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# x86 CPU Frequency scaling drivers
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config X86_INTEL_PSTATE
bool "Intel P state control"
depends on X86
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 perferred
scaling driver for Sandy bridge processors.
If in doubt, say N.
config X86_PCC_CPUFREQ
tristate "Processor Clocking Control interface driver"
depends on ACPI && ACPI_PROCESSOR
help
This driver adds support for the PCC interface.
For details, take a look at:
<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
To compile this driver as a module, choose M here: the
module will be called pcc-cpufreq.
If in doubt, say N.
config X86_ACPI_CPUFREQ
tristate "ACPI Processor P-States driver"
select CPU_FREQ_TABLE
depends on ACPI_PROCESSOR
help
This driver adds a CPUFreq driver which utilizes the ACPI
Processor Performance States.
This driver also supports Intel Enhanced Speedstep and newer
AMD CPUs.
To compile this driver as a module, choose M here: the
module will be called acpi-cpufreq.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config X86_ACPI_CPUFREQ_CPB
default y
bool "Legacy cpb sysfs knob support for AMD CPUs"
depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
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 superseeded 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 ELAN_CPUFREQ
tristate "AMD Elan SC400 and SC410"
select CPU_FREQ_TABLE
depends on MELAN
---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 SC520_CPUFREQ
tristate "AMD Elan SC520"
select CPU_FREQ_TABLE
depends on MELAN
---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 X86_POWERNOW_K6
tristate "AMD Mobile K6-2/K6-3 PowerNow!"
select CPU_FREQ_TABLE
depends on X86_32
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 X86_POWERNOW_K7
tristate "AMD Mobile Athlon/Duron PowerNow!"
select CPU_FREQ_TABLE
depends on X86_32
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 X86_POWERNOW_K7_ACPI
bool
depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
depends on X86_32
default y
config X86_POWERNOW_K8
tristate "AMD Opteron/Athlon64 PowerNow!"
select CPU_FREQ_TABLE
depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
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 M here: the
module will be called powernow-k8.
For details, take a look at <file:Documentation/cpu-freq/>.
config X86_AMD_FREQ_SENSITIVITY
tristate "AMD frequency sensitivity feedback powersave bias"
depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
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 (availble 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 X86_GX_SUSPMOD
tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
depends on X86_32 && PCI
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 X86_SPEEDSTEP_CENTRINO
tristate "Intel Enhanced SpeedStep (deprecated)"
select CPU_FREQ_TABLE
select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
help
This is deprecated and this functionality is now merged into
acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
speedstep_centrino.
This adds the CPUFreq driver for Enhanced SpeedStep enabled
mobile CPUs. This means Intel Pentium M (Centrino) CPUs
or 64bit enabled Intel Xeons.
To compile this driver as a module, choose M here: the
module will be called speedstep-centrino.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config X86_SPEEDSTEP_CENTRINO_TABLE
bool "Built-in tables for Banias CPUs"
depends on X86_32 && X86_SPEEDSTEP_CENTRINO
default y
help
Use built-in tables for Banias CPUs if ACPI encoding
is not available.
If in doubt, say N.
config X86_SPEEDSTEP_ICH
tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
select CPU_FREQ_TABLE
depends on X86_32
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
mobile Intel Pentium 4 P4-M 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 X86_SPEEDSTEP_SMI
tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
select CPU_FREQ_TABLE
depends on X86_32
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-M (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 X86_P4_CLOCKMOD
tristate "Intel Pentium 4 clock modulation"
select CPU_FREQ_TABLE
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 M 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 X86_CPUFREQ_NFORCE2
tristate "nVidia nForce2 FSB changing"
depends on X86_32
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 X86_LONGRUN
tristate "Transmeta LongRun"
depends on X86_32
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 X86_LONGHAUL
tristate "VIA Cyrix III Longhaul"
select CPU_FREQ_TABLE
depends on X86_32 && ACPI_PROCESSOR
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 X86_E_POWERSAVER
tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
select CPU_FREQ_TABLE
depends on X86_32
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 ACPI cpufreq
driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
If in doubt, say N.
comment "shared options"
config X86_SPEEDSTEP_LIB
tristate
default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
config X86_SPEEDSTEP_RELAXED_CAP_CHECK
bool "Relaxed speedstep capability checks"
depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
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.
