• Lukasz Majewski's avatar
    cpufreq: Add boost frequency support in core · 6f19efc0
    Lukasz Majewski authored
    This commit adds boost frequency support in cpufreq core (Hardware &
    Software). Some SoCs (like Exynos4 - e.g. 4x12) allow setting frequency
    above its normal operation limits. Such mode shall be only used for a
    short time.
    Overclocking (boost) support is essentially provided by platform
    dependent cpufreq driver.
    This commit unifies support for SW and HW (Intel) overclocking solutions
    in the core cpufreq driver. Previously the "boost" sysfs attribute was
    defined in the ACPI processor driver code. By default boost is disabled.
    One global attribute is available at: /sys/devices/system/cpu/cpufreq/boost.
    It only shows up when cpufreq driver supports overclocking.
    Under the hood frequencies dedicated for boosting are marked with a
    special flag (CPUFREQ_BOOST_FREQ) at driver's frequency table.
    It is the user's concern to enable/disable overclocking with a proper call
    to sysfs.
    The cpufreq_boost_trigger_state() function is defined non static on purpose.
    It is used later with thermal subsystem to provide automatic enable/disable
    of the BOOST feature.
    Signed-off-by: default avatarLukasz Majewski <l.majewski@samsung.com>
    Signed-off-by: default avatarMyungjoo Ham <myungjoo.ham@samsung.com>
    Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
freq_table.c 8.75 KB