diff options
| author | Zhang Rui <rui.zhang@intel.com> | 2021-04-12 14:59:01 +0200 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2021-04-20 09:18:57 +0200 |
| commit | 2eb87d75f980bcc7c2bd370661f8fcc4ec273ea5 (patch) | |
| tree | 879383818d01d96dd8c42a7929663de170127594 /drivers/thermal/intel/Kconfig | |
| parent | thermal/drivers/bcm2835: Remove redundant dev_err call in bcm2835_thermal_pro... (diff) | |
| download | linux-2eb87d75f980bcc7c2bd370661f8fcc4ec273ea5.tar.xz linux-2eb87d75f980bcc7c2bd370661f8fcc4ec273ea5.zip | |
thermal/drivers/intel: Introduce tcc cooling driver
On Intel processors, the core frequency can be reduced below OS request,
when the current temperature reaches the TCC (Thermal Control Circuit)
activation temperature.
The default TCC activation temperature is specified by
MSR_IA32_TEMPERATURE_TARGET. However, it can be adjusted by specifying an
offset in degrees C, using the TCC Offset bits in the same MSR register.
This patch introduces a cooling devices driver that utilizes the TCC
Offset feature. The bigger the current cooling state is, the lower the
effective TCC activation temperature is, so that the processors can be
throttled earlier before system critical overheats.
Note that, on different platforms, the behavior might be different on
how fast the setting takes effect, and how much the CPU frequency is
reduced.
This patch has been tested on a KabyLake mobile platform from me, and also
on a CometLake platform from Doug.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested by: Doug Smythies <dsmythies@telus.net>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210412125901.12549-1-rui.zhang@intel.com
Diffstat (limited to 'drivers/thermal/intel/Kconfig')
| -rw-r--r-- | drivers/thermal/intel/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index ce4f59213c7a..e4299ca3423c 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -79,3 +79,14 @@ config INTEL_PCH_THERMAL Enable this to support thermal reporting on certain intel PCHs. Thermal reporting device will provide temperature reading, programmable trip points and other information. + +config INTEL_TCC_COOLING + tristate "Intel TCC offset cooling Driver" + depends on X86 + help + Enable this to support system cooling by adjusting the effective TCC + activation temperature via the TCC Offset register, which is widely + supported on modern Intel platforms. + Note that, on different platforms, the behavior might be different + on how fast the setting takes effect, and how much the CPU frequency + is reduced. |