linux-kernel - Re: 2.6.20 mmc: problem with highspeed SD card

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Date:	Thu, 15 Feb 2007 06:48:12 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Eugene Ilkov <e.ilkov@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.20 mmc: problem with highspeed SD card

Eugene Ilkov wrote:
> I have I/O errors with Transcend SD highspeed card 2GB/150x when it's
> mounted in r/w mode (cardreader on sharp sl-c1000)
> It works well  if I reverse mmcv4 patch commited to 2.6.19-git2
> (http://lkml.org/lkml/2006/10/4/27)

That patch is not the same as you are referencing in the rest of your mail.

> I'm not experienced in mmc, but I figured out that problem is
> somewhere in mmc_read_switch_caps() and when i change cmd.arg value
> from 0x80FFFFF1 to 0x00FFFFF1 it works fine too
> What argument should have SD_SWITCH opcode?
> 

The argument is correct, so I'm guessing that your controller might be a bit
flaky and not handle the new timing. Can you enable MMC_DEBUG and send over the
dmesg?

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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