linux-kernel - Re: 900af0d breaks some embedded suspend/resume

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Message-ID: <20090426092550.GB1354@ucw.cz>
Date:	Sun, 26 Apr 2009 11:25:51 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Len Brown <lenb@...nel.org>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: 900af0d breaks some embedded suspend/resume

On Sun 2009-04-19 00:44:57, Rafael J. Wysocki wrote:
> On Saturday 18 April 2009, Linus Torvalds wrote:
> > 
> > On Sat, 18 Apr 2009, Russell King wrote:
> > > 
> > > What I need to be able to do is to suspend most devices on the host side
> > > which may involve talking to a separate microcontroller via I2C to shut
> > > down power to peripherals.
> > 
> > I suspect that for cases like this, the simplest thing to do is to just 
> > add a marker for "don't mess with my power management, I'm doing 
> > everything through sysdev" for the specified devices.
> 
> In this particular case, if sysdev was used, there would be no problem, but the
> platform uses a platform device to suspend-resume the i2c controller.
> In principle we could convert it to use a sysdev, but that would be more
> difficult than the last patch I sent IMO (at least to me).
> 
> Also, apparently it is not the only platform doing it.

OTOH... if the device is needed in late phases of sleep, sysdev *does*
sound like a way to go. So it would be nice to convert those devices
to sysdevs one day.....
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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