linux-kernel - [PATCH 07/10] MXS-DMA : change the last parameter of mxs_dma_prep_slave

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Date:	Thu, 19 Jan 2012 14:16:04 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	<vinod.koul@...el.com>
CC:	<shawn.guo@...aro.org>, <artem.bityutskiy@...el.com>,
	<shijie8@...il.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mtd@...ts.infradead.org>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <w.sang@...gutronix.de>,
	<LW@...O-electronics.de>, <alsa-devel@...a-project.org>,
	<b29396@...escale.com>, Huang Shijie <b32955@...escale.com>
Subject: [PATCH 07/10] MXS-DMA : change the last parameter of mxs_dma_prep_slave_sg()

Rewrite the last parameter of mxs_dma_prep_slave_sg().
Add some more flags to let the driver sets the flags as it needs,
such as WAIT4END bit.

Signed-off-by: Huang Shijie <b32955@...escale.com>
---
 drivers/dma/mxs-dma.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index c80fbed..cfcb8d8 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -352,7 +352,7 @@ static void mxs_dma_free_chan_resources(struct dma_chan *chan)
 static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
 		struct dma_chan *chan, struct scatterlist *sgl,
 		unsigned int sg_len, enum dma_transfer_direction direction,
-		unsigned long append)
+		unsigned long flags)
 {
 	struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
 	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
@@ -360,6 +360,7 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
 	struct scatterlist *sg;
 	int i, j;
 	u32 *pio;
+	bool append = flags & MXS_DMA_F_APPEND;
 	int idx = append ? mxs_chan->desc_count : 0;
 
 	if (mxs_chan->status == DMA_IN_PROGRESS && !append)
@@ -386,7 +387,6 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
 		ccw->bits |= CCW_CHAIN;
 		ccw->bits &= ~CCW_IRQ;
 		ccw->bits &= ~CCW_DEC_SEM;
-		ccw->bits &= ~CCW_WAIT4END;
 	} else {
 		idx = 0;
 	}
@@ -401,7 +401,8 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
 		ccw->bits = 0;
 		ccw->bits |= CCW_IRQ;
 		ccw->bits |= CCW_DEC_SEM;
-		ccw->bits |= CCW_WAIT4END;
+		if (flags & MXS_DMA_F_WAIT4END)
+			ccw->bits |= CCW_WAIT4END;
 		ccw->bits |= CCW_HALT_ON_TERM;
 		ccw->bits |= CCW_TERM_FLUSH;
 		ccw->bits |= BF_CCW(sg_len, PIO_NUM);
@@ -432,7 +433,8 @@ static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
 				ccw->bits &= ~CCW_CHAIN;
 				ccw->bits |= CCW_IRQ;
 				ccw->bits |= CCW_DEC_SEM;
-				ccw->bits |= CCW_WAIT4END;
+				if (flags & MXS_DMA_F_WAIT4END)
+					ccw->bits |= CCW_WAIT4END;
 			}
 		}
 	}
-- 
1.7.0.4


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