linux-kernel - Re: [PATCH v5 7/7] Documentation:cpufreq:boost: Update BOOST documentation

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Message-id: <20130717101340.76b624e3@amdc308.digital.local>
Date:	Wed, 17 Jul 2013 10:13:40 +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 7/7] Documentation:cpufreq:boost: Update BOOST
 documentation

On Wed, 17 Jul 2013 13:29:26 +0530 Viresh Kumar viresh.kumar@...aro.org
wrote,
> On 17 July 2013 13:06, Lukasz Majewski <l.majewski@...sung.com> wrote:
> > At v4 there was the old acpi-cpufreq.c behaviour preserved (with
> > always exporting boost - when not supported ro, when supported rw).
> >
> > Due to Rafael and Dirk comments it has been rewritten at v5:
> >
> > http://thread.gmane.org/gmane.linux.kernel/1511831/match=patch+v4+2+7+cpufreq+add+boost+frequency+support+core
> >
> >
> >>
> >> Rafael Said:
> >> "Simple: Export it only when supported."
> >               [*]
> >
> >>
> >> AND
> >>
> >> "Don't change behavior of acpi-cpufreq driver"
> >               [**]
> >>
> >> If you see acpi-cpufreq driver carefully, it always creates "boost"
> >> sysfs entry. If its not supported then it creates a read only
> >> entry.
> >
> > For me those two statements [*] and [**] contradict:
> >
> > At v5:
> > 1. ARM - export "boost" only when supported (rw)
> > 2. x86 - export boost only when x86 supports it (as rw). When x86
> >          doesn't support HW boost - DO NOT export it at all.
> >
> > At v4:
> > 1. ARM - export "boost" only when supported (rw)
> > 2. x86 - always export boost - no matter if supported or not. If not
> >          supported, then export it as ro only.
> 
> Okay, there is some confusion..
> 
> I have raised a query on your v4 mail.. lets see what people have to
> say.

Ok.

-- 
Best regards,

Lukasz Majewski

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