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dmaengine: rcar-dmac: warn if transfer cannot start as TE = 1 

The documentation states one should make sure both DE and TE are cleared
before starting a transaction. This patch extends the current warning to
look at both DE and TE.

Based on previous work from Muhammad Hamza Farooq.

Suggested-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Niklas Söderlund 2016-06-30 17:15:16 +02:00 committed by Vinod Koul
parent 3544d28788
commit 0f78e3b58f
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/sh/rcar-dmac.c
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@ -311,7 +311,7 @@ static bool rcar_dmac_chan_is_busy(struct rcar_dmac_chan *chan)
{ {
u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR); u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
return (chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE)) == RCAR_DMACHCR_DE; return !!(chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE));
} }
static void rcar_dmac_chan_start_xfer(struct rcar_dmac_chan *chan) static void rcar_dmac_chan_start_xfer(struct rcar_dmac_chan *chan)