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

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Date:	Fri, 28 Jun 2013 12:21:21 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lukasz Majewski <l.majewski@...sung.com>
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 28 June 2013 12:19, Lukasz Majewski <l.majewski@...sung.com> wrote:
> 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.

That's some smart  code. Good. :)
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