From: Mario Limonciello <mario.limonciello@xxxxxxx> There are two major ways to tune platform performance in Linux: * ACPI platform profile * Manually tuning APU performance Changing the ACPI platform profile is a "one stop shop" to change performance limits and fan curves all at the same time. On AMD systems the manual tuning methods typically involve changing values of settings such as fPPT, sPPT or SPL. The problem with changing these settings manually is that the definition of the ACPI platform profile if supported by the hardware is no longer accurate. At best this can cause misrepresenting the state of the platform to userspace and at worst can cause the state machine into an invalid state. The existence and continued development of projects such as ryzenadj which manipulate debugging interfaces show there is a demand for manually tuning performance. Furthermore some systems (such as ASUS and Lenovo handhelds) offer an ACPI-WMI interface for changing these settings. If using anything outside that WMI interface the state will be wrong. If using that WMI interface the platform profile will be wrong. This series introduces a "custom" ACPI platform profile and adds support for the AMD PMF driver to use it when a user has enabled manual adjustments. If agreeable a similar change should be made to asus-armoury and any other drivers that export the ability to change these settings but also a platform profile. Mario Limonciello (2): ACPI: Add support for a 'custom' profile platform/x86/amd: pmf: Add manual control support Documentation/ABI/testing/sysfs-amd-pmf | 10 +++ .../ABI/testing/sysfs-platform_profile | 1 + drivers/acpi/platform_profile.c | 1 + drivers/platform/x86/amd/pmf/Makefile | 1 + drivers/platform/x86/amd/pmf/core.c | 9 ++ drivers/platform/x86/amd/pmf/manual.c | 88 +++++++++++++++++++ drivers/platform/x86/amd/pmf/pmf.h | 5 ++ drivers/platform/x86/amd/pmf/sps.c | 4 + include/linux/platform_profile.h | 1 + 9 files changed, 120 insertions(+) create mode 100644 drivers/platform/x86/amd/pmf/manual.c -- 2.43.0
