diff options
| author | Shawn Guo <shawn.guo@freescale.com> | 2011-01-20 05:50:39 +0800 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-01-31 12:42:23 +0100 |
| commit | 341b9419a8c0a4cdb75773c576870f1eb655516d (patch) | |
| tree | cfa8912c361d8cf24a67a8bc560523537769695f | |
| parent | 1e9cebb42de57f1243261939c77ab5b0f9bcf311 (diff) | |
dmaengine: imx-sdma: fix up param for the last BD in sdma_prep_slave_sg()
As per the reference manual, bit "L" should be set while bit "C"
should be cleared for the last buffer descriptor in the non-cyclic
chain, so that sdma can stop trying to find the next BD and end
the transfer.
In case of sdma_prep_slave_sg(), BD_LAST needs to be set and BD_CONT
be cleared for the last BD.
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | drivers/dma/imx-sdma.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index cf93d1737f1..4535f98b355 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -931,8 +931,11 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( param = BD_DONE | BD_EXTD | BD_CONT; - if (i + 1 == sg_len) + if (i + 1 == sg_len) { param |= BD_INTR; + param |= BD_LAST; + param &= ~BD_CONT; + } dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n", i, count, sg->dma_address, |