diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-03-16 13:39:03 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-03-17 14:51:53 +0100 |
| commit | c42fa24b44751c62c86e98430ef915c0609a2ab8 (patch) | |
| tree | 18abd2aa653a3b5443236f6eb1a12586785a0e8a /drivers/acpi/cppc_acpi.c | |
| parent | 2ca8e6285250c07a2e5a22ecbfd59b5a4ef73484 (diff) | |
ACPI: bus: Avoid using CPPC if not supported by firmware
If the platform firmware indicates that it does not support CPPC by
clearing the OSC_SB_CPC_SUPPORT and OSC_SB_CPCV2_SUPPORT bits in the
platform _OSC capabilities mask, avoid attempting to evaluate _CPC
which may fail in that case.
Because the OSC_SB_CPC_SUPPORT and OSC_SB_CPCV2_SUPPORT bits are only
added to the supported platform capabilities mask on x86, when
X86_FEATURE_HWP is supported, allow _CPC to be evaluated regardless
in the other cases.
Link: https://lore.kernel.org/linux-acpi/CAJZ5v0i=ecAksq0TV+iLVObm-=fUfdqPABzzkgm9K6KxO1ZCcg@mail.gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/acpi/cppc_acpi.c')
| -rw-r--r-- | drivers/acpi/cppc_acpi.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 866560cbb082..3e89ad246b60 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -656,6 +656,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) acpi_status status; int ret = -EFAULT; + if (osc_sb_cppc_not_supported) + return -ENODEV; + /* Parse the ACPI _CPC table for this CPU. */ status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output, ACPI_TYPE_PACKAGE); |