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dmaengine: rcar-dmac: clear channel register when error

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We need to clear channel register in error case as recovery.
The channel is already stopped in such case, thus we don't need to call
rcar_dmac_chan_halt() before clearing.

rcar_dmac_chan_halt() will clear and confirm DE bit.
But it will be failed because channel is already stopped in error case.
In other words, we shouldn't call it then.

Reported-by: Hiroki Negishi <hiroki.negishi.bx@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Hiroki Negishi <hiroki.negishi.bx@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Kuninori Morimoto 2018-07-03 00:29:29 +00:00 committed by Vinod Koul
parent 45c9a603a4
commit e919417bd6
1 changed files with 9 additions and 1 deletions
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10
drivers/dma/sh/rcar-dmac.c
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@ -1522,7 +1522,15 @@ static irqreturn_t rcar_dmac_isr_channel(int irq, void *dev)
chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
if (chcr & RCAR_DMACHCR_CAE) {
rcar_dmac_chan_halt(chan);
struct rcar_dmac *dmac = to_rcar_dmac(chan->chan.device);
/*
* We don't need to call rcar_dmac_chan_halt()
* because channel is already stopped in error case.
* We need to clear register and check DE bit as recovery.
*/
rcar_dmac_write(dmac, RCAR_DMACHCLR, 1 << chan->index);
rcar_dmac_chcr_de_barrier(chan);
reinit = true;
goto spin_lock_end;
}