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

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Message-ID: <AANLkTinqqgNwgFCMVL-2T83zKnNLGLF007atJ4-EDEW5@mail.gmail.com>
Date:	Thu, 30 Dec 2010 12:02:53 +0530
From:	Rabin Vincent <rabin@....in>
To:	Abhijeet Dharmapurikar <adharmap@...eaurora.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 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

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
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