diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2012-09-14 15:05:52 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-09-22 11:12:59 -0400 |
| commit | 03945e99a8ac4f596dad9a679816e5b4bb77e5d2 (patch) | |
| tree | 51f73408c4f3eefdfd6be05f776ee497beda92da /sound/soc | |
| parent | 061fb36db7c0187aa90b95f1ba56f6192f42b984 (diff) | |
| download | linux-03945e99a8ac4f596dad9a679816e5b4bb77e5d2.tar.bz2 | |
ASoC: omap-pcm: Prepare to configure the DMA data_type based on stream properties
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>
Diffstat (limited to 'sound/soc')
| -rw-r--r-- | sound/soc/omap/omap-pcm.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c index 02eeb2e7ceda..4c13a5f4eebb 100644 --- a/sound/soc/omap/omap-pcm.c +++ b/sound/soc/omap/omap-pcm.c @@ -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); |