ASoC: stm32: sai: add restriction on mmap support

Do not support mmap in S/PDIF mode. In S/PDIF mode
the buffer has to be copied, to allow the channel status
bits insertion.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Link: https://lore.kernel.org/r/20191104133654.28750-1-olivier.moysan@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index a4060813bc74..48e629ac2d88 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -1218,6 +1218,16 @@ static int stm32_sai_pcm_process_spdif(struct snd_pcm_substream *substream,
         return 0;
 }
 
+/* No support of mmap in S/PDIF mode */
+static const struct snd_pcm_hardware stm32_sai_pcm_hw_spdif = {
+        .info = SNDRV_PCM_INFO_INTERLEAVED,
+        .buffer_bytes_max = 8 * PAGE_SIZE,
+        .period_bytes_min = 1024,
+        .period_bytes_max = PAGE_SIZE,
+        .periods_min = 2,
+        .periods_max = 8,
+};
+
 static const struct snd_pcm_hardware stm32_sai_pcm_hw = {
         .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
         .buffer_bytes_max = 8 * PAGE_SIZE,
@@ -1270,7 +1280,7 @@ static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config = {
 };
 
 static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config_spdif = {
-        .pcm_hardware = &stm32_sai_pcm_hw,
+        .pcm_hardware = &stm32_sai_pcm_hw_spdif,
         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
         .process = stm32_sai_pcm_process_spdif,
 };