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| author | Mario Limonciello (AMD) <superm1@kernel.org> | 2026-03-29 23:38:08 +0300 |
|---|---|---|
| committer | Mario Limonciello (AMD) <superm1@kernel.org> | 2026-04-02 19:29:11 +0300 |
| commit | da8afb1c666a4a966f0ab91dc336df4c855bc7b2 (patch) | |
| tree | f017aaaf8681a128acf3d4c8023f134c42a21b07 | |
| parent | e30ca6dd5345c5b8ba05f346a8e81105352fe571 (diff) | |
| download | linux-da8afb1c666a4a966f0ab91dc336df4c855bc7b2.tar.xz | |
cpufreq/amd-pstate: add kernel command line to override dynamic epp
Add `amd_dynamic_epp=enable` and `amd_dynamic_epp=disable` to override
the kernel configuration option `CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP`
locally.
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 7 | ||||
| -rw-r--r-- | Documentation/admin-guide/pm/amd-pstate.rst | 7 | ||||
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 11 |
3 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 03a550630644..9552819051cd 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -493,6 +493,13 @@ Kernel parameters disable Disable amd-pstate preferred core. + amd_dynamic_epp= + [X86] + disable + Disable amd-pstate dynamic EPP. + enable + Enable amd-pstate dynamic EPP. + amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: <a>,<b> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index bb1341763882..01e6ab10f996 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -474,6 +474,13 @@ For systems that support ``amd-pstate`` preferred core, the core rankings will always be advertised by the platform. But OS can choose to ignore that via the kernel parameter ``amd_prefcore=disable``. +``amd_dynamic_epp`` + +When AMD pstate is in auto mode, dynamic EPP will control whether the kernel +autonomously changes the EPP mode. The default is configured by +``CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP`` but can be explicitly enabled with +``amd_dynamic_epp=enable`` or disabled with ``amd_dynamic_epp=disable``. + User Space Interface in ``sysfs`` - General =========================================== diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 379e7dd44252..301e603e4966 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -2227,8 +2227,19 @@ static int __init amd_prefcore_param(char *str) return 0; } +static int __init amd_dynamic_epp_param(char *str) +{ + if (!strcmp(str, "disable")) + dynamic_epp = false; + if (!strcmp(str, "enable")) + dynamic_epp = true; + + return 0; +} + early_param("amd_pstate", amd_pstate_param); early_param("amd_prefcore", amd_prefcore_param); +early_param("amd_dynamic_epp", amd_dynamic_epp_param); MODULE_AUTHOR("Huang Rui <ray.huang@amd.com>"); MODULE_DESCRIPTION("AMD Processor P-state Frequency Driver"); |