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

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Message-ID: <acd2a5930611231129v3515022al931bec5b04ce27f@mail.gmail.com>
Date:	Thu, 23 Nov 2006 22:29:30 +0300
From:	"Vitaly Wool" <vitalywool@...il.com>
To:	"Vitaly Wool" <vitalywool@...il.com>, drzeus-mmc@...eus.cx,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix random SD/MMC card recognition failures on ARM Versatile

On 11/23/06, Russell King <rmk+lkml@....linux.org.uk> wrote:
> 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.

There's the case (mmci_cmd_irq) where mmc_stop_data is not called
prior to mmci_request_end(), so it's not that simple.

> 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.

I can't 100% guarantee that it's not the case, but the problem has
been reproduced by at least 2 people on 2 different boards and on 2
different sides of the Atlantic. So I'd suspect there's either a SW
problem or a HW revision problem, at least.

Vitaly
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