ASoC: OMAP: Add checking to detect bufferless pcms

Add checking in hw_params and prepare to detect bufferless pcms(i.e. BT
<--> codec).

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index 07cf7f46b584..6454e15f7d28 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -87,8 +87,10 @@ static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
         struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
         int err = 0;
 
+        /* return if this is a bufferless transfer e.g.
+         * codec <--> BT codec or GSM modem -- lg FIXME */
         if (!dma_data)
-                return -ENODEV;
+                return 0;
 
         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
         runtime->dma_bytes = params_buffer_bytes(params);
@@ -134,6 +136,11 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
         struct omap_dma_channel_params dma_params;
 
+        /* return if this is a bufferless transfer e.g.
+         * codec <--> BT codec or GSM modem -- lg FIXME */
+        if (!prtd->dma_data)
+                return 0;
+
         memset(&dma_params, 0, sizeof(dma_params));
         /*
          * Note: Regardless of interface data formats supported by OMAP McBSP