linux-kernel - Re: Bugs in MMC [was: [Bug 10030] Suspend doesn't work when SD card is inserted]

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Message-ID: <20080304070357.61ee825b@mjolnir.drzeus.cx>
Date:	Tue, 4 Mar 2008 07:03:57 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	David Brownell <david-b@...bell.net>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Bugs in MMC [was: [Bug 10030] Suspend doesn't work when SD card
 is inserted]

On Mon, 3 Mar 2008 13:59:37 -0800
David Brownell <david-b@...bell.net> wrote:

> 
> Card insert/remove events can be system wake events though.  Which
> makes that restriction impractical.
> 
> I think hosts need to be able to call mmc_detect_change() as soon as
> they see a stable signal.  The MMC core can hold off handling that
> for a while, if it needs to wait until the code walking the device
> tree gets around to resuming that host.  It's a lot more natural to
> hold off such stuff one time there than in N host drivers; especially
> since the MMC core already has such hold-off code.
> 

That actually sorts itself out as the MMC core reprobes on wakeup, but I see your point. Right now things will work peachy if the controllers just make sure to disable their card detection logic before telling the core to suspend.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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