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cpufreq: amd_pstate: map desired perf into pstate scope for powersave governor

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The patch will fix the invalid desired perf value for powersave
governor. This issue is found when testing on one AMD EPYC system, the
actual des_perf is smaller than the min_perf value, that is invalid
value. because the min_perf is the lowest_perf system can support in
idle state.

Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Perry Yuan 2022-08-15 00:35:46 +08:00 committed by Rafael J. Wysocki
parent b185c5053c
commit 0e9a86386b
1 changed files with 1 additions and 2 deletions
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3
drivers/cpufreq/amd-pstate.c
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@ -269,6 +269,7 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
u64 prev = READ_ONCE(cpudata->cppc_req_cached);
u64 value = prev;
des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
value &= ~AMD_CPPC_MIN_PERF(~0L);
value |= AMD_CPPC_MIN_PERF(min_perf);
@ -357,8 +358,6 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (max_perf < min_perf)
max_perf = min_perf;
des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true);
}