linux-kernel - [PATCH 1/2] ASoC: stm32: i2s: update pcm hardware constraints

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Date:   Mon, 6 May 2019 14:54:11 +0200
From:   Olivier Moysan <olivier.moysan@...com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <alsa-devel@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>, <olivier.moysan@...com>,
        <arnaud.pouliquen@...com>
CC:     <benjamin.gaignard@...com>
Subject: [PATCH 1/2] ASoC: stm32: i2s: update pcm hardware constraints

- Set period minimum size. Ensure at least 5ms period
up to 48kHz/16 bits to prevent underrun/overrun.
- Remove MDMA constraints on period maximum size and
set period maximum to half the buffer maximum size.

Signed-off-by: Olivier Moysan <olivier.moysan@...com>
---
 sound/soc/stm/stm32_i2s.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index 97d5e9901a0e..8ee697ff1f86 100644
--- a/sound/soc/stm/stm32_i2s.c
+++ b/sound/soc/stm/stm32_i2s.c
@@ -731,7 +731,8 @@ static const struct snd_soc_dai_ops stm32_i2s_pcm_dai_ops = {
 static const struct snd_pcm_hardware stm32_i2s_pcm_hw = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
 	.buffer_bytes_max = 8 * PAGE_SIZE,
-	.period_bytes_max = 2048,
+	.period_bytes_min = 1024,
+	.period_bytes_max = 4 * PAGE_SIZE,
 	.periods_min = 2,
 	.periods_max = 8,
 };
-- 
2.7.4