Add a new function to enable CPPC feature. This function will write Continuous Performance Control package EnableRegister field on the processor. CPPC EnableRegister register described in section 8.4.7.1 of ACPI 6.4: This element is optional. If supported, contains a resource descriptor with a single Register() descriptor that describes a register to which OSPM writes a One to enable CPPC on this processor. Before this register is set, the processor will be controlled by legacy mechanisms (ACPI Pstates, firmware, etc.). This register will be used for AMD processors to enable AMD P-State function instead of legacy ACPI P-States. Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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