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| author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2019-12-19 23:53:16 +0100 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2020-01-27 10:24:32 +0100 |
| commit | a4c428e523490bf53e9c4ba2d809130c58c06ac7 (patch) | |
| tree | ad6044a20c4f6ee88470acbd3a79d981cb221d33 /drivers/thermal/Kconfig | |
| parent | 0a1990a2d1f2217db20b30f915f48d9b8b976949 (diff) | |
| download | lwn-a4c428e523490bf53e9c4ba2d809130c58c06ac7.tar.gz lwn-a4c428e523490bf53e9c4ba2d809130c58c06ac7.zip | |
thermal/drivers/cpu_cooling: Introduce the cpu idle cooling driver
The cpu idle cooling device offers a new method to cool down a CPU by
injecting idle cycles at runtime.
It has some similarities with the intel power clamp driver but it is
actually designed to be more generic and relying on the idle injection
powercap framework.
The idle injection duration is fixed while the running duration is
variable. That allows to have control on the device reactivity for the
user experience.
An idle state powering down the CPU or the cluster will allow to drop
the static leakage, thus restoring the heat capacity of the SoC. It
can be set with a trip point between the hot and the critical points,
giving the opportunity to prevent a hard reset of the system when the
cpufreq cooling fails to cool down the CPU.
With more sophisticated boards having a per core sensor, the idle
cooling device allows to cool down a single core without throttling
the compute capacity of several cpus belonging to the same clock line,
so it could be used in collaboration with the cpufreq cooling device.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20191219225317.17158-2-daniel.lezcano@linaro.org
Diffstat (limited to 'drivers/thermal/Kconfig')
| -rw-r--r-- | drivers/thermal/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 62c1c83f5d31..dc36941aef6e 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -170,6 +170,13 @@ config CPU_FREQ_THERMAL This will be useful for platforms using the generic thermal interface and not the ACPI interface. +config CPU_IDLE_THERMAL + bool "CPU idle cooling device" + depends on IDLE_INJECT + help + This implements the CPU cooling mechanism through + idle injection. This will throttle the CPU by injecting + idle cycle. endif config CLOCK_THERMAL |