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Power management fix for 6.10-rc6

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Modify the intel_pstate driver to use HWP to initialize the ITMT
 scheduler extension if ACPI CPPC cannot be used for that, which is
 the case on some hybrid x86 systems (Rafael Wysocki).
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Merge tag 'pm-6.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "Modify the intel_pstate driver to use HWP to initialize the ITMT
  scheduler extension if ACPI CPPC cannot be used for that, which is the
  case on some hybrid x86 systems (Rafael Wysocki)"

* tag 'pm-6.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: intel_pstate: Use HWP to initialize ITMT if CPPC is missing
This commit is contained in:
Linus Torvalds 2024-06-27 12:35:30 -07:00
commit ef8abe9668
1 changed files with 6 additions and 7 deletions
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13
drivers/cpufreq/intel_pstate.c
View File

@ -355,15 +355,14 @@ static void intel_pstate_set_itmt_prio(int cpu)
int ret;
ret = cppc_get_perf_caps(cpu, &cppc_perf);
if (ret)
return;
/*
* On some systems with overclocking enabled, CPPC.highest_perf is hardcoded to 0xff.
* In this case we can't use CPPC.highest_perf to enable ITMT.
* In this case we can look at MSR_HWP_CAPABILITIES bits [8:0] to decide.
* If CPPC is not available, fall back to MSR_HWP_CAPABILITIES bits [8:0].
*
* Also, on some systems with overclocking enabled, CPPC.highest_perf is
* hardcoded to 0xff, so CPPC.highest_perf cannot be used to enable ITMT.
* Fall back to MSR_HWP_CAPABILITIES then too.
*/
if (cppc_perf.highest_perf == CPPC_MAX_PERF)
if (ret || cppc_perf.highest_perf == CPPC_MAX_PERF)
cppc_perf.highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached));
/*