linux-kernel - Re: [PATCH v5 6/7] cpufreq:boost:Kconfig: Enable software managed BOOST support at Kconfig

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Message-id: <20130717101251.164fbad8@amdc308.digital.local>
Date:	Wed, 17 Jul 2013 10:12:51 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>, l.majewski@...ess.pl,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andre Przywara <andre.przywara@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>
Subject: Re: [PATCH v5 6/7] cpufreq:boost:Kconfig: Enable software managed
 BOOST support at Kconfig

On Wed, 17 Jul 2013 13:22:20 +0530 Viresh Kumar viresh.kumar@...aro.org
wrote,
> On 17 July 2013 12:47, Lukasz Majewski <l.majewski@...sung.com> wrote:
> > On Wed, 17 Jul 2013 10:54:55 +0530 Viresh Kumar
> > viresh.kumar@...aro.org wrote,
> >> On 16 July 2013 17:20, Lukasz Majewski <l.majewski@...sung.com>
> >> wrote:
> >> > On Tue, 16 Jul 2013 15:28:40 +0530 Viresh Kumar
> >> > viresh.kumar@...aro.org wrote,
> >> >> On 4 July 2013 14:20, Lukasz Majewski <l.majewski@...sung.com>
> >> >> wrote:
> >> >> > diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> >> >>
> >> >> > +config CPU_FREQ_BOOST_SW
> >> >> > +       bool "CPU frequency overclocking (BOOST)"
> >> >>
> >> >> Name it "CPU Frequency Overclocking - Software"
> >> >
> >> > Thanks, I had a puzzle to came up with a good short name :-).
> >> >
> >> >>
> >> >> > +       depends on ARM_EXYNOS_CPUFREQ && EXYNOS_THERMAL
> >> >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [*]
> >> >>
> >> >> Remote Exynos from here. If you want to enable it for your
> >> >> platform by default, then select it from EXYNOS.
> >
> > I can change ARM_EXYNOS_CPUFREQ -> CPUFREQ at [*]
> 
> We are in cpufreq Kconfig and so dependency is automatically
> there on cpufreq.

So then, it can be removed.

> 
> >>
> >> I misread it a bit. I wanted to say make it dependent only on
> >> THERMAL and not on Exynos.
> >
> > The cpufreq boost feature is possible to be enabled only when those
> > [*] dependencies are met. Moreover, it is disabled by default.
> >
> > This means that not only THERMAL generic code must be supported, but
> > also EXYNOS specific one - like per SoC trip points [**].
> >
> > With thermal it is possible (and correct) to only define THERMAL,
> > with no platform (in this case Exynos) specific definitions. To
> > force potential user to define [**], I think, that EXYNOS_THERMAL
> > is required.
> >
> >>
> >> > The purpose of the condition [*] here is to prevent from enabling
> >> > boost when thermal for Exynos is not supported.
> >>
> >> Why? Can't others use it? Its not exynos specific :)
> >
> > No it is not exynos specific.
> > For other platform one need to define:
> >
> > depends on CPUFREQ && (EXYNOS_THERMAL ||
> > <PLATFORM_SUPPORTED>_THERMAL)
> 
> Exactly. I don't want this kind of mess to be present here.
> 
> People selecting this feature must know what it does and
> dependency on a coolant is enough.
> 
> For other drivers, selecting this doesn't matter as they don't
> support boost.

Then it should be enough to only write:

depends on THERMAL

(since CPUFREQ is already enabled for entering this menu).




-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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