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>

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index 07cf7f4..6454e15 100644 (file)
--- 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