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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2015-10-14 23:12:01 (GMT)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-10-14 23:53:18 (GMT)
commit37afb00032424d684a48d649fcfb8b5e4f17c409 (patch)
tree27e39c9822569de2b6a18e5cc38c2074ce34d69e /Documentation/kernel-parameters.txt
parent3bcc6fa971c06151d6bf90cb0dc80807f71b93f6 (diff)
downloadlinux-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>
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