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@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index 97d5e9901a0ee3286de08b72010eb02f03b2c786..8ee697ff1f86f7efbe6fc53fa42da5dfae82bb38 100644 (file)
--- 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,
 };