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

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Date:	Thu, 27 Jun 2013 17:55:46 +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 Wed, 26 Jun 2013 16:24:32 +0530, Viresh Kumar wrote:

> > +int cpufreq_boost_trigger_state(int state)
> > +{
> > +       unsigned long flags;
> > +       int ret = 0;
> > +
> > +       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().

> > +
> > +               if (ret) {
> > +                       boost_enabled = 0;
> > +
> > write_unlock_irqrestore(&cpufreq_driver_lock, flags);
> > +                       pr_err("%s: BOOST cannot enable (%d)\n",
> > +                              __func__, ret);
> > +
> > +                       return ret;
> > +               }
> > +               write_unlock_irqrestore(&cpufreq_driver_lock,
> > flags);  


-- 
Best regards,

Lukasz Majewski

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