# SPDX-License-Identifier: GPL-2.0-only
#
# x86 CPU Frequency scaling drivers
#
config [31mCONFIG_X86_INTEL_PSTATE[0m
bool "Intel P state control"
depends on [31mCONFIG_X86[0m
select [31mCONFIG_ACPI_PROCESSOR[0m if [31mCONFIG_ACPI[0m
select [31mCONFIG_ACPI_CPPC_LIB[0m if [31mCONFIG_X86_64[0m && [31mCONFIG_ACPI[0m && [31mCONFIG_SCHED_MC_PRIO[0m
help
This driver provides a P state for Intel core processors.
The driver implements an internal governor and will become
the scaling driver and governor for Sandy bridge processors.
When this driver is enabled it will become the preferred
scaling driver for Sandy bridge processors.
If in doubt, say N.
config [31mCONFIG_X86_PCC_CPUFREQ[0m
tristate "Processor Clocking Control interface driver"
depends on [31mCONFIG_ACPI[0m && [31mCONFIG_ACPI_PROCESSOR[0m
help
This driver adds support for the [31mCONFIG_PCC[0m interface.
For details, take a look at:
<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
To compile this driver as a module, choose [31mCONFIG_M[0m here: the
module will be called pcc-cpufreq.
If in doubt, say N.
config [31mCONFIG_X86_ACPI_CPUFREQ[0m
tristate "ACPI Processor P-States driver"
depends on [31mCONFIG_ACPI_PROCESSOR[0m
help
This driver adds a CPUFreq driver which utilizes the [31mCONFIG_ACPI[0m
Processor Performance States.
This driver also supports Intel Enhanced Speedstep and newer
AMD CPUs.
To compile this driver as a module, choose [31mCONFIG_M[0m here: the
module will be called acpi-cpufreq.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_ACPI_CPUFREQ_CPB[0m
default y
bool "Legacy cpb sysfs knob support for AMD CPUs"
depends on [31mCONFIG_X86_ACPI_CPUFREQ[0m && [31mCONFIG_CPU_SUP_AMD[0m
help
The powernow-k8 driver used to provide a sysfs knob called "cpb"
to disable the Core Performance Boosting feature of AMD CPUs. This
file has now been superseded by the more generic "boost" entry.
By enabling this option the acpi_cpufreq driver provides the old
entry in addition to the new boost ones, for compatibility reasons.
config [31mCONFIG_X86_SFI_CPUFREQ[0m
tristate "SFI Performance-States driver"
depends on [31mCONFIG_X86_INTEL_MID[0m && [31mCONFIG_SFI[0m
help
This adds a CPUFreq driver for some Silvermont based Intel Atom
architectures like Z34xx and Z35xx which enumerate processor
performance states through [31mCONFIG_SFI[0m.
If in doubt, say N.
config [31mCONFIG_ELAN_CPUFREQ[0m
tristate "AMD Elan SC400 and SC410"
depends on [31mCONFIG_MELAN[0m
---help---
This adds the CPUFreq driver for AMD Elan SC400 and SC410
processors.
You need to specify the processor maximum speed as boot
parameter: elanfreq=maxspeed (in kHz) or as module
parameter "max_freq".
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_SC520_CPUFREQ[0m
tristate "AMD Elan SC520"
depends on [31mCONFIG_MELAN[0m
---help---
This adds the CPUFreq driver for AMD Elan SC520 processor.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_POWERNOW_K6[0m
tristate "AMD Mobile K6-2/K6-3 PowerNow!"
depends on [31mCONFIG_X86_32[0m
help
This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
AMD K6-3+ processors.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_POWERNOW_K7[0m
tristate "AMD Mobile Athlon/Duron PowerNow!"
depends on [31mCONFIG_X86_32[0m
help
This adds the CPUFreq driver for mobile AMD K7 mobile processors.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_POWERNOW_K7_ACPI[0m
bool
depends on [31mCONFIG_X86_POWERNOW_K7[0m && [31mCONFIG_ACPI_PROCESSOR[0m
depends on !([31mCONFIG_X86_POWERNOW_K7[0m = y && [31mCONFIG_ACPI_PROCESSOR[0m = m)
depends on [31mCONFIG_X86_32[0m
default y
config [31mCONFIG_X86_POWERNOW_K8[0m
tristate "AMD Opteron/Athlon64 PowerNow!"
depends on [31mCONFIG_ACPI[0m && [31mCONFIG_ACPI_PROCESSOR[0m && [31mCONFIG_X86_ACPI_CPUFREQ[0m
help
This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
Support for K10 and newer processors is now in acpi-cpufreq.
To compile this driver as a module, choose [31mCONFIG_M[0m here: the
module will be called powernow-k8.
For details, take a look at <file:Documentation/cpu-freq/>.
config [31mCONFIG_X86_AMD_FREQ_SENSITIVITY[0m
tristate "AMD frequency sensitivity feedback powersave bias"
depends on [31mCONFIG_CPU_FREQ_GOV_ONDEMAND[0m && [31mCONFIG_X86_ACPI_CPUFREQ[0m && [31mCONFIG_CPU_SUP_AMD[0m
help
This adds AMD-specific powersave bias function to the ondemand
governor, which allows it to make more power-conscious frequency
change decisions based on feedback from hardware (available on AMD
Family 16h and above).
