Re: [PATCH mmc/next v3 0/4] mmc: renesas_sdhi: add support for R-Car Gen3 SDHI DMAC

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On Mon, Jun 26, 2017 at 10:16:50PM +0200, Wolfram Sang wrote:
> 
> > this series adds support for the internal DMAC used by r8a779[56] SoCs.
> > This is achieved by adding a new variant of the SDHI driver for this
> > DMA controller with compat strings for the r8a779[56] SoCs.
> > Compat strings for these SoCs are also removed from the existing SYS DMAC
> > variant of the SDHI driver.
> 
> Okay, I tested some more today. My conclusion is that the series works
> so far. However, it quite often triggers a SDR50 retune with one card.
> And that sends an explicit CMD12 which we don't handle well. I always
> suspected the code to be imperfect, now I have a proof. So, that is a
> good thing but seems unrelated to this series to me.
> 
> Another card does not retune and works flawlessly.
> 
> I will sleep over it, re-test tomorrow and if my findings will get
> confirmed, then I'll give my Reviewed-by tags to this series.

I could successfully move around big files on Lager/H2 and
Salvator-X/M3-W with multiple cards. The md5sum of the files matched.

The transfer speedups match Simon's numbers.

On M3-W, one card has problems because it wants to retune and that
causes problems independently of this DMA driver. M3-W works fine with
other cards. The card in question works fine with H2.

Tested-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

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