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cpufreq/amd-pstate: Invalidate cppc_req_cached during suspend

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During resume it's possible the firmware didn't restore the CPPC request
MSR but the kernel thinks the values line up. This leads to incorrect
performance after resume from suspend.

To fix the issue invalidate the cached value at suspend. During resume use
the saved values programmed as cached limits.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Reported-by: Miroslav Pavleski <miroslav@pavleski.net>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217931
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Mario Limonciello 2025-02-17 13:28:51 -06:00
parent a1d1d8fb65
commit b7a4115658
1 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/cpufreq/amd-pstate.c
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@ -1605,7 +1605,7 @@ static int amd_pstate_epp_reenable(struct cpufreq_policy *policy)
max_perf, policy->boost_enabled); max_perf, policy->boost_enabled);
} }
return amd_pstate_update_perf(cpudata, 0, 0, max_perf, cpudata->epp_cached, false); return amd_pstate_epp_update_limit(policy);
} }
static int amd_pstate_epp_cpu_online(struct cpufreq_policy *policy) static int amd_pstate_epp_cpu_online(struct cpufreq_policy *policy)
@ -1654,6 +1654,9 @@ static int amd_pstate_epp_suspend(struct cpufreq_policy *policy)
if (cppc_state != AMD_PSTATE_ACTIVE) if (cppc_state != AMD_PSTATE_ACTIVE)
return 0; return 0;
/* invalidate to ensure it's rewritten during resume */
cpudata->cppc_req_cached = 0;
/* set this flag to avoid setting core offline*/ /* set this flag to avoid setting core offline*/
cpudata->suspended = true; cpudata->suspended = true;