Driver does not expect the appl_ptr to move backward and requires explict sync. Make sure that the userspace does not do appl_ptr rewinds by specifying the correct flags in pcm_info.
Without this patch, the result could be a forever loop as current logic assumes that appl_ptr can only move forward.
Fixes: 3d4a4411aa8b ("ASoC: q6apm-dai: schedule all available frames to avoid dsp under-runs") Cc: Stable@vger.kernel.org Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@oss.qualcomm.com Tested-by: Alexey Klimov alexey.klimov@linaro.org # RB5, RB3 --- sound/soc/qcom/qdsp6/q6apm-dai.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/soc/qcom/qdsp6/q6apm-dai.c b/sound/soc/qcom/qdsp6/q6apm-dai.c index 4ecaff45c518..786ab3222515 100644 --- a/sound/soc/qcom/qdsp6/q6apm-dai.c +++ b/sound/soc/qcom/qdsp6/q6apm-dai.c @@ -86,6 +86,7 @@ static const struct snd_pcm_hardware q6apm_dai_hardware_capture = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_NO_REWINDS | SNDRV_PCM_INFO_SYNC_APPLPTR | SNDRV_PCM_INFO_BATCH), .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE), .rates = SNDRV_PCM_RATE_8000_48000, @@ -105,6 +106,7 @@ static const struct snd_pcm_hardware q6apm_dai_hardware_playback = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_NO_REWINDS | SNDRV_PCM_INFO_SYNC_APPLPTR | SNDRV_PCM_INFO_BATCH), .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE), .rates = SNDRV_PCM_RATE_8000_192000,