From caebc0cb3ba1e88f5311fbe7aa58b8dff18dd763 Mon Sep 17 00:00:00 2001 From: Eduardo Valentin Date: Thu, 20 Aug 2009 16:18:25 +0300 Subject: 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 Acked-by: Jarkko Nikula Signed-off-by: Mark Brown --- sound/soc/omap/omap-pcm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'sound/soc/omap/omap-pcm.c') diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c index b9633d5a955..5735945788b 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; -- cgit v1.2.3