diff options
| author | Mario Limonciello <mario.limonciello@amd.com> | 2026-05-12 17:19:47 -0500 |
|---|---|---|
| committer | Mario Limonciello (AMD) <superm1@kernel.org> | 2026-05-14 08:47:48 -0500 |
| commit | e4e9b7b38d5db2cc6a8770bc0596bb8b36b92b1f (patch) | |
| tree | f66a2d7dbbdacaf70107c4ef2de1dd8642544780 /drivers/cpufreq | |
| parent | f9f16835d4dc46113c0a72625ffbf61f1aa95e5c (diff) | |
cpufreq/amd-pstate: Drop Kconfig option for dynamic EPP
There are some performance issues being identified by dynamic EPP
and we don't want to have distributions turning it on by default
exposing them to users at this time.
Drop the kconfig option, and require an explicit opt in from kernel
command line or runtime sysfs option to turn it on.
Reported-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de>
Closes: https://lore.kernel.org/linux-pm/14a87c99-785c-4b16-bfce-35ecbf053448@freenet.de/
Reported-by: Stuart Meckle <stuartmeckle@gmail.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=221473
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://lore.kernel.org/r/20260512221947.1652988-1-mario.limonciello@amd.com
(fix sysfs file path)
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/Kconfig.x86 | 12 | ||||
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 4 |
2 files changed, 0 insertions, 16 deletions
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 index 027e6ea2e038..a9093cd5e5d1 100644 --- a/drivers/cpufreq/Kconfig.x86 +++ b/drivers/cpufreq/Kconfig.x86 @@ -70,18 +70,6 @@ config X86_AMD_PSTATE_DEFAULT_MODE For details, take a look at: <file:Documentation/admin-guide/pm/amd-pstate.rst>. -config X86_AMD_PSTATE_DYNAMIC_EPP - bool "AMD Processor P-State dynamic EPP support" - depends on X86_AMD_PSTATE - default n - help - Allow the kernel to dynamically change the energy performance - value from events like ACPI platform profile and AC adapter plug - events. - - This feature can also be changed at runtime, this configuration - option only sets the kernel default value behavior. - config X86_AMD_PSTATE_UT tristate "selftest for AMD Processor P-State driver" depends on X86 && ACPI_PROCESSOR diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 9eb9c3f4e809..62b5d995281d 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -87,11 +87,7 @@ static struct cpufreq_driver amd_pstate_driver; static struct cpufreq_driver amd_pstate_epp_driver; static int cppc_state = AMD_PSTATE_UNDEFINED; static bool amd_pstate_prefcore = true; -#ifdef CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP -static bool dynamic_epp = CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP; -#else static bool dynamic_epp; -#endif static struct quirk_entry *quirks; /* |