linux-kernel - Re: [PATCH] Two fixes for my mmc/sd cardreader

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Message-Id: <20100621123921.045e245f.akpm@linux-foundation.org>
Date:	Mon, 21 Jun 2010 12:39:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	linux-mmc <linux-mmc@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Philip Langdale <philipl@...rt.org>
Subject: Re: [PATCH] Two fixes for my mmc/sd cardreader

On Mon, 21 Jun 2010 22:21:44 +0300
Maxim Levitsky <maximlevitsky@...il.com> wrote:

> On Fri, 2010-06-18 at 00:21 +0300, Maxim Levitsky wrote: 
> > Hi,
> > 
> > These are 2 fixes for my card reader.
> > 
> > 
> > First patch fixes old issue with system hand on suspend to disk/ram with
> > mmc card inserted.
> > I updated description, and pm notification registration order.
> > I think this patch can an should go to 2.6.35, because it fixes long
> > standing and nasty regression.
> > 
> > The second patch is a result of my work trying to understand why my card
> > reader sometimes dies on resume.
> > This reader has a special MMC function which steals MMC cards, and until
> > now had no driver. A way to disable it was found, and while it works, it
> > has (at least here) a side effect of killing the controller on resume
> > from ram/disk (and it happens often, and doesn't depend of whether card
> > was in slot or not during suspend).
> > 
> > Fortunately it turned out that MMC part is _almost_ standard SDHCI
> > controller.
> > This patch adds support for this device to standard sdhci driver.
> > Unfortunately, this support still contais small hack.
> > It waits 1/2 of a second on resume before initializing the controller.
> > Not doing so, and resuming with MMC card present results in confused
> > controller. It is not dead though. A card reinsert makes it work again
> > with all cards.
> > Yet the 1st patch is must for this because otherwise mmc core seeing
> > that controller doesn't respond, removes the card, therefore hangs the
> > system.
> > It doesn't happen when I wait these 1/2 of second though.
> > 
> > I think that this patch is also ok for 2.6.35, because it only adds new
> > functionality.
> > You are free to disable MMC controller using the same
> > CONFIG_MMC_RICOH_MMC.
> > 
> > If you don't disable it though, instead of full lack of functionality
> > you will get full featured MMC controller.
> > 
> > Best regards,
> > Maxim Levitsky
> > 
> > 
> > 
> ping

hey, that was only three days.  I commonly leave things to bake on the
mailing list for a while, see what people have to say about it. 
Particularly with subsystems like MMC.
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