cpufreq/amd-pstate: Fix a regression leading to EPP 0 after resume

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During the suspend sequence the cached CPPC request is destroyed
with the expectation that it's restored during resume.  This assumption
broke when the separate cache EPP variable was removed, and then it was
broken again by commit 608a76b652 ("cpufreq/amd-pstate: Add support
for the "Requested CPU Min frequency" BIOS option") which explicitly
set it to zero during suspend.

Remove the invalidation and set the value during the suspend call to
update limits so that the cached variable can be used to restore on
resume.

Fixes: 608a76b652 ("cpufreq/amd-pstate: Add support for the "Requested CPU Min frequency" BIOS option")
Fixes: b7a4115658 ("cpufreq/amd-pstate: Invalidate cppc_req_cached during suspend")
Reported-by: goldens <goldenspinach.rhbugzilla@gmail.com>
Closes: https://community.frame.work/t/increased-power-usage-after-resuming-from-suspend-on-ryzen-7040-kernel-6-15-regression/
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2391221
Tested-by: goldens <goldenspinach.rhbugzilla@gmail.com>
Tested-by: Willian Wang <kernel@willian.wang>
Reported-by: Vincent Mauirn <vincent.maurin.fr@gmail.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219981
Tested-by: Alex De Lorenzo <kernel@alexdelorenzo.dev>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Link: https://lore.kernel.org/r/20250826052747.2240670-1-superm1@kernel.org
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

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This commit is contained in:

Mario Limonciello (AMD) 2025-08-26 00:27:47 -05:00

parent 220abf77e7

commit ba3319e590

1 changed files with 5 additions and 4 deletions

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drivers/cpufreq/amd-pstate.c

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