ASoC: stm32: spdifrx: 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: NOlivier Moysan <olivier.moysan@st.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/stm/stm32_spdifrx.c

@@ -845,7 +845,8 @@ static struct snd_soc_dai_driver stm32_spdifrx_dai[] = {
 static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
 	.buffer_bytes_max = 8 * PAGE_SIZE,
-	.period_bytes_max = 2048, /* MDMA constraint */
+	.period_bytes_min = 1024,
+	.period_bytes_max = 4 * PAGE_SIZE,
 	.periods_min = 2,
 	.periods_max = 8,
 };