If in doubt, say N.
+if CPU_FREQ
+
+config CPU_FREQ_TABLE
+ def_tristate m
+
config CPU_FREQ_DEBUG
bool "Enable CPUfreq debugging"
- depends on CPU_FREQ
help
Say Y here to enable CPUfreq subsystem (including drivers)
debugging. You will need to activate it via the kernel
config CPU_FREQ_STAT
tristate "CPU frequency translation statistics"
- depends on CPU_FREQ && CPU_FREQ_TABLE
+ select CPU_FREQ_TABLE
default y
help
This driver exports CPU frequency statistics information through sysfs
config CPU_FREQ_STAT_DETAILS
bool "CPU frequency translation statistics details"
- depends on CPU_FREQ && CPU_FREQ_STAT
- default n
+ depends on CPU_FREQ_STAT
help
This will show detail CPU frequency translation table in sysfs file
system
+# 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.
+
choice
prompt "Default CPUFreq governor"
- depends on CPU_FREQ
- default CPU_FREQ_DEFAULT_GOV_PERFORMANCE if !CPU_FREQ_SA1100 && !CPU_FREQ_SA1110
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_GOV_PERFORMANCE
tristate "'performance' governor"
- depends on CPU_FREQ
help
This cpufreq governor sets the frequency statically to the
highest available CPU frequency.
config CPU_FREQ_GOV_POWERSAVE
tristate "'powersave' governor"
- depends on CPU_FREQ
help
This cpufreq governor sets the frequency statically to the
lowest available CPU frequency.
config CPU_FREQ_GOV_USERSPACE
tristate "'userspace' governor for userspace frequency scaling"
- depends on CPU_FREQ
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/>
+ <http://www.lartmaker.nl/>.
For details, take a look at <file:Documentation/cpu-freq/>.
config CPU_FREQ_GOV_ONDEMAND
tristate "'ondemand' cpufreq policy governor"
- depends on CPU_FREQ
+ select CPU_FREQ_TABLE
help
'ondemand' - This driver adds a dynamic cpufreq policy governor.
The governor does a periodic polling and
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
+
+config CPU_FREQ_GOV_CONSERVATIVE
+ tristate "'conservative' cpufreq governor"
+ depends on CPU_FREQ
+ help
+ 'conservative' - this driver is rather similar to the 'ondemand'
+ governor both in its source code and its purpose, the difference is
+ its optimisation for better suitability in a battery powered
+ environment. The frequency is gracefully increased and decreased
+ rather than jumping to 100% when speed is required.
+
+ If you have a desktop machine then you should really be considering
+ the 'ondemand' governor instead, however if you are using a laptop,
+ PDA or even an AMD64 based computer (due to the unacceptable
+ step-by-step latency issues between the minimum and maximum frequency
+ transitions in the CPU) you will probably want to use this governor.
+
+ For details, take a look at linux/Documentation/cpu-freq.
+
+ If in doubt, say N.
+
+endif # CPU_FREQ