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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2015-10-15 02:12:01 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-10-15 02:53:18 +0300 |
| commit | 37afb00032424d684a48d649fcfb8b5e4f17c409 (patch) | |
| tree | 27e39c9822569de2b6a18e5cc38c2074ce34d69e /drivers/cpufreq/Kconfig.x86 | |
| parent | 3bcc6fa971c06151d6bf90cb0dc80807f71b93f6 (diff) | |
| download | linux-37afb00032424d684a48d649fcfb8b5e4f17c409.tar.xz | |
cpufreq: intel_pstate: Use ACPI perf configuration
Use ACPI _PSS to limit the Intel P State turbo, max and min ratios.
This driver uses acpi processor perf lib calls to register performance.
The following logic is used to adjust Intel P state driver limits:
- If there is no turbo entry in _PSS, then disable Intel P state turbo
and limit to non turbo max
- If the non turbo max ratio is more than _PSS max non turbo value, then
set the max non turbo ratio to _PSS non turbo max
- If the min ratio is less than _PSS min then change the min ratio
matching _PSS min
- Scale the _PSS turbo frequency to max turbo frequency based on control
value.
This feature can be disabled by using kernel parameters:
intel_pstate=no_acpi
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/Kconfig.x86')
| -rw-r--r-- | drivers/cpufreq/Kconfig.x86 | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 index c59bdcb83217..adbd1de1cea5 100644 --- a/drivers/cpufreq/Kconfig.x86 +++ b/drivers/cpufreq/Kconfig.x86 @@ -5,6 +5,7 @@ config X86_INTEL_PSTATE bool "Intel P state control" depends on X86 + select ACPI_PROCESSOR if ACPI help This driver provides a P state for Intel core processors. The driver implements an internal governor and will become |