Re: [PATCH v12 0/7] cpufreq:boost: CPU Boost mode support
From: Lukasz Majewski
Date: Tue Jan 07 2014 - 01:59:01 EST
> 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
> 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
> - To improve safety level, the thermal framework is also extended to
> disable software boosting, when thermal trip point is reached. After
> cooling down the boost can be enabled again. This emulates behaviour
> similar to HW managed boost (like x86)
> Tested at HW:
> Exynos 4412 3.13-rc4 Linux
> Intel Core i7-3770 3.13-rc4 Linux
> Above patches were posted on top of kernel_pm/bleeding-edge
> (SHA1: bd0f3a5d9dce48a917ce1f1047534d79c725149)
> 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
> cpufreq:boost:Kconfig: Provide support for software managed BOOST
> cpufreq:exynos:Extend Exynos cpufreq driver to support boost
> Documentation:cpufreq:boost: Update BOOST documentation
> cpufreq:exynos4x12: Change L0 driver data to CPUFREQ_BOOST_FREQ
> thermal:exynos:boost: Automatic enable/disable of BOOST feature (at
> Documentation/cpu-freq/boost.txt | 26 +++----
> drivers/cpufreq/Kconfig | 4 +
> drivers/cpufreq/Kconfig.arm | 15 ++++
> drivers/cpufreq/acpi-cpufreq.c | 86
> +++++++-------------- drivers/cpufreq/cpufreq.c |
> 118 ++++++++++++++++++++++++++++-
> drivers/cpufreq/exynos-cpufreq.c | 3 +
> drivers/cpufreq/exynos4x12-cpufreq.c | 2 +-
> drivers/cpufreq/freq_table.c | 56 ++++++++++++--
> drivers/thermal/samsung/exynos_tmu_data.c | 12 +--
> include/linux/cpufreq.h | 24 ++++++ 10 files
> changed, 261 insertions(+), 85 deletions(-)
A gentle ping about BOOST patches.
Its been already acked by Viresh and Eduardo.
It applies on kernel_pm/bleeding_edge SHA1:
Thanks in advance.
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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