[PATCH v2 0/3] cpufreq:boost: CPU Boost mode support

From: Lukasz Majewski
Date: Tue Jun 11 2013 - 05:04:30 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 component:

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 and disabled by default
The cpufreq_driver is responsibile for providing low_level_boost callback

- struct cpufreq_driver has been extended with boost related fields

- Boost sysfs attributies are seen only when cpufreq driver supports them.
They will not show up until either cpufreq_driver defines low_level_boost
callback or device tree's cpufreq "boost_mode" attribute is defined.

- No special spin_lock for Boost was created. The one from cpufreq_driver
was reused.

- Low level boost trigger function (*low_level_boost function callback) is
necessary to "glue" together acpi-cpufreq boost with software based one.

Tested at: HW:
Exynos 4412 3.10 linux
Exynos 4210 3.10 linux
Compile tested x86_64 defconfig (acpi) - help with HW (Intel Nehalem) test

Two patches were abandoned (comparing to v1):
[PATCH 1/5] cpufreq: Define cpufreq_set_drv_attr_files() to add per CPU sysfs attributes
[PATCH 5/5] cpufreq:boost:Kconfig: Enable boost support at Kconfig

For detailed changelog please look into relevant patches

Lukasz Majewski (3):
cpufreq:boost: CPU frequency boost code unification for software and
hardware solutions
cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with common
boost solution
cpufreq:exynos:Extend Exynos cpufreq driver to support boost

drivers/cpufreq/acpi-cpufreq.c | 72 ++++++++++++++------------------------
drivers/cpufreq/cpufreq.c | 69 ++++++++++++++++++++++++++++++++++++
drivers/cpufreq/exynos-cpufreq.c | 49 ++++++++++++++++++++++++--
drivers/cpufreq/freq_table.c | 57 ++++++++++++++++++++++++++++--
include/linux/cpufreq.h | 12 +++++++
5 files changed, 209 insertions(+), 50 deletions(-)


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