[PATCH] mmc: mxs-mmc: add support for pre_req and post_req

[Per Forlin]

On 17 April 2011 18:48, Shawn Guo <shawn.guo at freescale.com> wrote:
> On Mon, Apr 18, 2011 at 12:33:30AM +0800, Shawn Guo wrote:
>> pre_req() runs dma_map_sg() post_req() runs dma_unmap_sg.
>> If not calling pre_req() before mxs_mmc_request(), request()
>> will prepare the cache just like it did it before.
>> It is optional to use pre_req() and post_req().
>>
>> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
>> ---
>>  drivers/mmc/host/mxs-mmc.c |   75 ++++++++++++++++++++++++++++++++++++++++++--
>>  1 files changed, 72 insertions(+), 3 deletions(-)
>>
>
> Here is the result of mmc_test case 37 ~ 40, which are designed to see
> the performance improvement introduced by non-blocking changes.
>
> Honestly, the improvement is not so impressive.  Not sure if the patch
> for mxs-mmc pre_req and post_req support was correctly produced.  So
> please help review ...
My guess is that dma_unmap is not run in parallel with transfer.
Please look at my patch reply.

>
> --
> Regards,
> Shawn
Regards,
Per