Messages in this thread | | | Date | Thu, 12 Apr 2012 00:05:58 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH 2/2 v2] dma/amba-pl08x: add support for the Nomadik variant |
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On Thu, Apr 12, 2012 at 01:00:14AM +0200, Linus Walleij wrote: > The Nomadik PL080 variant has some extra protection bits that > may be set, so we need to check these bits to see if the > channels are actually available for the DMAengine to use.
Actually, there is another issue to be considered with PL080. For memcpy transfers, a restricted set of channels should be used, because the PL080 only guarantees certain channels won't consume all bus bandwidth, locking out (eg) the CPU from doing other stuff while the memcpy DMA is running.
So really the way physical channels are selected needs to become more inteligent overall.
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