Re: [PATCH] PM / domains: Kconfig: always enable PM_RUNTIME when genpd enabled

From: Rafael J. Wysocki
Date: Sun Nov 16 2014 - 20:01:58 EST

On Saturday, November 15, 2014 01:32:01 PM Geert Uytterhoeven wrote:
> Hi Kevin,
> On Fri, Nov 14, 2014 at 6:36 PM, Kevin Hilman <khilman@xxxxxxxxxx> wrote:
> >> On Thu, Nov 13, 2014 at 11:28 PM, Kevin Hilman <khilman@xxxxxxxxxx> wrote:
> >>> It makes little sense to use generic power domains without runtime PM.
> >>
> >> Does it?
> >> It still powers down the PM domains on system suspend (at least on my
> >> boards ;-)
> >
> > Sure, but your devices are also using runtime PM, so I'm not sure how
> > does that change my statement above?
> I do mean with CONFIG_PM_RUNTIME turned off.
> If PM domain support is disabled, s2ram will not power down the PM domains.

But if PM_RUNTIME is enabled along with it, I don't think it will make much
of a different, will it?

Building the kernel with genpd and without PM_RUNTIME is possible today,
but is it really useful? To me, it only seems to make people try to
reinvent the wheel "because PM_RUNTIME may be unset".

I have to say I'm seriously considering to make PM_SLEEP select
PM_RUNTIME too as that would make quite a few things a *lot* simpler.

I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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