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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>
This commit is contained in:
Yoshihiro Shimoda 2018-07-11 11:10:15 +09:00 committed by Vinod Koul
parent 538603c602
commit 4de1247a98
1 changed files with 12 additions and 5 deletions
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17
drivers/dma/sh/rcar-dmac.c
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@ -759,6 +759,17 @@ 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_clear_chcr_de(struct rcar_dmac_chan *chan)
{
u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
/* 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);
@ -766,11 +777,7 @@ static void rcar_dmac_sync_tcr(struct rcar_dmac_chan *chan)
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);
rcar_dmac_clear_chcr_de(chan);
/* back DE if remain data exists */
if (rcar_dmac_chan_read(chan, RCAR_DMATCR))