cpufreq/amd-pstate: Add dynamic energy performance preference

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Dynamic energy performance preference changes the EPP profile based on
whether the machine is running on AC or DC power.

A notification chain from the power supply core is used to adjust EPP
values on plug in or plug out events.

When enabled, the driver exposes a sysfs toggle for dynamic EPP, blocks
manual writes to energy_performance_preference while it "owns" the EPP
updates.

For non-server systems:
    * the default EPP for AC mode is `performance`.
    * the default EPP for DC mode is `balance_performance`.

For server systems dynamic EPP is mostly a no-op.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

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This commit is contained in:

Mario Limonciello (AMD) 2026-03-29 15:38:07 -05:00

parent a362ae6e7e

commit e30ca6dd53

4 changed files with 160 additions and 8 deletions

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18

Documentation/admin-guide/pm/amd-pstate.rst

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12

drivers/cpufreq/Kconfig.x86

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128

drivers/cpufreq/amd-pstate.c

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10

drivers/cpufreq/amd-pstate.h

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