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    SubjectRe: [PATCH v7 0/7] cpufreq:boost: CPU Boost mode support
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    On Monday, August 19, 2013 08:50:37 AM Lukasz Majewski wrote:
    > On Mon, 19 Aug 2013 12:08:26 +0530 Viresh Kumar viresh.kumar@linaro.org
    > wrote,
    > > On 13 August 2013 15:38, Lukasz Majewski <l.majewski@samsung.com>
    > > wrote:
    > > > This patch series introduces support for CPU overclocking technique
    > > > called Boost.
    > > >
    > > > It is a follow up of a LAB governor proposal. Boost is a LAB
    > > > component:
    > > > http://thread.gmane.org/gmane.linux.kernel/1484746/match=cpufreq
    > > >
    > > > Boost unifies hardware based solution (e.g. Intel Nehalem) with
    > > > software oriented one (like the one done at Exynos).
    > > > For this reason cpufreq/freq_table code has been reorganized to
    > > > include common code.
    > > >
    > > > Important design decisions:
    > > > - Boost related code is compiled-in unconditionally to cpufreq core
    > > > and disabled by default. The cpufreq_driver is responsibile for
    > > > setting boost_supported flag and providing set_boost callback(if HW
    > > > support is needed). For software managed boost, special Kconfig
    > > > flag - CONFIG_CPU_FREQ_BOOST_SW has been defined. It will be
    > > > selected only when a target platform has thermal framework properly
    > > > configured.
    > > >
    > > > - struct cpufreq_driver has been extended with boost related fields:
    > > > -- boost_supported - when driver supports boosting
    > > > -- boost_enabled - boost state
    > > > -- set_boost - callback to function, which is necessary to
    > > > enable/disable boost
    > > >
    > > > - Boost sysfs attribute (/sys/devices/system/cpu/cpufreq/boost) is
    > > > visible _only_ when cpufreq driver supports Boost.
    > > >
    > > > - No special spin_lock for Boost was created. The one from cpufreq
    > > > core was reused.
    > > >
    > > > - The Boost code doesn't rely on any policy. When boost state is
    > > > changed, then the policy list is iterated and proper adjustements
    > > > are done.
    > > >
    > > > - To improve safety level, the thermal framework is also extended
    > > > to disable software boosting, when thermal trip point is reached.
    > > > Then it starts monitoring target temperature to evaluate if boost
    > > > can be enabled again. This emulates behaviour similar to HW managed
    > > > boost (like x86)
    > > >
    > > > Tested at HW:
    > > > Exynos 4412 3.11-rc4 Linux
    > > > Intel Core i7-3770 3.11-rc4 Linux
    > > >
    > > > Above patches were posted on top of linux_pm/linux-next with
    > > > following patches applied:
    > > >
    > > > cpufreq: exynos5440: Fix to skip when new frequency same as current
    > > > cpufreq: fix EXYNOS drivers selection
    > > >
    > > > Lukasz Majewski (7):
    > > > cpufreq: Add boost frequency support in core
    > > > cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with
    > > > common boost solution
    > > > thermal:boost: Automatic enable/disable of BOOST feature
    > > > cpufreq:boost:Kconfig: Provide support for software managed BOOST
    > > > cpufreq:exynos:Extend Exynos cpufreq driver to support boost
    > > > framework
    > > > Documentation:cpufreq:boost: Update BOOST documentation
    > > > cpufreq:exynos4x12: Change L0 driver data to CPUFREQ_BOOST_FREQ
    > >
    > > Hi Lukasz,
    > >
    >
    > Hi Viresh,
    >
    > > I haven't found time yet to go through this series..
    >
    > I've just started wondering if I had send those patches correctly :-).
    >
    > > I want to do a
    > > deep/careful review this time as these are almost the final patches.
    >
    > Ok.
    >
    > >
    > > Will try to get over them by the end of this week..
    >
    > Ok, I understand.

    Do I assume correctly that this stuff has been tested on ACPI-compatible x86
    with acpi-cpufreq and everything has worked correctly there?

    Rafael



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