[PATCH 1/3] spi/qspi: Add memory mapped read support.

[Mark Brown]

On Thu, Oct 17, 2013 at 05:54:53PM +0530, Sourav Poddar wrote:

>   Setup:
>     Here, the actual memcpy is done in the spi controller, and flash
>     communicates to the qspi controller to do the memcpy using the
>     SPI framework. This is what is propsed in the $subject patch.

>   Setup:
>     Here, the actual memcpy is done in the mtd read api itself, by
> getting the
>     memmap address from the spi controller.

> So, time reduced almost to half while bypassing the SPI framework.

The interesting case for benchmarking here is more a comparison between
normal DMA driven transfers and the memcpy().  Some consideration of the
CPU load would also be interesting here, if the SoC is waiting for the
flash then it's probably useful if it can make progress on other things.
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