linux-kernel - [PATCH 0/3] Improve usability for amd-pstate

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Message-ID: <20220325054228.5247-1-mario.limonciello@amd.com>
Date:   Fri, 25 Mar 2022 00:42:25 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Huang Rui <ray.huang@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
CC:     "open list:AMD PSTATE DRIVER" <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 0/3] Improve usability for amd-pstate

There has recently been some news coverage about `amd-pstate` being in
5.17, but this news also mentioned that it's a bit difficult to use.

You need to either block init calls, or compile the module into the kernel
to force it to take precedence over acpi-cpufreq.

This series aims to improve the usability of amd-pstate so that distros
can compile as a module, but users can still use it (relatively) easily.

A new module parameter is included that will force amd-pstate to take
precedence and a module table to let it load automatically on such systems.

With the patches in this series a user can make a file
/etc/modprobe.d/amd-pstate.conf:

options amd-pstate replace=1

Then upon the next reboot amd-pstate should load automatically even if
acpi-cpufreq was included on the system.
Mario Limonciello (3):
  cpufreq: Allow passing NULL as the argument for unregistering a driver
  cpufreq: amd-pstate: Allow replacing existing cpufreq drivers when
    loaded
  cpufreq: amd-pstate: Add a module device table

 drivers/cpufreq/amd-pstate.c | 19 ++++++++++++++++---
 drivers/cpufreq/cpufreq.c    |  4 ++--
 2 files changed, 18 insertions(+), 5 deletions(-)

-- 
2.34.1