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Gautham R. Shenoy 86ed500813 cpufreq: ACPI: Fix max-frequency computation [ Upstream commit `0834667545` ] Commit `3c55e94c0a` ("cpufreq: ACPI: Extend frequency tables to cover boost frequencies") introduced an assumption in acpi_cpufreq_cpu_init() that the first entry in the P-state table was the nominal frequency. This assumption is incorrect. The frequency corresponding to the P0 P-State need not be the same as the nominal frequency advertised via CPPC. Since the driver is using the CPPC.highest_perf and CPPC.nominal_perf to compute the boost-ratio, it makes sense to use CPPC.nominal_freq to compute the max-frequency. CPPC.nominal_freq is advertised on platforms supporting CPPC revisions 3 or higher. Hence, fallback to using the first entry in the P-State table only on platforms that do not advertise CPPC.nominal_freq. Fixes: `3c55e94c0a` ("cpufreq: ACPI: Extend frequency tables to cover boost frequencies") Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Link: https://patch.msgid.link/20250113044107.566-1-gautham.shenoy@amd.com [ rjw: Retain reverse X-mas tree ordering of local variable declarations ] [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-02-21 13:49:04 +01:00
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README

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.