dmaengine: ti: edma: Support for polled (memcpy) completion

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When a DMA client driver does not set the DMA_PREP_INTERRUPT because it
does not want to use interrupts for DMA completion or because it can not
rely on DMA interrupts due to executing the memcpy when interrupts are
disabled it will poll the status of the transfer.

Since we can not tell from any EDMA register that the transfer is
completed, we can only know that the paRAM set has been sent to TPTC for
processing we need to check the residue of the transfer, if it is 0 then
the transfer is completed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20190716082655.1620-4-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Peter Ujfalusi 2019-07-16 11:26:55 +03:00 • committed by Vinod Koul

parent 097ffdc752

commit aa3c6ce4ea

1 changed files with 33 additions and 4 deletions

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drivers/dma/ti/edma.c

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