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dma: imx-sdma: buf_tail should be initialize in prepare function

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This fix audio underrun issue. When SNDRV_PCM_TRIGGER_STOP
and SNDRV_PCM_TRIGGER_START, it calls prepare again. buf_tail
should be reset to zero.
So move buf_tail initialization into prepare function.

Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Richard Zhao 2012-06-04 09:17:24 +08:00 committed by Vinod Koul
parent 30c1dc0ff3
commit 8e2e27c744
1 changed files with 4 additions and 2 deletions
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6
drivers/dma/imx-sdma.c
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@ -815,8 +815,6 @@ static int sdma_request_channel(struct sdma_channel *sdmac)
init_completion(&sdmac->done);
sdmac->buf_tail = 0;
return 0;
out:
@ -927,6 +925,8 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
sdmac->flags = 0;
sdmac->buf_tail = 0;
dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
sg_len, channel);
@ -1027,6 +1027,8 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
sdmac->status = DMA_IN_PROGRESS;
sdmac->buf_tail = 0;
sdmac->flags |= IMX_DMA_SG_LOOP;
sdmac->direction = direction;
ret = sdma_load_context(sdmac);