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dmaengine: pl330: Handle xferred count if DMAMOV hasn't finished 

After executing DMAGO it's possible that a request can come in for the
current xferred count, but if that happens too soon then DMAMOV SAR/DAR
may not have yet completed. If that happens, we should explicitly return 0
since nothing has been transferred yet.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Stephen Barber 2016-11-01 16:44:27 -07:00 committed by Vinod Koul
parent 9a1a34f3c8
commit c44da03dd5
1 changed files with 5 additions and 0 deletions
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5
drivers/dma/pl330.c
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@ -2263,6 +2263,11 @@ static int pl330_get_current_xferred_count(struct dma_pl330_chan *pch,
}
pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
pm_runtime_put_autosuspend(pl330->ddma.dev);
/* If DMAMOV hasn't finished yet, SAR/DAR can be zero */
if (!val)
return 0;
return val - addr;
}