cpufreq: intel_pstate: Fix setting minimum P-state at init time

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If HWP is enabled, writes to MSR_IA32_PERF_CTL have no effect,
so intel_pstate_get_cpu_pstates() should not attempt to call
intel_pstate_set_min_pstate() to set the minimum P-state for the
given CPU in that case.

Accordingly, remove the intel_pstate_set_min_pstate()
call from intel_pstate_get_cpu_pstates() and make both
intel_pstate_cpu_init() and intel_cpufreq_cpu_init() call
that function in their non-HWP code paths.

The HWP code path in intel_pstate_cpu_init() does not need to update
the current P-state of the CPU directly at all because it is taken
care of the processor automatically, but the HWP code path of
intel_cpufreq_cpu_init() should update it in principle to
initialize the DESIRED_PERF field in MSR_HWP_REQUEST.  For this
purpose, make it call intel_cpufreq_hwp_update() and pass
the minimum P-state limit to it as the current target value along
with the current minimum and maximum limits.

Fixes: f6ebbcf08f ("cpufreq: intel_pstate: Implement passive mode with HWP enabled")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/5090465.GXAFRqVoOG@rafael.j.wysocki

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This commit is contained in:

Rafael J. Wysocki 2026-06-24 19:33:08 +02:00

parent 12a7f1aa06

commit db53c573d3

1 changed files with 11 additions and 8 deletions

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drivers/cpufreq/intel_pstate.c

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