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According to the ACPI v6.2 (and later) specification, SystemIO can be used for _CPC registers. This teaches cppc_acpi how to handle such registers. This patch was tested using the amd_pstate driver on my Zephyrus G15 (model GA503QS) using the current version 410 BIOS, which uses a SystemIO register for the HighestPerformance element in _CPC. Signed-off-by: Steven Noonan <steven@valvesoftware.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.