linux-kernel - Re: [patch] split MMC_CAP_4_BIT

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Date:	Sat, 12 Jan 2008 23:24:56 +0800
From:	"Bryan Wu" <cooloney.lkml@...il.com>
To:	"Robin Getz" <rgetz@...ckfin.uclinux.org>
Cc:	"Pierre Ossman" <drzeus-mmc@...eus.cx>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	"Cai, Cliff" <Cliff.Cai@...log.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch] split MMC_CAP_4_BIT_DATA

On Jan 12, 2008 9:02 PM, Robin Getz <rgetz@...ckfin.uclinux.org> wrote:
> On Fri 11 Jan 2008 12:52, Robin Getz pondered:
>
> > On Fri 11 Jan 2008 04:35, Pierre Ossman pondered:
> > > On Fri, 11 Jan 2008 04:08:53 -0500
> > > "Mike Frysinger" <vapier.adi@...il.com> wrote:
> > >
> > > > On Jan 11, 2008 3:40 AM, Pierre Ossman <drzeus-mmc@...eus.cx> wrote:
> > > > > So it's far more probable that you've misdiagnosed your error than
> > > this being the actual problem.
> > > >
> > > > the guys who design the silicon are telling us it doesnt work.  our
> > > > tests show it not working.  i'm not sure what else you want here.
> > > >
> > >
> > > More information. You have not provided any speculation as to why it
> > > doesn't work, or what you've done to figure it out.
> >
> > I have been trying to get the detailed information from the hardware
> > (silicon designer) guy about why he believes support for 4-bit MMC is
> > not there, but I have not heard back yet.
> >
> > As soon as I hear from them - and either understand why 4-bit MMC doesn't
> > work, or if the Blackfin docs are incorrect (either is OK outcome) - I will
> > let you know.
>
> According to the HW folks - it is exactly as Pierre indicated - in theory it
> should work, 4-bit MMC requires usage of different set of commands as
> compared to 4-bit SD, so it should be just software - although no one has
> tested it yet.
>

Vivi is helping us to do the test again, and she will fire a bug
tracker about this issue next week.
So we can debug it again.

> So I guess this is back on Bryan/Cliff to make work....
>
> Thanks for pushing back.
>

Yes, Thanks a lot Pierre.
-Bryan Wu
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