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
config CPU_FREQ_GOV_ONDEMAND
tristate "'ondemand' cpufreq policy governor"
- depends on CPU_FREQ
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