linux-kernel - Re: [PATCH V2 0/3] PM: Enable option of re-use runtime PM callbacks at system suspend

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Date:	Fri, 20 Dec 2013 14:18:22 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [PATCH V2 0/3] PM: Enable option of re-use runtime PM callbacks at system suspend

On Friday, December 20, 2013 09:43:16 AM Ulf Hansson wrote:
> On 10 December 2013 14:37, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> > To put devices into low power state during system suspend, it is convenient
> > for some runtime PM supported power domains, subsystems and drivers to have
> > the option of re-using and invoking the runtime PM callbacks from their system
> > PM callbacks.
> >
> > The benefit is that we don't need to implement wrapper functions which
> > handles runtime PM resourses, typically called from both runtime PM and system
> > PM callbacks.
> >
> > Some new helper macros for defining the PM callbacks are added.
> >
> > SET_PM_RUNTIME_PM_OPS; to define runtime PM callbacks for CONFIG_PM instead of
> > CONFIG_PM_RUNTIME.
> >
> > SET_LATE_SYSTEM_SLEEP_PM_OPS; to define common late/early system PM callbacks,
> > same approach is applicable to the existing SET_SYSTEM_SLEEP_PM_OPS which
> > defines common suspend/resume system PM callbacks.
> >
> > A minor fix was needed for the platform bus, which runtime PM callbacks are set
> > to the pm_generic_runtime_suspend|resume functions. These were implemented only
> > for CONFIG_PM_RUNTIME and thus the platform bus prevented driver's runtime PM
> > callbacks to be invoked when only CONFIG_PM_SLEEP was used. We move them into
> > CONFIG_PM to resolve the problem.
> >
> > Changes in v2:
> >         Updated commit messages to try to better reflect the changes.
> >         Removed the below patches from this patch set. Let's leave those to be
> >         addressed separately, if needed.
> >         - PM / Sleep: Add pm_generic functions to re-use runtime PM callbacks
> >         - drm/exynos: Convert to suspend_late/resume_early callbacks for fimc
> >
> >
> > Ulf Hansson (3):
> >   PM / Runtime: Add second macro for definition of runtime PM callbacks
> >   PM / Runtime: Implement the pm_generic_runtime functions for
> >     CONFIG_PM
> >   PM / Sleep: Add macro to define common late/early system PM callbacks
> >
> >  drivers/base/power/generic_ops.c |    4 ++--
> >  include/linux/pm.h               |   21 +++++++++++++++++++++
> >  include/linux/pm_runtime.h       |   12 ++++++++----
> >  3 files changed, 31 insertions(+), 6 deletions(-)
> >
> > --
> > 1.7.9.5
> >
> 
> Hi,
> 
> Just wanted to send a kind ping on this patchset.
> 
> Would be nice to try to conclude on the way forward after the quite
> long and good discussions we had around this topic.

Sorry, I was traveling last week.  I'm processing my backlog now, hopefully
I'll get to your patches shortly.

Thanks,
Rafael

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