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From: Kevin Hilman <khilman@kernel.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
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        Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
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Subject: Re: [PATCH] PM / domains: Kconfig: always enable PM_RUNTIME when genpd enabled
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Date: Mon, 17 Nov 2014 10:25:58 -0800
In-Reply-To: <6465990.KKns6W8hQE@vostro.rjw.lan> (Rafael J. Wysocki's message
	of "Mon, 17 Nov 2014 02:22:52 +0100")
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"Rafael J. Wysocki" <rjw@rjwysocki.net> writes:

> 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@kernel.org> wrote:
>> >> On Thu, Nov 13, 2014 at 11:28 PM, Kevin Hilman <khilman@kernel.org> 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.

Yes.  

If that were the case, we woudn't need the pm_runtime_force_* calls
either.

Kevin