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ASoC: omap-pcm: Prepare to configure the DMA data_type based on stream properties

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Based on the format of the stream the omap-pcm can decide alone what data
type should be used with by the sDMA.
Keep the possibility for OMAP dai drivers to tell omap-pcm if they want to
use different data type. This is needed for the omap-hdmi for example which
needs 32bit data type even if the stream format is S16_LE.

The check if (dma_data->data_type) is safe at the moment since omap-pcm
does not support 8bit samples (OMAP_DMA_DATA_TYPE_S8 == 0x00).

The next step is to redefine the meaning of dma_data->data_type to unblock
this limitation.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Peter Ujfalusi 2012-09-14 15:05:52 +03:00 committed by Mark Brown
parent 061fb36db7
commit 03945e99a8
1 changed files with 29 additions and 2 deletions
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31
sound/soc/omap/omap-pcm.c
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@ -149,6 +149,24 @@ static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
return 0;
}
static int omap_pcm_get_dma_type(int num_bits)
{
int data_type;
switch (num_bits) {
case 16:
data_type = OMAP_DMA_DATA_TYPE_S16;
break;
case 32:
data_type = OMAP_DMA_DATA_TYPE_S32;
break;
default:
data_type = -EINVAL;
break;
}
return data_type;
}
static int omap_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@ -163,7 +181,16 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
return 0;
memset(&dma_params, 0, sizeof(dma_params));
dma_params.data_type = dma_data->data_type;
if (dma_data->data_type)
dma_params.data_type = dma_data->data_type;
else
dma_params.data_type = omap_pcm_get_dma_type(
snd_pcm_format_physical_width(runtime->format));
if (dma_params.data_type < 0)
return dma_params.data_type;
dma_params.trigger = dma_data->dma_req;
if (dma_data->packet_size)
@ -195,7 +222,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
* still can get an interrupt at each period bounary
*/
bytes = snd_pcm_lib_period_bytes(substream);
dma_params.elem_count = bytes >> dma_data->data_type;
dma_params.elem_count = bytes >> dma_params.data_type;
dma_params.frame_count = runtime->periods;
omap_set_dma_params(prtd->dma_ch, &dma_params);