ASoC: qcom: q6apm-dai: set flags to reflect correct operation of appl_ptr

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
Link: https://patch.msgid.link/20251023102444.88158-2-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/qcom/qdsp6/q6apm-dai.c b/sound/soc/qcom/qdsp6/q6apm-dai.c
index 4ecaff45c51860cddc631725953ba7dfa84eeb50..786ab3222515c3ad2e8fcc582af984bcb2655d0a 100644 (file)
--- 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,