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ASoC/mpc5200: Track DMA position by period number instead of bytes

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All DMA blocks are lined up to period boundaries, but the DMA
handling code tracks bytes instead.  This patch reworks the code
to track the period index into the DMA buffer instead of the
physical address pointer.  Doing so makes the code simpler and
easier to understand.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Grant Likely
2009-11-07 01:33:53 -07:00
committed by Mark Brown
parent 4cae37fa98
commit 8f159d720b
2 changed files with 11 additions and 25 deletions
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8
sound/soc/fsl/mpc5200_dma.h
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@@ -13,7 +13,6 @@
* @psc_dma: pointer back to parent psc_dma data structure
* @bcom_task: bestcomm task structure
* @irq: irq number for bestcomm task
* @period_start: physical address of start of DMA region
* @period_end: physical address of end of DMA region
* @period_next_pt: physical address of next DMA buffer to enqueue
* @period_bytes: size of DMA period in bytes
@@ -27,12 +26,9 @@ struct psc_dma_stream {
struct bcom_task *bcom_task;
int irq;
struct snd_pcm_substream *stream;
dma_addr_t period_start;
dma_addr_t period_end;
dma_addr_t period_next_pt;
dma_addr_t period_current_pt;
int period_next;
int period_current;
int period_bytes;
int period_size;
};
/**