Re: [PATCH] dma: sun4i: expose block size and wait cycle configuration to DMA users

From: Boris Brezillon
Date: Wed Mar 09 2016 - 06:23:53 EST

On Tue, 8 Mar 2016 08:25:47 +0530
Vinod Koul <vinod.koul@xxxxxxxxx> wrote:
> Why does dmaengine need to wait? Can you explain that

I don't have an answer for that one, but when I set WAIT_CYCLES to 1
for the NAND use case it does not work. So I guess it is somehow
related to how the DRQ line is controlled on the device side...

Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering