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| author |  Pierre Gondois <pierre.gondois@arm.com>
| 2022-05-18 11:08:58 +0200 |
|---|---|---|
| committer |  Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| 2022-05-19 19:45:34 +0200 |
| commit | 72f2ecb7ece7c1d89758d4929d98e95d95fe7199 (patch) | |
| tree | 265c667169067126f37c66b5d25981c1314cf650 /arch/x86/kernel | |
| parent | ACPI: CPPC: Check _OSC for flexible address space (diff) | |
| download | linux-72f2ecb7ece7.tar.gz linux-72f2ecb7ece7.tar.bz2 linux-72f2ecb7ece7.zip | |
ACPI: bus: Set CPPC _OSC bits for all and when CPPC_LIB is supported
The _OSC method allows the OS and firmware to communicate about
supported features/capabitlities. It also allows the OS to take
control of some features.
In ACPI 6.4, s6.2.11.2 Platform-Wide OSPM Capabilities, the CPPC
(resp. v2) bit should be set by the OS if it 'supports controlling
processor performance via the interfaces described in the _CPC
object'.
The OS supports CPPC and parses the _CPC object only if
CONFIG_ACPI_CPPC_LIB is set. Replace the x86 specific
boot_cpu_has(X86_FEATURE_HWP) dynamic check with an arch
generic CONFIG_ACPI_CPPC_LIB build-time check.
Note:
CONFIG_X86_INTEL_PSTATE selects CONFIG_ACPI_CPPC_LIB.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/kernel')
0 files changed, 0 insertions, 0 deletions