ASoC: qdsp6: q6apm-dai: set 10 ms period and buffer alignment.

JIRA: https://issues.redhat.com/browse/RHEL-80657

commit 3107019
Author: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Date: Fri Mar 14 17:47:59 2025 +0000

    ASoC: qdsp6: q6apm-dai: set 10 ms period and buffer alignment.

    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: 9b4fe0f ("ASoC: qdsp6: audioreach: add q6apm-dai support")
    Cc: stable@vger.kernel.org
    Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
    Tested-by: Johan Hovold <johan+linaro@kernel.org>
    Link: https://patch.msgid.link/20250314174800.10142-5-srinivas.kandagatla@linaro.org
    Signed-off-by: Mark Brown <broonie@kernel.org>

Signed-off-by: Jaroslav Kysela <jkysela@redhat.com>

Author: jkysela-rh

sound/soc/qcom/qdsp6/q6apm-dai.c

@@ -394,13 +394,14 @@ static int q6apm_dai_open(struct snd_soc_component *component,
 		}
 	}
 
-	ret = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+	/* setup 10ms latency to accommodate DSP restrictions */
+	ret = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 480);
 	if (ret < 0) {
 		dev_err(dev, "constraint for period bytes step ret = %d\n", ret);
 		goto err;
 	}
 
-	ret = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+	ret = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 480);
 	if (ret < 0) {
 		dev_err(dev, "constraint for buffer bytes step ret = %d\n", ret);
 		goto err;