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cpufreq/amd-pstate: Update cppc_req_cached for shared mem EPP writes

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On EPP only writes update the cached variable so that the min/max
performance controls don't need to be updated again.

Reviewed-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Mario Limonciello 2024-12-09 12:02:14 -06:00
parent 77fbea69b0
commit 1905fac6f9
1 changed files with 6 additions and 0 deletions
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6
drivers/cpufreq/amd-pstate.c
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@ -336,6 +336,7 @@ static int shmem_set_epp(struct cpufreq_policy *policy, u8 epp)
{
struct amd_cpudata *cpudata = policy->driver_data;
struct cppc_perf_ctrls perf_ctrls;
u64 value;
int ret;
if (trace_amd_pstate_epp_perf_enabled()) {
@ -362,6 +363,11 @@ static int shmem_set_epp(struct cpufreq_policy *policy, u8 epp)
}
WRITE_ONCE(cpudata->epp_cached, epp);
value = READ_ONCE(cpudata->cppc_req_cached);
value &= ~AMD_CPPC_EPP_PERF_MASK;
value |= FIELD_PREP(AMD_CPPC_EPP_PERF_MASK, epp);
WRITE_ONCE(cpudata->cppc_req_cached, value);
return ret;
}