linux-kernel - Re: [PATCH] mmc: Always check for lower base frequency quirk for Ricoh 1180:e823

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Date:	Wed, 5 Oct 2011 12:43:06 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Manoj Iyer <manoj.iyer@...onical.com>
Cc:	Chris Ball <cjb@...top.org>,
	Koji Matsumuro <matsumur@....ricoh.co.jp>,
	Jesse Barnes <jbarnes@...tuousgeek.org>, stable@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: Always check for lower base frequency quirk for
 Ricoh 1180:e823

On Wed, Oct 05, 2011 at 11:27:01AM -0500, Manoj Iyer wrote:
> On Wed, 5 Oct 2011, Josh Boyer wrote:
> 
> >Commit 15bed0f2f added a quirk for the e823 Ricoh card reader to lower the
> >base frequency.  However, the quirk first checks to see if the proprietary
> >MMC controller is disabled, and returns if so.  On some devices, such as the
> >Lenovo X220, the MMC controller is already disabled by firmware it seems,
> 
> It is possible that the newer firmware from Lenovo disables the MMC
> controller. When the patch was done, these laptops had just been
> announced, so they had a very early version of the firmware (ver
> 1.02 iirc).

Seems so.  The X220 laptop I debugged this on shows:

[jwboyer@zod linux-2.6]$ cat /sys/devices/virtual/dmi/id/bios_version 
8DET42WW (1.12 )

josh
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