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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the channel is no longer active, we call the omap_dma_callback() to handle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>
This commit is contained in:
Peter Ujfalusi 2015-11-11 12:37:58 +02:00 committed by Vinod Koul
parent 1c1d25f9f9
commit 1a7cf7b26f
1 changed files with 6 additions and 0 deletions
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6
drivers/dma/omap-dma.c
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@ -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/* The channel is no longer active, handle the completion right away */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;