linux-kernel - Re: [PATCH 2/2] mmc: fix mmc card disappearence on resume on ricoh mmc controllers

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Message-Id: <1275987466.30596.13.camel@dell16>
Date:	Tue, 08 Jun 2010 11:57:46 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Philip Langdale <philipl@...rt.org>
Cc:	linux-mmc@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mmc: fix mmc card disappearence on resume on ricoh
	mmc controllers

On Sun, 2010-06-06 at 19:22 -0400, Philip Langdale wrote:
> On Mon,  7 Jun 2010 00:28:51 +0300, Maxim Levitsky
> <maximlevitsky@...il.com> wrote:
> > The reason was that it takes time for controller to detect the card.
> > So wait a bit for the card to appear.
> > In worst case scenario, when you suspend the system with mmc card,
> > and actually remove it, the resume will be delayed maximum by 2 seconds
> 
> I suspect it's probably sending an SD id command to the card and then that
> has to time out on MMC cards.
> 
> Acked-by: Philip Langdale <philipl@...rt.org>

Thanks!

Note that I spoke too soon about it being perfect
While mmc card that stays in slot now works fine, a card that is
inserted while system is asleep, is detected, but then controller
becomes confused, so card doesn't work. A reinsert does help though.
Overall I need to work around some unusual delays imposed by controller
due to unusual card detection.
I'll sort that out eventually (and hope not to bring much ugliness to
sdhci{,-pci}.c

I think I update this patch to address both issues.

Best regards,
	Maxim Levitsky

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