Commit 4de1247a authored by Yoshihiro Shimoda's avatar Yoshihiro Shimoda Committed by Vinod Koul
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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: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 538603c6

drivers/dma/sh/rcar-dmac.c

+11 −4
Original line number Diff line number Diff line
@@ -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))