linux-kernel - Re: [patch] split MMC_CAP_4_BIT

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Message-ID: <20080111110505.615ae436@poseidon.drzeus.cx>
Date:	Fri, 11 Jan 2008 11:05:05 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	"Mike Frysinger" <vapier.adi@...il.com>
Cc:	"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 04:47:44 -0500
"Mike Frysinger" <vapier.adi@...il.com> wrote:

> Cliff should be able to enumerate the cards he has tested and the
> issues he's run into.  i'll see if i cant get more in depth
> information from the hardware guys beyond the documentation on the sdh
> already available in the hardware manual (which i'm guessing has not
> been enough to appease you).
> 

Great. And you're right in that the spec did not give any indication that MMC shouldn't work.

I did notice one thing though. The pull-ups and pull-downs seem to be controllable. If I remember correctly, DAT3 needs to have a controller-side pull-up for MMC cards. And the docs said the default was not to provide that (in order to use the internal pull-up that most, but not all, SD cards have for detection). Might be something to look at if you haven't already.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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