mirrors/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-10-30 16:18:41 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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>
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
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/cpufreq/amd-pstate.c
View file

@ -1628,13 +1628,14 @@ static int amd_pstate_suspend(struct cpufreq_policy *policy)
* min_perf value across kexec reboots. If this CPU is just resumed back without kexec,
* the limits, epp and desired perf will get reset to the cached values in cpudata struct
*/
ret = amd_pstate_update_perf(policy, perf.bios_min_perf, 0U, 0U, 0U, false);
ret = amd_pstate_update_perf(policy, perf.bios_min_perf,
FIELD_GET(AMD_CPPC_DES_PERF_MASK, cpudata->cppc_req_cached),
FIELD_GET(AMD_CPPC_MAX_PERF_MASK, cpudata->cppc_req_cached),
FIELD_GET(AMD_CPPC_EPP_PERF_MASK, cpudata->cppc_req_cached),
false);
if (ret)
return ret;
/* invalidate to ensure it's rewritten during resume */
cpudata->cppc_req_cached = 0;
/* set this flag to avoid setting core offline*/
cpudata->suspended = true;