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

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Message-ID: <alpine.DEB.2.02.1110051313470.3478@sleepy>
Date:	Wed, 5 Oct 2011 13:19:08 -0500 (CDT)
From:	Manoj Iyer <manoj.iyer@...onical.com>
To:	Josh Boyer <jwboyer@...hat.com>
cc:	Manoj Iyer <manoj.iyer@...onical.com>, 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, 5 Oct 2011, Josh Boyer wrote:

> 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 )

I was able to track down the one I debugged, luckily the firmware on it was 
never updated, and great! the bios is even older than I thought...

u@u:~$ cat /sys/devices/virtual/dmi/id/bios_version
8DET25WW (0.25 )
u@u:~$

So, yes definitely looks like BIOS might have disabled MMC in the newer 
releases. /me wonders when IBVs will get their act together ...

>
> josh
>
>

--
====================
Manoj Iyer
Ubuntu/Canonical
Hardware Enablement
====================
--
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