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From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: linux-sh@vger.kernel.org
Subject: RE: [RFC 0/6] mmc: sdhi: add basic r8a7795 support
Date: Mon, 25 Jan 2016 08:51:02 +0000	[thread overview]
Message-ID: <SG2PR06MB0919291EBA454C6887750692D8C70@SG2PR06MB0919.apcprd06.prod.outlook.com> (raw)
In-Reply-To: <1453220461-2598-1-git-send-email-wsa@the-dreams.de>

> 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

  parent reply	other threads:[~2016-01-25  8:51 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-19 16:20 [RFC 0/6] mmc: sdhi: add basic r8a7795 support Wolfram Sang
2016-01-19 16:56 ` Dirk Behme
2016-01-22  8:54 ` Wolfram Sang
2016-01-22 10:32 ` Yoshihiro Shimoda
2016-01-22 11:26 ` Dirk Behme
2016-01-22 11:30 ` Dirk Behme
2016-01-22 11:36 ` Dirk Behme
2016-01-22 21:30 ` Wolfram Sang
2016-01-25  8:51 ` Yoshihiro Shimoda [this message]
2016-01-25  9:08 ` Dirk Behme
2016-01-25 16:25 ` Dirk Behme
2016-01-25 19:24 ` Wolfram Sang
2016-01-25 20:47 ` Geert Uytterhoeven
2016-01-26  6:12 ` Dirk Behme
2016-01-26  8:34 ` Wolfram Sang

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