linux-kernel - Re: [PATCH v6 5/8] cpufreq:boost:Kconfig: Provide support for software managed BOOST

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Date:	Fri, 26 Jul 2013 15:54:56 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Lukasz Majewski <l.majewski@...sung.com>
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>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>, durgadoss.r@...el.com
Subject: Re: [PATCH v6 5/8] cpufreq:boost:Kconfig: Provide support for
 software managed BOOST

On 25 July 2013 22:03, Lukasz Majewski <l.majewski@...sung.com> wrote:
> For safety reasons new flag - CONFIG_CPU_FREQ_BOOST_SW has been added.
> Only after selecting "EXYNOS Frequency Overclocking - Software" Kconfig

You shouldn't mention Exynos here and must do exynos stuff at the end
in a separate patch. This one must be generic.

> option the software managed boost is enabled. It also selects thermal
> subsystem to be compiled in. Thermal is necessary for disabling boost
> and cooling down the device when overheating detected.
>
> Boost _MUST_NOT_ work without thermal subsystem with properly defined
> overheating temperatures.
>
> This option doesn't affect x86's ACPI hardware managed boost support
> (i.e. Intel, AMD). In this situation boost management is embedded at
> hardware.
>
> Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
>
> ---
> Changes for v6:
> - CPU_FREQ_BOOST_SW [1] is now defined as "invisible" bool option.
> - Platform dependent ARM_EXYNOS_CPU_FREQ_BOOST_SW config option has been
>   added. It depends on ARM_EXYNOS_CPUFREQ options and selects
>   EXYNOS_THERMAL with the main boost config [1].
>
> Changes for v5:
> - New patch
>
>  drivers/cpufreq/Kconfig     |    3 +++
>  drivers/cpufreq/Kconfig.arm |   16 ++++++++++++++++
>  2 files changed, 19 insertions(+)
>
> diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
> index 534fcb8..3f058a3 100644
> --- a/drivers/cpufreq/Kconfig
> +++ b/drivers/cpufreq/Kconfig
> @@ -23,6 +23,9 @@ config CPU_FREQ_TABLE
>  config CPU_FREQ_GOV_COMMON
>         bool
>
> +config CPU_FREQ_BOOST_SW
> +       bool

Invisible is fine but this must be disabled by default and must
depend on thermal, rather than moving dependency on platform's
config.
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