Commit 341b9419 authored Jan 20, 2011 by Shawn Guo Committed by Sascha Hauer Jan 31, 2011

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>

parent 1e9cebb4

drivers/dma/imx-sdma.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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,