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ASoC: Add new parameter to s3c24xx_pcm_enqueue

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The S3C24xx dma does not allow more than one buffer to be enqueue prior to
the dma transfers starting. This patch adds an additional parameter to
s3c24xx_pcm_enqueue() to allow for passing an initial dma maximum load
value.

Signed-off-by: David Anders <danders at amltd.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
David Anders 2008-11-05 07:39:47 -08:00 committed by Mark Brown
parent ea913940c3
commit 8dc840f88d
1 changed files with 8 additions and 4 deletions
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12
sound/soc/s3c24xx/s3c24xx-pcm.c
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@ -78,7 +78,8 @@ struct s3c24xx_runtime_data {
* place a dma buffer onto the queue for the dma system * place a dma buffer onto the queue for the dma system
* to handle. * to handle.
*/ */
static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream) static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream,
int dma_max)
{ {
struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
dma_addr_t pos = prtd->dma_pos; dma_addr_t pos = prtd->dma_pos;
@ -86,7 +87,10 @@ static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
DBG("Entered %s\n", __func__); DBG("Entered %s\n", __func__);
while (prtd->dma_loaded < prtd->dma_limit) { if (!dma_max)
dma_max = prtd->dma_limit;
while (prtd->dma_loaded < dma_max) {
unsigned long len = prtd->dma_period; unsigned long len = prtd->dma_period;
DBG("dma_loaded: %d\n", prtd->dma_loaded); DBG("dma_loaded: %d\n", prtd->dma_loaded);
@ -132,7 +136,7 @@ static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
spin_lock(&prtd->lock); spin_lock(&prtd->lock);
if (prtd->state & ST_RUNNING) { if (prtd->state & ST_RUNNING) {
prtd->dma_loaded--; prtd->dma_loaded--;
s3c24xx_pcm_enqueue(substream); s3c24xx_pcm_enqueue(substream, 0);
} }
spin_unlock(&prtd->lock); spin_unlock(&prtd->lock);
@ -249,7 +253,7 @@ static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
prtd->dma_pos = prtd->dma_start; prtd->dma_pos = prtd->dma_start;
/* enqueue dma buffers */ /* enqueue dma buffers */
s3c24xx_pcm_enqueue(substream); s3c24xx_pcm_enqueue(substream, 1);
return ret; return ret;
} }