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| author | Muhammad Hamza Farooq <mfarooq@visteon.com> | 2016-06-30 17:15:15 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-07-08 11:09:10 +0530 |
| commit | 3544d2878817bd139dda238cdd86a15e1c03d037 (patch) | |
| tree | 765e3e0376280b905dba65afc2ed8e008def31c7 /drivers/dma/sh | |
| parent | 3565fe53334cd3f0d59ff5db0872de9370775a19 (diff) | |
| download | linux-rt-3544d2878817bd139dda238cdd86a15e1c03d037.tar.gz | |
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.c | 4 |
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; |