ASoC: OMAP: Use McBSP threshold to playback and capture

This patch changes the way DMA is done in omap-pcm.c
in order to reduce power consumption. There is no need
to have so much SW control in order to have DMA in idle
state during audio streaming. Configuring McBSP threshold value
and DMA to FRAME_SYNC are sufficient.

Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index b9633d5a9557..5735945788bf 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -162,7 +162,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
          */
         dma_params.data_type                    = OMAP_DMA_DATA_TYPE_S16;
         dma_params.trigger                      = dma_data->dma_req;
-        dma_params.sync_mode                    = OMAP_DMA_SYNC_ELEMENT;
+        dma_params.sync_mode                    = dma_data->sync_mode;
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
@@ -205,6 +205,7 @@ static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
         struct snd_pcm_runtime *runtime = substream->runtime;
         struct omap_runtime_data *prtd = runtime->private_data;
+        struct omap_pcm_dma_data *dma_data = prtd->dma_data;
         unsigned long flags;
         int ret = 0;
 
@@ -214,6 +215,10 @@ static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
         case SNDRV_PCM_TRIGGER_RESUME:
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                 prtd->period_index = 0;
+                /* Configure McBSP internal buffer usage */
+                if (dma_data->set_threshold)
+                        dma_data->set_threshold(substream);
+
                 omap_start_dma(prtd->dma_ch);
                 break;