linux-kernel - Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core

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Date:	Fri, 28 Jun 2013 08:49:39 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocky" <rjw@...k.pl>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Andre Przywara <andre.przywara@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core

On Fri, 28 Jun 2013 09:10:53 +0530, Viresh Kumar wrote:
> On 27 June 2013 21:25, Lukasz Majewski <l.majewski@...sung.com> wrote:
> > On Wed, 26 Jun 2013 16:24:32 +0530, Viresh Kumar wrote:
> >> > +       if (boost_enabled != state) {
> >> > +               write_lock_irqsave(&cpufreq_driver_lock, flags);
> >> > +               boost_enabled = state;
> >> > +               if (cpufreq_driver->enable_boost)
> >> > +                       ret =
> >> > cpufreq_driver->enable_boost(state);
> >> > +               else
> >> > +                       ret = cpufreq_boost_trigger_state_sw();
> >
> > I will use only one call to cpufreq_driver->enable_boost(state) [*]
> > with either cpufreq_boost_enable_sw() (function with SW boost
> > handling) or the one provided by cpufreq driver.
> >
> > Only when cpufreq driver doesn't provide [*], it will be filled with
> > "default" cpufreq_boost_enable_sw().
> 
> I didn't get it completely. You are saying you will send a function
> pointer now?

No, I will use:

if (boost_enabled != state) {
	write_lock_irqsave(&cpufreq_driver_lock, flags);
	boost_enabled = state;

	ret = cpufreq_driver->enable_boost(state);
	^^^^^^^^^^^^^^^^^^^^ only one callback call
	if (ret)
		boost_enabled = 0;

	write_unlock_irqrestore(&cpufreq_driver_lock, flags);

	if (ret)
		pr_err("%s: BOOST cannot enable (%d)\n",
		       __func__, ret);
}

and @ cpufreq_register_driver() I will add following line:

if (!cpufreq_driver->enable_boost)
	cpufreq_driver->enable_boost = &cpufreq_boost_enable_sw;

When cpufreq driver doesn't define callback for enable_boost it will be
filled with default SW cpufreq_boost_enable_sw callback.



-- 
Best regards,

Lukasz Majewski

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