RE: [RFC 0/6] mmc: sdhi: add basic r8a7795 support

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> From: Dirk Behme
> Sent: Friday, January 22, 2016 8:31 PM
> 
> On 22.01.2016 11:32, Yoshihiro Shimoda wrote:
> > Hi Dirk-san, Wolfram-san,
> >
> >>> And third, from reading the r8a7795 manual I think the manual talks about
> >>>
> >>> https://github.com/dirkbehme/linux-renesas-rcar-gen3/commit/f2a727c859916d59dca85dbb72c1b61da3fd6da0
> >>>
> >>> But testing this it doesn't work. So either the manual is wrong, or I missed
> >>> anything else.
> >>
> >> I have seen this patch and my gut feeling is that it won't make a
> >> difference? SCLKDIVEN is like CBUSY plus some more cycles AFAIU. But I
> >> am not working on DMA issues now, this has to wait.
> >
> > I'm not sure we have to use CBSY bit instead of SCLKDIVEN on r8a7795.
> 
> 
> The r8a7795 manual I have has several
> 
> "Do / Do not xxx when the CBSY bit in SD_INFO2 is set to x"
> 
> It always talks about CBSY, not SCLKDIVEN.

Thank you for the detail. I agree with you about r8a7795.
However, on previous SoC, it doesn't have CBSY bit.
So, I guess we have to keep compatible for previous SoC somehow.

Best regards,
Yoshihiro Shimoda

> Best regards
> 
> Dirk



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