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authorMuhammad Hamza Farooq <mfarooq@visteon.com>2016-06-30 18:15:15 +0300
committerVinod Koul <vinod.koul@intel.com>2016-07-08 08:39:10 +0300
commit3544d2878817bd139dda238cdd86a15e1c03d037 (patch)
tree765e3e0376280b905dba65afc2ed8e008def31c7 /drivers/dma/sh
parent3565fe53334cd3f0d59ff5db0872de9370775a19 (diff)
downloadlinux-3544d2878817bd139dda238cdd86a15e1c03d037.tar.xz
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>
Diffstat (limited to 'drivers/dma/sh')
-rw-r--r--drivers/dma/sh/rcar-dmac.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 433e98260414..74c9563222bc 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -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;