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dmaengine: rcar-dmac: use result of updated get_residue in tx_status 

The hardware might have complete the transfer but the interrupt handler
might not have had a chance to run. If rcar_dmac_chan_get_residue()
which reads HW registers finds that there is no residue return
DMA_COMPLETE.

Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
[Niklas: add explanation in commit message]
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:
Muhammad Hamza Farooq 2016-06-30 17:15:15 +02:00 committed by Vinod Koul
parent 3565fe5333
commit 3544d28788
1 changed files with 4 additions and 0 deletions
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4
drivers/dma/sh/rcar-dmac.c
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@ -1202,6 +1202,10 @@ static enum dma_status rcar_dmac_tx_status(struct dma_chan *chan,
residue = rcar_dmac_chan_get_residue(rchan, cookie);
spin_unlock_irqrestore(&rchan->lock, flags);
/* if there's no residue, the cookie is complete */
if (!residue)
return DMA_COMPLETE;
dma_set_residue(txstate, residue);
return status;