linux-kernel - Re: [PATCH] fix random SD/MMC card recognition failures on ARM Versatile

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Date:	Thu, 23 Nov 2006 16:03:35 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Vitaly Wool <vitalywool@...il.com>
Cc:	drzeus-mmc@...eus.cx, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix random SD/MMC card recognition failures on ARM Versatile

On Thu, Nov 23, 2006 at 06:46:06PM +0300, Vitaly Wool wrote:
> Hello Pierre,
> 
> currently sometimes the SD/MMC card inserted results in recognition failure on ARM Versatile board:
> 
>    <<<Plug in MMC card>>>
> 
> root@...satile:~# mmcblk0: mmc0:0001 SDMB-32 31360KiB
>  mmcblk0:<3>mmcblk0: error 3 transferring data
> end_request: I/O error, dev mmcblk0, sector 0
> Buffer I/O error on device mmcblk0, logical block 0
> mmcblk0: error 3 transferring data
> end_request: I/O error, dev mmcblk0, sector 0
> Buffer I/O error on device mmcblk0, logical block 0
>  unable to read partition table
> 
> This patch fixes the problem.

Doubtful.  mmci_stop_data() already does this, which will be called
immediately prior to mmci_request_end().  So you're doubling up the
writes to registers again.

Since this is not the first occurance that you've had to do this with
your board (the other being the SIC) I suggest that your board is
faulty in some way, causing writes to registers to be occasionally
dropped.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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