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ASoC: fsl: fsl_qmc_audio: Reset audio data pointers on TRIGGER_START event

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On SNDRV_PCM_TRIGGER_START event, audio data pointers are not reset.

This leads to wrong data buffer usage when multiple TRIGGER_START are
received and ends to incorrect buffer usage between the user-space and
the driver. Indeed, the driver can read data that are not already set by
the user-space or the user-space and the driver are writing and reading
the same area.

Fix that resetting data pointers on each SNDRV_PCM_TRIGGER_START events.

Fixes: 075c7125b1 ("ASoC: fsl: Add support for QMC audio")
Cc: stable@vger.kernel.org
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Link: https://patch.msgid.link/20250410091643.535627-1-herve.codina@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Herve Codina 2025-04-10 11:16:43 +02:00 committed by Mark Brown
parent 5fc7d2b5ca
commit 9aa33d5b4a
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1 changed files with 3 additions and 0 deletions
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3
sound/soc/fsl/fsl_qmc_audio.c
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@ -250,6 +250,9 @@ static int qmc_audio_pcm_trigger(struct snd_soc_component *component,
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
bitmap_zero(prtd->chans_pending, 64);
prtd->buffer_ended = 0;
prtd->ch_dma_addr_current = prtd->ch_dma_addr_start;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
for (i = 0; i < prtd->channels; i++)
prtd->qmc_dai->chans[i].prtd_tx = prtd;