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Rafael J. Wysocki
46c435cbaf
So far, HWP has never been enabled without EPP (Energy-Performance Preference) interface support, since the lack of the latter indicates an incomplete implementation of HWP, which was the case on early development vehicle platforms. However, HWP can be expected to work if DEC (Dynamic Efficiency Control) is enabled as indicated by setting bit 27 in MSR_IA32_POWER_CTL (DEC enable bit). Accordingly, allow HWP to be enabled if the EPP interface is not supported so long as DEC is enabled in the processor. Still, the EPP control sysfs interface is useless when EPP is not supported, so do not expose it in that case. Link: https://lore.kernel.org/linux-pm/20250904000608.260817-2-srinivas.pandruvada@linux.intel.com/ Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Co-developed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.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 reStructuredText 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.