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#
# CPU Frequency scaling
#
menu "CPU Frequency scaling"
source "drivers/cpufreq/Kconfig"
config CPU_FREQ_TABLE
tristate "CPU frequency table helpers"
depends on CPU_FREQ
default y
help
Many CPUFreq drivers use these helpers, so only say N here if
the CPUFreq driver of your choice doesn't need these helpers.
If in doubt, say Y.
comment "CPUFreq processor drivers"
depends on CPU_FREQ
config X86_POWERNOW_K8
tristate "AMD Opteron/Athlon64 PowerNow!"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config X86_POWERNOW_K8_ACPI
bool
depends on ((X86_POWERNOW_K8 = "m" && ACPI_PROCESSOR) || (X86_POWERNOW_K8 = "y" && ACPI_PROCESSOR = "y"))
default y
config X86_SPEEDSTEP_CENTRINO
tristate "Intel Enhanced SpeedStep"
depends on CPU_FREQ_TABLE && ACPI_PROCESSOR
help
This adds the CPUFreq driver for Enhanced SpeedStep enabled
mobile CPUs. This means Intel Pentium M (Centrino) CPUs
or 64bit enabled Intel Xeons.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
config X86_SPEEDSTEP_CENTRINO_ACPI
bool
depends on X86_SPEEDSTEP_CENTRINO
default y
config X86_ACPI_CPUFREQ
tristate "ACPI Processor P-States driver"
depends on CPU_FREQ_TABLE && ACPI_PROCESSOR
help
This driver adds a CPUFreq driver which utilizes the ACPI
Processor Performance States.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
comment "shared options"
depends on CPU_FREQ
config X86_ACPI_CPUFREQ_PROC_INTF
bool "/proc/acpi/processor/../performance interface (deprecated)"
depends on PROC_FS
depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K8_ACPI
help
This enables the deprecated /proc/acpi/processor/../performance
interface. While it is helpful for debugging, the generic,
cross-architecture cpufreq interfaces should be used.
If in doubt, say N.
config X86_P4_CLOCKMOD
tristate "Intel Pentium 4 clock modulation"
depends on CPU_FREQ_TABLE && EMBEDDED
help
This adds the clock modulation 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.
For details, take a look at <file:Documentation/cpu-freq/>.
Unless you are absolutely sure say N.
config X86_SPEEDSTEP_LIB
tristate
depends on (X86_P4_CLOCKMOD)
default (X86_P4_CLOCKMOD)
endmenu
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