[PATCH v12 3/7] cpufreq:boost:Kconfig: Provide support for software managed BOOST

Lukasz Majewski
2013-12-20T14:25:33Z

For safety reasons new flag - CONFIG_CPU_FREQ_BOOST_SW has been added.
Only after selecting "EXYNOS Frequency Overclocking - Software" Kconfig
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 in
hardware.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

---
Changes for v12:
- None

Changes for v11:
- None

Changes for v10:
- None

Changes for v9:
- None

Changes for v8:
- None

Changes for v7:
- Remove superfluous "default n" definition
- Generic CPU_FREQ_BOOST_SW depends on THERMAL

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 | 4 ++++
drivers/cpufreq/Kconfig.arm | 15 +++++++++++++++
2 files changed, 19 insertions(+)

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 38093e2..c8818c1 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -20,6 +20,10 @@ if CPU_FREQ
config CPU_FREQ_GOV_COMMON
bool

+config CPU_FREQ_BOOST_SW
+ bool
+ depends on THERMAL
+
config CPU_FREQ_STAT
tristate "CPU frequency translation statistics"
default y
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index ce52ed9..25599d6 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -64,6 +64,21 @@ config ARM_EXYNOS5440_CPUFREQ

If in doubt, say N.

+config ARM_EXYNOS_CPU_FREQ_BOOST_SW
+ bool "EXYNOS Frequency Overclocking - Software"
+ depends on ARM_EXYNOS_CPUFREQ
+ select CPU_FREQ_BOOST_SW
+ select EXYNOS_THERMAL
+ help
+ This driver supports software managed overclocking (BOOST).
+ It allows usage of special frequencies for Samsung Exynos
+ processors if thermal conditions are appropriate.
+
+ It reguires, for safe operation, thermal framework with properly
+ defined trip points.
+
+ If in doubt, say N.
+
config ARM_HIGHBANK_CPUFREQ
tristate "Calxeda Highbank-based"
depends on ARCH_HIGHBANK
--
1.7.10.4