mmc: sdhci: convert ADMA descriptors to a coherent allocation
Rather than using the streaming API, use the coherent allocator to provide this memory, thereby eliminating cache flushing of it each time we map and unmap it. This results in a 7.5% increase in transfer speed with a UHS-1 card operating in 3.3v mode at a clock of 49.5MHz. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk> Tested-by: NMarkus Pargmann <mpa@pengutronix.de> Tested-by: NStephen Warren <swarren@nvidia.com> Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org> Signed-off-by: NChris Ball <chris@printf.net>
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