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On some Meteor Lake platforms, maximum one core turbo frequency is not observed. During hybrid performance to frequency conversion, the maximum frequency is 100 MHz less. This results in requesting maximum frequency 100 MHz less. For example when the max one core turbo is 4.9 GHz: MSR HWP_CAPABILITIES shows highest performance ratio for P-core is 0x3E. With the current scaling factor of 78741 (1.27x for converting frequency to performance) results in max frequency of 4.8 GHz. This results in capping the max scaling frequency as 4.8 GHz, which is 100 MHz less than the desired. Add capability to define per CPU model specific scaling factor and define scaling factor of 80000 (1.25x for converting frequency to performance for P-cores) for Meteor Lake. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Debug message adjustment, subject edit ] 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.