dmaengine/ep93xx_dma: Implement double buffering for M2M DMA channels
Add double buffering support for M2M DMA channels. Implement this by using EP93xx M2M DMA Buffer and Control Finite State Machines to be sure that we are not disabling the channel when it's actually operating. Signed-off-by: NRafal Prylowski <prylowski@metasoft.pl> Tested-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: NMika Westerberg <mika.westerberg@iki.fi> Signed-off-by: NRyan Mallon <rmallon@gmail.com>
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