diff options
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 89bda7a2bb8d..259a917da75f 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1834,20 +1834,34 @@ static bool amd_cppc_supported(void) } /* - * If the CPPC feature is disabled in the BIOS for processors that support MSR-based CPPC, - * the AMD Pstate driver may not function correctly. - * Check the CPPC flag and display a warning message if the platform supports CPPC. - * Note: below checking code will not abort the driver registeration process because of - * the code is added for debugging purposes. + * If the CPPC feature is disabled in the BIOS for processors + * that support MSR-based CPPC, the AMD Pstate driver may not + * function correctly. + * + * For such processors, check the CPPC flag and display a + * warning message if the platform supports CPPC. + * + * Note: The code check below will not abort the driver + * registration process because of the code is added for + * debugging purposes. Besides, it may still be possible for + * the driver to work using the shared-memory mechanism. */ if (!cpu_feature_enabled(X86_FEATURE_CPPC)) { - if (cpu_feature_enabled(X86_FEATURE_ZEN1) || cpu_feature_enabled(X86_FEATURE_ZEN2)) { - if (c->x86_model > 0x60 && c->x86_model < 0xaf) + if (cpu_feature_enabled(X86_FEATURE_ZEN2)) { + switch (c->x86_model) { + case 0x60 ... 0x6F: + case 0x80 ... 0xAF: warn = true; - } else if (cpu_feature_enabled(X86_FEATURE_ZEN3) || cpu_feature_enabled(X86_FEATURE_ZEN4)) { - if ((c->x86_model > 0x10 && c->x86_model < 0x1F) || - (c->x86_model > 0x40 && c->x86_model < 0xaf)) + break; + } + } else if (cpu_feature_enabled(X86_FEATURE_ZEN3) || + cpu_feature_enabled(X86_FEATURE_ZEN4)) { + switch (c->x86_model) { + case 0x10 ... 0x1F: + case 0x40 ... 0xAF: warn = true; + break; + } } else if (cpu_feature_enabled(X86_FEATURE_ZEN5)) { warn = true; } |