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| author | Chen Yu <yu.c.chen@intel.com> | 2021-01-12 13:21:27 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-01-12 19:44:49 +0100 |
| commit | 6f67e060083a84a4cc364eab6ae40c717165fb0c (patch) | |
| tree | 031978b05159489fd6609d7d1ab6673b593b6289 /drivers/most | |
| parent | 597ffbc8d085870e071807b514a6ed45809f81a5 (diff) | |
cpufreq: intel_pstate: Get per-CPU max freq via MSR_HWP_CAPABILITIES if available
Currently, when turbo is disabled (either by BIOS or by the user),
the intel_pstate driver reads the max non-turbo frequency from the
package-wide MSR_PLATFORM_INFO(0xce) register.
However, on asymmetric platforms it is possible in theory that small
and big core with HWP enabled might have different max non-turbo CPU
frequency, because MSR_HWP_CAPABILITIES is per-CPU scope according
to Intel Software Developer Manual.
The turbo max freq is already per-CPU in current code, so make
similar change to the max non-turbo frequency as well.
Reported-by: Wendy Wang <wendy.wang@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
[ rjw: Subject and changelog edits ]
Cc: 4.18+ <stable@vger.kernel.org> # 4.18+: a45ee4d4e13b: cpufreq: intel_pstate: Change intel_pstate_get_hwp_max() argument
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/most')
0 files changed, 0 insertions, 0 deletions