linux-kernel - Re: [patch] split MMC_CAP_4_BIT

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Message-Id: <200801120802.37259.rgetz@blackfin.uclinux.org>
Date:	Sat, 12 Jan 2008 08:02:37 -0500
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Pierre Ossman" <drzeus-mmc@...eus.cx>
Cc:	"Mike Frysinger" <vapier.adi@...il.com>,
	"Bryan Wu" <cooloney.lkml@...il.com>,
	"Cai, Cliff" <Cliff.Cai@...log.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch] split MMC_CAP_4_BIT_DATA

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.

So I guess this is back on Bryan/Cliff to make work....

Thanks for pushing back.

-Robin
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