On Wed, May 11, 2022 at 03:45:56PM +0200, Pierre Gondois wrote: > 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. While this is work as per the spec, by not sure what kind of ACPI firmware are in the wild. So be prepared to relax/constrain to original feature check for x86, unfortunate but may be needed. Anyways, Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx> -- Regards, Sudeep
