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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2018-07-11 11:10:15 +0900
committerVinod Koul <vkoul@kernel.org>2018-07-11 10:47:30 +0530
commit4de1247a9826cec0ba054479124bd9aa60fb71a5 (patch)
tree3152792c67475f7084de8a52c828523ed32348a6 /drivers/dma/sh
parent538603c6026ce769eec633bb79349f5f287519c7 (diff)
dmaengine: sh: rcar-dmac: add a new function to clear CHCR.DE with barrier
This patch adds a new function rcar_dmac_clear_chcr_de() to simplify adding pause function later. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/sh')
-rw-r--r--drivers/dma/sh/rcar-dmac.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 9906a9c7220b..d3b7388645bc 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -759,18 +759,25 @@ static void rcar_dmac_chcr_de_barrier(struct rcar_dmac_chan *chan)
dev_err(chan->chan.device->dev, "CHCR DE check error\n");
}
-static void rcar_dmac_sync_tcr(struct rcar_dmac_chan *chan)
+static void rcar_dmac_clear_chcr_de(struct rcar_dmac_chan *chan)
{
u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
- if (!(chcr & RCAR_DMACHCR_DE))
- return;
-
/* set DE=0 and flush remaining data */
rcar_dmac_chan_write(chan, RCAR_DMACHCR, (chcr & ~RCAR_DMACHCR_DE));
/* make sure all remaining data was flushed */
rcar_dmac_chcr_de_barrier(chan);
+}
+
+static void rcar_dmac_sync_tcr(struct rcar_dmac_chan *chan)
+{
+ u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
+
+ if (!(chcr & RCAR_DMACHCR_DE))
+ return;
+
+ rcar_dmac_clear_chcr_de(chan);
/* back DE if remain data exists */
if (rcar_dmac_chan_read(chan, RCAR_DMATCR))