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ASoC: DaVinci: McASP FIFO related updates

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The DMA params for McASP with FIFO has been updated so that it works for
various FIFO levels. A member- 'fifo_level' has been added to the DMA
params data structure. The fifo_level can be adjusted by the tx[rx]_numevt
platform data. This is relevant only for DA8xx/OMAP-L1xx platforms. This
implementation has been tested for numevt values 1, 2, 4, 8.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Chaithrika U S
2009-09-30 17:32:27 -04:00
committed by Mark Brown
parent be2500b835
commit 4fa9c1a595
4 changed files with 28 additions and 13 deletions
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17
sound/soc/davinci/davinci-mcasp.c
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@@ -714,16 +714,13 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
struct davinci_pcm_dma_params *dma_params =
&dev->dma_params[substream->stream];
int word_length;
u8 numevt;
u8 fifo_level;
davinci_hw_common_param(dev, substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
numevt = dev->txnumevt;
fifo_level = dev->txnumevt;
else
numevt = dev->rxnumevt;
if (!numevt)
numevt = 1;
fifo_level = dev->rxnumevt;
if (dev->op_mode == DAVINCI_MCASP_DIT_MODE)
davinci_hw_dit_param(dev);
@@ -751,12 +748,12 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}
if (dev->version == MCASP_VERSION_2) {
dma_params->data_type *= numevt;
dma_params->acnt = 4 * numevt;
} else
if (dev->version == MCASP_VERSION_2 && !fifo_level)
dma_params->acnt = 4;
else
dma_params->acnt = dma_params->data_type;
dma_params->fifo_level = fifo_level;
davinci_config_channel_size(dev, word_length);
return 0;