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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2015-11-11 12:37:58 +0200
committerVinod Koul <vinod.koul@intel.com>2015-12-05 13:36:38 +0530
commit1a7cf7b26f2594bb1c622f76765f77d3a5140293 (patch)
tree8648908a2e44c4685a0dadc4d67d66e3599df75f
parent1c1d25f9f933211b622b0e209716372480051361 (diff)
downloadlinux-1a7cf7b26f2594bb1c622f76765f77d3a5140293.tar.bz2
dmaengine: omap-dma: Handle cases when the channel is polled for completion
When a DMA client driver decides that it is not providing callback for completion of a transfer (and/or does not set the DMA_PREP_INTERRUPT) but it will poll the status of the transfer (in case of short memcpy for example) we will not get interrupt for the completion of the transfer and will not mark the transaction as done. Check the channel enable bit in the CCR when the status is queried and if the channel is no longer active, we call the omap_dma_callback() to handle the transfer completion. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
-rw-r--r--drivers/dma/omap-dma.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 4e4642f561f5..f86827ac0c8a 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -673,8 +673,14 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
struct omap_chan *c = to_omap_dma_chan(chan);
struct virt_dma_desc *vd;
enum dma_status ret;
+ uint32_t ccr;
unsigned long flags;
+ ccr = omap_dma_chan_read(c, CCR);
+ /* The channel is no longer active, handle the completion right away */
+ if (!(ccr & CCR_ENABLE))
+ omap_dma_callback(c->dma_ch, 0, c);
+
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;