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SubjectRE: A MMC card transfer issue
Date
Hi Philip,

> which MMC driver are you using.
According to boot message, it seems sdhci.c is loaded.

Do I add only "mmc->caps |= MMC_CAP_BUS_WIDTH_TEST" in sdhc.c ?

Thanks,
-----------------------------------------
Tomoya MORINAGA
OKI SEMICONDUCTOR CO., LTD.

> -----Original Message-----
> From: Philip Rakity [mailto:prakity@marvell.com]
> Sent: Thursday, January 27, 2011 10:44 AM
> To: Tomoya MORINAGA
> Cc: Chris Ball; Kyungmin Park; linux-mmc@vger.kernel.org;
> linux-kernel@vger.kernel.org;
> andrew.chih.howe.khor@intel.com; kok.howg.ewe@intel.com;
> Toshiharu Okada
> Subject: Re: A MMC card transfer issue
>
>
> There is no good answer.
>
> Doing this patch for 2.6.20 or so a long time ago had
> problems because some controllers did not work. The failures
> were equally unpleasant.
>
> The failure you see today is at least not a regression since
> 1 bit did not work before.
>
> We hope that developers who know their h/w works add the CAP.
>
>
> On Jan 26, 2011, at 5:31 PM, Tomoya MORINAGA wrote:
>
> > Hi Philip,
> >
> >> which MMC driver are you using.
> > Could you teach me how to get the information ?
> >
> >> you need to have the driver or the low level code enable
> this QUIRK.
> > BTW, Is the above permanent treatment?
> > I think modifying kernel source code isn't preferred.
> >
> > Thanks,
> > -----------------------------------------
> > Tomoya MORINAGA
> > OKI SEMICONDUCTOR CO., LTD.
> >
> >> -----Original Message-----
> >> From: Philip Rakity [mailto:prakity@marvell.com]
> >> Sent: Thursday, January 27, 2011 10:04 AM
> >> To: Tomoya MORINAGA
> >> Cc: Chris Ball; Kyungmin Park; linux-mmc@vger.kernel.org;
> >> linux-kernel@vger.kernel.org; andrew.chih.howe.khor@intel.com;
> >> kok.howg.ewe@intel.com
> >> Subject: Re: A MMC card transfer issue
> >>
> >>
> >> yes
> >>
> >> you need to have the driver or the low level code enable
> this QUIRK.
> >>
> >> which mmc driver are you using.
> >>
> >> On Jan 26, 2011, at 5:00 PM, Tomoya MORINAGA wrote:
> >>
> >>> Hi Philip,
> >>>
> >>> On Thursday, January 27, 2011 12:42 AM, Philip Rakity wrote:
> >>>> Did you define the CAP for BUS WIDTH ?
> >>>>
> >>>> MMC_CAP_BUS_WIDTH_TEST
> >>>>
> >>>> in the driver or the platform driver ?
> >>>
> >>> Let me make the above meaning clear.
> >>>
> >>> I don't modify kernel source code "drivers/mmc" at all Is
> the above
> >>> mean I must modify something kernel source code ?
> >>>
> >>> Thanks,
> >>> -----------------------------------------
> >>> Tomoya MORINAGA
> >>> OKI SEMICONDUCTOR CO., LTD.
> >>>
> >>
> >
>



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