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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>
hifive-unleashed-5.1
Shawn Guo 2011-01-20 05:50:39 +08:00 committed by Sascha Hauer
parent 1e9cebb42d
commit 341b9419a8
1 changed files with 4 additions and 1 deletions
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5
drivers/dma/imx-sdma.c
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@ -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,