On Thu, 30 Jul 2009 15:49:39 +0300 Eduardo Valentin eduardo.valentin@nokia.com wrote:
Now this patch implements again the McBSP threshold usage for OMAP ASoC.
We figured out that 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
sound/soc/omap/omap-pcm.c | 37 +++++++++++++++++++++++++++++++++++-- 1 files changed, 35 insertions(+), 2 deletions(-)
@@ -192,6 +203,12 @@ 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 (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)omap_mcbsp_set_tx_threshold(bus_id, samples - 1);elseomap_mcbsp_set_rx_threshold(bus_id, samples - 1);- omap_start_dma(prtd->dma_ch); break;
Oops, didn't notice this before. This will hard glue the DMA and McBSP together. Even currently there is only McBSP based DAI link driver, there can be others as well. EAC DAI for OMAP2420 would be necessary for instance if one wants to develop ASoC support for Nokia N800. Nokia N810 could use that too.