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

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Date:	Mon, 21 Jun 2010 22:21:44 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	linux-mmc <linux-mmc@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.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 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

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