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| author | Perry Yuan <[email protected]> | 2022-08-30 01:56:00 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <[email protected]> | 2022-09-03 18:17:32 +0000 |
| commit | bedadcfb011fef55273bd686e8893fdd8911dcdb (patch) | |
| tree | c1d178250aaa95bb15ec7297d6e7b68b7858155c /scripts/clang-tools/run-clang-tools.py | |
| parent | cpufreq: amd-pstate: update pstate frequency transition delay time (diff) | |
| download | kernel-bedadcfb011fef55273bd686e8893fdd8911dcdb.tar.gz kernel-bedadcfb011fef55273bd686e8893fdd8911dcdb.zip | |
cpufreq: amd-pstate: Fix initial highest_perf value
To avoid some new AMD processors use wrong highest perf when amd pstate
driver loaded, this fix will query the highest perf from MSR register
MSR_AMD_CPPC_CAP1 and cppc_acpi interface firstly, then compare with the
highest perf value got by calling amd_get_highest_perf() function.
The lower value will be the correct highest perf we need to use.
Otherwise the CPU max MHz will be incorrect if the
amd_get_highest_perf() did not cover the new process family and model ID.
Like this lscpu info, the max frequency is incorrect.
Vendor ID: AuthenticAMD
Socket(s): 1
Stepping: 2
CPU max MHz: 5410.0000
CPU min MHz: 400.0000
BogoMIPS: 5600.54
Fixes: 3743d55b289c2 (x86, sched: Fix the AMD CPPC maximum performance value on certain AMD Ryzen generations)
Acked-by: Huang Rui <[email protected]>
Signed-off-by: Perry Yuan <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Diffstat (limited to 'scripts/clang-tools/run-clang-tools.py')
0 files changed, 0 insertions, 0 deletions