diff options
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 0b4a4d69c14d..576251e61ce0 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -311,6 +311,12 @@ static inline int msr_cppc_enable(bool enable) int ret, cpu; unsigned long logical_proc_id_mask = 0; + /* + * MSR_AMD_CPPC_ENABLE is write-once, once set it cannot be cleared. + */ + if (!enable) + return 0; + if (enable == cppc_enabled) return 0; |