linux-kernel - Re: [PATCH] i2c: Fix bus-level power management callbacks

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Date:	Thu, 25 Mar 2010 21:16:23 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	linux-pm@...ts.linux-foundation.org,
	Linux I2C <linux-i2c@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: Fix bus-level power management callbacks

On Thursday 25 March 2010, Mark Brown wrote:
> On Thu, Mar 25, 2010 at 09:57:20AM +0100, Jean Delvare wrote:
> 
> > Mark, you contributed the initial runtime PM support for the i2c
> > subsystem, I thought you would have comments on Rafael's
> > reimplementation?
> 
> Yeah, see below...
> 
> > >  drivers/i2c/i2c-core.c     |  168 ++++++++++++++++++++++++++-------------------
> > >  include/linux/pm_runtime.h |    7 +
> 
> > I am a little surprised to see changes to a generic header file here,
> > how is the i2c subsystem so special that we have needs other subsystems
> > did not?
> 
> Very few subsystems actually support runtime PM thus far - I think it's
> more the case that I2C is an early user than anything else.

That's the case indeed.

> > Apart from the above, the code looks sane to me, but then again I don't
> > know a thing about power management. I'll keep this patch in my i2c
> > tree, scheduled for merge in 2.6.35. If there are any updates, please
> > send them over, either as a new patch or as incremental changes which I
> > will merge myself.
> 
> I'm in a similar position - the code looks fine except I'm not 100% sure
> I follow all the possible ifdefs and I've never actually used hibernate
> (s2disk isn't supported on ARM) but for what it's worth:
> 
> Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>

Thanks!

Rafael
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