2005-04-16 22:20:36 +00:00
|
|
|
config CPU_FREQ
|
|
|
|
|
bool "CPU Frequency scaling"
|
|
|
|
|
help
|
|
|
|
|
CPU Frequency scaling allows you to change the clock speed of
|
|
|
|
|
CPUs on the fly. This is a nice method to save power, because
|
|
|
|
|
the lower the CPU clock speed, the less power the CPU consumes.
|
|
|
|
|
|
|
|
|
|
Note that this driver doesn't automatically change the CPU
|
|
|
|
|
clock speed, you need to either enable a dynamic cpufreq governor
|
|
|
|
|
(see below) after boot, or use a userspace tool.
|
|
|
|
|
|
|
|
|
|
For details, take a look at <file:Documentation/cpu-freq>.
|
|
|
|
|
|
|
|
|
|
If in doubt, say N.
|
|
|
|
|
|
|
|
|
|
if CPU_FREQ
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_TABLE
|
|
|
|
|
def_tristate m
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_DEBUG
|
|
|
|
|
bool "Enable CPUfreq debugging"
|
|
|
|
|
help
|
|
|
|
|
Say Y here to enable CPUfreq subsystem (including drivers)
|
|
|
|
|
debugging. You will need to activate it via the kernel
|
|
|
|
|
command line by passing
|
|
|
|
|
cpufreq.debug=<value>
|
|
|
|
|
|
|
|
|
|
To get <value>, add
|
|
|
|
|
1 to activate CPUfreq core debugging,
|
|
|
|
|
2 to activate CPUfreq drivers debugging, and
|
|
|
|
|
4 to activate CPUfreq governor debugging
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_STAT
|
|
|
|
|
tristate "CPU frequency translation statistics"
|
|
|
|
|
select CPU_FREQ_TABLE
|
|
|
|
|
default y
|
|
|
|
|
help
|
|
|
|
|
This driver exports CPU frequency statistics information through sysfs
|
|
|
|
|
file system
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_STAT_DETAILS
|
|
|
|
|
bool "CPU frequency translation statistics details"
|
|
|
|
|
depends on CPU_FREQ_STAT
|
|
|
|
|
help
|
|
|
|
|
This will show detail CPU frequency translation table in sysfs file
|
|
|
|
|
system
|
|
|
|
|
|
2005-06-01 02:03:44 +00:00
|
|
|
# Note that it is not currently possible to set the other governors (such as ondemand)
|
|
|
|
|
# as the default, since if they fail to initialise, cpufreq will be
|
|
|
|
|
# left in an undefined state.
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
choice
|
|
|
|
|
prompt "Default CPUFreq governor"
|
|
|
|
|
default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
|
|
|
|
|
default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
|
|
|
|
|
help
|
|
|
|
|
This option sets which CPUFreq governor shall be loaded at
|
|
|
|
|
startup. If in doubt, select 'performance'.
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
|
|
|
|
|
bool "performance"
|
|
|
|
|
select CPU_FREQ_GOV_PERFORMANCE
|
|
|
|
|
help
|
|
|
|
|
Use the CPUFreq governor 'performance' as default. This sets
|
|
|
|
|
the frequency statically to the highest frequency supported by
|
|
|
|
|
the CPU.
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_DEFAULT_GOV_USERSPACE
|
|
|
|
|
bool "userspace"
|
|
|
|
|
select CPU_FREQ_GOV_USERSPACE
|
|
|
|
|
help
|
|
|
|
|
Use the CPUFreq governor 'userspace' as default. This allows
|
|
|
|
|
you to set the CPU frequency manually or when an userspace
|
|
|
|
|
program shall be able to set the CPU dynamically without having
|
|
|
|
|
to enable the userspace governor manually.
|
|
|
|
|
|
|
|
|
|
endchoice
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_GOV_PERFORMANCE
|
|
|
|
|
tristate "'performance' governor"
|
|
|
|
|
help
|
|
|
|
|
This cpufreq governor sets the frequency statically to the
|
|
|
|
|
highest available CPU frequency.
|
|
|
|
|
|
|
|
|
|
If in doubt, say Y.
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_GOV_POWERSAVE
|
|
|
|
|
tristate "'powersave' governor"
|
|
|
|
|
help
|
|
|
|
|
This cpufreq governor sets the frequency statically to the
|
|
|
|
|
lowest available CPU frequency.
|
|
|
|
|
|
|
|
|
|
If in doubt, say Y.
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_GOV_USERSPACE
|
|
|
|
|
tristate "'userspace' governor for userspace frequency scaling"
|
|
|
|
|
help
|
|
|
|
|
Enable this cpufreq governor when you either want to set the
|
|
|
|
|
CPU frequency manually or when an userspace program shall
|
|
|
|
|
be able to set the CPU dynamically, like on LART
|
|
|
|
|
<http://www.lart.tudelft.nl/>
|
|
|
|
|
|
|
|
|
|
For details, take a look at <file:Documentation/cpu-freq/>.
|
|
|
|
|
|
|
|
|
|
If in doubt, say Y.
|
|
|
|
|
|
|
|
|
|
config CPU_FREQ_GOV_ONDEMAND
|
|
|
|
|
tristate "'ondemand' cpufreq policy governor"
|
|
|
|
|
help
|
|
|
|
|
'ondemand' - This driver adds a dynamic cpufreq policy governor.
|
|
|
|
|
The governor does a periodic polling and
|
|
|
|
|
changes frequency based on the CPU utilization.
|
|
|
|
|
The support for this governor depends on CPU capability to
|
|
|
|
|
do fast frequency switching (i.e, very low latency frequency
|
|
|
|
|
transitions).
|
|
|
|
|
|
|
|
|
|
For details, take a look at linux/Documentation/cpu-freq.
|
|
|
|
|
|
|
|
|
|
If in doubt, say N.
|
|
|
|
|
|
|
|
|
|
endif # CPU_FREQ
|
