[PATCH 6.12 353/567] ASoC: qcom: qdsp6: q6asm-dai: set 10 ms period and buffer alignment.

Greg Kroah-Hartman
2026-01-06T17:35:36Z

From: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>

commit 81c53b52de21b8d5a3de55ebd06b6bf188bf7efd upstream.

DSP expects the periods to be aligned to fragment sizes, currently
setting up to hw constriants on periods bytes is not going to work
correctly as we can endup with periods sizes aligned to 32 bytes however
not aligned to fragment size.

Update the constriants to use fragment size, and also set at step of
10ms for period size to accommodate DSP requirements of 10ms latency.

Fixes: 2a9e92d371db ("ASoC: qdsp6: q6asm: Add q6asm dai driver")
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/20251023102444.88158-4-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/soc/qcom/qdsp6/q6asm-dai.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/soc/qcom/qdsp6/q6asm-dai.c
+++ b/sound/soc/qcom/qdsp6/q6asm-dai.c
@@ -403,13 +403,13 @@ static int q6asm_dai_open(struct snd_soc
}

ret = snd_pcm_hw_constraint_step(runtime, 0,
- SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 480);
if (ret < 0) {
dev_err(dev, "constraint for period bytes step ret = %d\n",
ret);
}
ret = snd_pcm_hw_constraint_step(runtime, 0,
- SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 480);
if (ret < 0) {
dev_err(dev, "constraint for buffer bytes step ret = %d\n",
ret);