From: Muhammad Hamza Farooq <mfar...@visteon.com>
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 <mfar...@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be>
[Niklas: add explanation in commit message]
Signed-off-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
---
drivers/dma/sh/rcar-dmac.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index dfb1792..791a064 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;
--
2.8.3
