linux-kernel - Re: i2c runtime suspend and system wide suspend

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Message-Id: <201012301149.30888.rjw@sisk.pl>
Date:	Thu, 30 Dec 2010 11:49:30 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Rabin Vincent <rabin@....in>
Cc:	Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Rajendra Nayak <rnayak@...com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Vishwanath BS <vishwanath.bs@...com>,
	Partha Basak <p-basak2@...com>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	linux-i2c@...r.kernel.org
Subject: Re: i2c runtime suspend and system wide suspend

On Thursday, December 30, 2010, Rabin Vincent wrote:
> On Thu, Dec 30, 2010 at 10:09 AM, Abhijeet Dharmapurikar
> <adharmap@...eaurora.org> wrote:
> > The i2c-core driver mixes runtime suspend and system wide suspend, in that,
> > during a system wide suspend, it skips calling ->suspend if the device is
> > runtime suspended.
> >
> > I have an interrupt controller running over the i2c bus and that driver is
> > oblivious of the runtime pm framework, IOW, it doesn't do any runtime pm
> > calls. CONFIG_RUNTIME_PM is enabled however (for some other bus drivers).
> > The issue I am facing is that all such i2c devices are assumed runtime
> > suspended and the ->suspend for these devices is not invoked during
> > systemwide suspend.
> 
> This was discussed on linux-pm recently.  Rafael had a fix, I'm don't know
> whether it's applied yet:
> 
> https://lists.linux-foundation.org/pipermail/linux-pm/2010-December/029567.html
> https://lists.linux-foundation.org/pipermail/linux-pm/2010-December/029596.html

Yes, the fix is already in the Linus' tree:

f08f5a0 PM / Runtime: Fix pm_runtime_suspended()
 
> Also relevant:
> 
> https://lists.linux-foundation.org/pipermail/linux-pm/2010-December/029600.html
> https://lists.linux-foundation.org/pipermail/linux-pm/2010-December/029658.html

I'm not sure what happened to the last patch.  Is there a new version?
If so, is it going to be pushed through the i2c tree, or should I take it?

Rafael
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