Hardware feedback tells software how "sensitive" to frequency changes
the CPUs' workloads are. CPU-bound workloads will be more sensitive
-- they will perform better as frequency increases. Memory/IO-bound
workloads will be less sensitive -- they will not necessarily perform
better as frequency increases.
If in doubt, say N.
config [31mCONFIG_X86_GX_SUSPMOD[0m
tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
depends on [31mCONFIG_X86_32[0m && [31mCONFIG_PCI[0m
help
This add the CPUFreq driver for NatSemi Geode processors which
support suspend modulation.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_SPEEDSTEP_CENTRINO[0m
tristate "Intel Enhanced SpeedStep (deprecated)"
select [31mCONFIG_X86_SPEEDSTEP_CENTRINO_TABLE[0m if [31mCONFIG_X86_32[0m
depends on [31mCONFIG_X86_32[0m || ([31mCONFIG_X86_64[0m && [31mCONFIG_ACPI_PROCESSOR[0m)
help
This is deprecated and this functionality is now merged into
acpi_cpufreq ([31mCONFIG_X86_ACPI_CPUFREQ[0m). Use that driver instead of
speedstep_centrino.
This adds the CPUFreq driver for Enhanced SpeedStep enabled
mobile CPUs. This means Intel Pentium [31mCONFIG_M[0m (Centrino) CPUs
or 64bit enabled Intel Xeons.
To compile this driver as a module, choose [31mCONFIG_M[0m here: the
module will be called speedstep-centrino.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_SPEEDSTEP_CENTRINO_TABLE[0m
bool "Built-in tables for Banias CPUs"
depends on [31mCONFIG_X86_32[0m && [31mCONFIG_X86_SPEEDSTEP_CENTRINO[0m
default y
help
Use built-in tables for Banias CPUs if [31mCONFIG_ACPI[0m encoding
is not available.
If in doubt, say N.
config [31mCONFIG_X86_SPEEDSTEP_ICH[0m
tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
depends on [31mCONFIG_X86_32[0m
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-[31mCONFIG_M[0m (Tualatin) and all
mobile Intel Pentium 4 P4-[31mCONFIG_M[0m on systems which have an Intel ICH2,
ICH3 or ICH4 southbridge.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_SPEEDSTEP_SMI[0m
tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
depends on [31mCONFIG_X86_32[0m
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-[31mCONFIG_M[0m (Tualatin)
on systems which have an Intel 440BX/ZX/MX southbridge.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_P4_CLOCKMOD[0m
tristate "Intel Pentium 4 clock modulation"
help
This adds the CPUFreq driver for Intel Pentium 4 / XEON
processors. When enabled it will lower CPU temperature by skipping
clocks.
This driver should be only used in exceptional
circumstances when very low power is needed because it causes severe
slowdowns and noticeable latencies. Normally Speedstep should be used
instead.
To compile this driver as a module, choose [31mCONFIG_M[0m here: the
module will be called p4-clockmod.
For details, take a look at <file:Documentation/cpu-freq/>.
Unless you are absolutely sure say N.
config [31mCONFIG_X86_CPUFREQ_NFORCE2[0m
tristate "nVidia nForce2 FSB changing"
depends on [31mCONFIG_X86_32[0m
help
This adds the CPUFreq driver for FSB changing on nVidia nForce2
platforms.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_LONGRUN[0m
tristate "Transmeta LongRun"
depends on [31mCONFIG_X86_32[0m
help
This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
which support LongRun.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_LONGHAUL[0m
tristate "VIA Cyrix III Longhaul"
depends on [31mCONFIG_X86_32[0m && [31mCONFIG_ACPI_PROCESSOR[0m
help
This adds the CPUFreq driver for VIA Samuel/CyrixIII,
VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
processors.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config [31mCONFIG_X86_E_POWERSAVER[0m
tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
depends on [31mCONFIG_X86_32[0m && [31mCONFIG_ACPI_PROCESSOR[0m
help
This adds the CPUFreq driver for VIA C7 processors. However, this driver
does not have any safeguards to prevent operating the CPU out of spec
and is thus considered dangerous. Please use the regular [31mCONFIG_ACPI[0m cpufreq
driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
If in doubt, say N.
comment "shared options"
config [31mCONFIG_X86_SPEEDSTEP_LIB[0m
tristate
default ([31mCONFIG_X86_SPEEDSTEP_ICH[0m || [31mCONFIG_X86_SPEEDSTEP_SMI[0m || [31mCONFIG_X86_P4_CLOCKMOD[0m)
config [31mCONFIG_X86_SPEEDSTEP_RELAXED_CAP_CHECK[0m
bool "Relaxed speedstep capability checks"
depends on [31mCONFIG_X86_32[0m && ([31mCONFIG_X86_SPEEDSTEP_SMI[0m || [31mCONFIG_X86_SPEEDSTEP_ICH[0m)
help
Don't perform all checks for a speedstep capable system which would
normally be done. Some ancient or strange systems, though speedstep
capable, don't always indicate that they are speedstep capable. This
option lets the probing code bypass some of those checks if the
parameter "relaxed_check=1" is passed to the module.