ASoC: omap-pcm: Allow only formats with 1, 2, and 4 byte physical size

sDMA support only transfer elements with 1, 2, and 4 byte physical
size. Initialize the pcm driver accordingly.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index f4b05bc23e4b..e49ee2383a88 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -39,7 +39,7 @@
 #define pcm_omap1510()  0
 #endif
 
-static const struct snd_pcm_hardware omap_pcm_hardware = {
+static struct snd_pcm_hardware omap_pcm_hardware = {
         .info                   = SNDRV_PCM_INFO_MMAP |
                                   SNDRV_PCM_INFO_MMAP_VALID |
                                   SNDRV_PCM_INFO_INTERLEAVED |
@@ -53,6 +53,24 @@ static const struct snd_pcm_hardware omap_pcm_hardware = {
         .buffer_bytes_max       = 128 * 1024,
 };
 
+/* sDMA supports only 1, 2, and 4 byte transfer elements. */
+static void omap_pcm_limit_supported_formats(void)
+{
+        int i;
+
+        for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
+                switch (snd_pcm_format_physical_width(i)) {
+                case 8:
+                case 16:
+                case 32:
+                        omap_pcm_hardware.formats |= (1LL << i);
+                        break;
+                default:
+                        break;
+                }
+        }
+}
+
 /* this may get called several times by oss emulation */
 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
                               struct snd_pcm_hw_params *params)
@@ -235,6 +253,7 @@ static struct snd_soc_platform_driver omap_soc_platform = {
 
 int omap_pcm_platform_register(struct device *dev)
 {
+        omap_pcm_limit_supported_formats();
         return devm_snd_soc_register_platform(dev, &omap_soc_platform);
 }
 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);