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ASoC: MPC5200: Support for buffer wrap around

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The code in psc_dma_bcom_enqueue_tx() didn't account for the fact that
s->runtime->control->appl_ptr can wrap around to the beginning of the
buffer. This change fixes this problem.

Signed-off-by: John Bonesio <bones@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
John Bonesio 2009-07-29 08:38:55 -07:00 committed by Mark Brown
parent 4bc4c9a5f5
commit b0a2712ffd
1 changed files with 17 additions and 0 deletions
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17
sound/soc/fsl/mpc5200_dma.c
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@ -69,6 +69,23 @@ static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)
{
if (s->appl_ptr > s->runtime->control->appl_ptr) {
/*
* In this case s->runtime->control->appl_ptr has wrapped around.
* Play the data to the end of the boundary, then wrap our own
* appl_ptr back around.
*/
while (s->appl_ptr < s->runtime->boundary) {
if (bcom_queue_full(s->bcom_task))
return;
s->appl_ptr += s->period_size;
psc_dma_bcom_enqueue_next_buffer(s);
}
s->appl_ptr -= s->runtime->boundary;
}
while (s->appl_ptr < s->runtime->control->appl_ptr) {
if (bcom_queue_full(s->bcom_task))