apm_dai_hardware_capture = {
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static struct snd_pcm_hardware q6apm_dai_hardware_playback = {
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_BATCH),
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.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE),
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.rates = SNDRV_PCM_RATE_8000_192000,
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.rate_min = 8000,
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