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| author | Eduardo Valentin <eduardo.valentin@nokia.com> | 2009-08-20 16:18:25 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-08-20 20:10:29 +0100 |
| commit | caebc0cb3ba1e88f5311fbe7aa58b8dff18dd763 (patch) | |
| tree | 875d14cdc7603da1fba730b2ac419cdb642afd73 /sound/soc/omap/omap-pcm.c | |
| parent | ca6e2ce08679c094878d7f39a0349a7db1d13675 (diff) | |
| download | op-kernel-dev-caebc0cb3ba1e88f5311fbe7aa58b8dff18dd763.zip op-kernel-dev-caebc0cb3ba1e88f5311fbe7aa58b8dff18dd763.tar.gz | |
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>
Diffstat (limited to 'sound/soc/omap/omap-pcm.c')
| -rw-r--r-- | sound/soc/omap/omap-pcm.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c index b9633d5..5735945 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; |
