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path: root/drivers/cpufreq/Kconfig
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menu "CPU Frequency scaling"

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 HAS_BLUETOOTH_DEADLOCKS
	bool "System has bluetooth deadlocks"
	depends on BT_BCM4334
	default y
	help
	  It seems that Android Lollipop introduced a bug which causes an
	  event listener to deadlock when A2DP is used and governor forces
	  only one core to stay awake. This hack prevents such situation by
	  always leaving at least two cores online. I wish we could get rid
	  of this at some point.

config CPU_FREQ_TABLE
	tristate

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.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_stats.

	  If in doubt, say N.

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.

	  If in doubt, say N.

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_POWERSAVE
	bool "powersave"
	depends on EXPERT
	select CPU_FREQ_GOV_POWERSAVE
	help
	  Use the CPUFreq governor 'powersave' as default. This sets
	  the frequency statically to the lowest 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 a userspace 
	  program shall be able to set the CPU dynamically without having
	  to enable the userspace governor manually.

config CPU_FREQ_DEFAULT_GOV_ONDEMAND
	bool "ondemand"
	select CPU_FREQ_GOV_ONDEMAND
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'ondemand' as default. This allows
	  you to get a full dynamic frequency capable system by simply
	  loading your cpufreq low-level hardware driver.
	  Be aware that not all cpufreq drivers support the ondemand
	  governor. If unsure have a look at the help section of the
	  driver. Fallback governor will be the performance governor.

config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
	bool "conservative"
	select CPU_FREQ_GOV_CONSERVATIVE
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'conservative' as default. This allows
	  you to get a full dynamic frequency capable system by simply
	  loading your cpufreq low-level hardware driver.
	  Be aware that not all cpufreq drivers support the conservative
	  governor. If unsure have a look at the help section of the
	  driver. Fallback governor will be the performance governor.

config CPU_FREQ_DEFAULT_GOV_INTERACTIVE
	bool "interactive"
	select CPU_FREQ_GOV_INTERACTIVE
	help
	  Use the CPUFreq governor 'interactive' as default. This allows
	  you to get a full dynamic cpu frequency capable system by simply
	  loading your cpufreq low-level hardware driver, using the
	  'interactive' governor for latency-sensitive workloads.

config CPU_FREQ_DEFAULT_GOV_ADAPTIVE
	bool "adaptive"
	select CPU_FREQ_GOV_ADAPTIVE
	help
	  Use the CPUFreq governor 'adaptive' as default. This allows
	  you to get a full dynamic cpu frequency capable system by simply
	  loading your cpufreq low-level hardware driver, using the
	  'adaptive' governor for latency-sensitive workloads and demanding
	  performance.

config CPU_FREQ_DEFAULT_GOV_PEGASUSQ
	bool "pegasusq"
	select CPU_FREQ_GOV_PEGASUSQ

endchoice

config CPU_FREQ_GOV_PERFORMANCE
	tristate "'performance' governor"
	help
	  This cpufreq governor sets the frequency statically to the
	  highest available CPU frequency.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_performance.

	  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.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_powersave.

	  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 a userspace program shall
	  be able to set the CPU dynamically, like on LART 
	  <http://www.lartmaker.nl/>.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_userspace.

	  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"
	select CPU_FREQ_TABLE
	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). 

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_ondemand.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

config CPU_FREQ_GOV_ONDEMAND_FLEXRATE
	bool "flexrate interface for 'ondemand' cpufreq policy governor"
	depends on CPU_FREQ_GOV_ONDEMAND
	help
	  Flexrate for 'ondemand' governor provides an interface to request
	  faster polling temporarily. This is to let it react quickly to
	  load changes when there is high probablity of load increase
	  in short time. For example, when a user event occurs, we have
	  use this interface. It does not increase the frequency
	  unconditionally; however, it allows ondemand to react fast
	  by temporarily decreasing sampling rate. Flexrate provides both
	  sysfs interface and in-kernel interface.

config CPU_FREQ_GOV_ONDEMAND_FLEXRATE_MAX_DURATION
	int "flexrate's maximum duration of sampling rate override"
	range 5 500
	depends on CPU_FREQ_GOV_ONDEMAND_FLEXRATE
	default "100"
	help
	  The maximum number of ondemand sampling whose rate is
	  overriden by Flexrate for ondemand.

config CPU_FREQ_GOV_INTERACTIVE
	tristate "'interactive' cpufreq policy governor"
	help
	  'interactive' - This driver adds a dynamic cpufreq policy governor
	  designed for latency-sensitive workloads.

	  This governor attempts to reduce the latency of clock
	  increases so that the system is more responsive to
	  interactive workloads.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_interactive.

	  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.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_conservative.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

config CPU_FREQ_GOV_ADAPTIVE
	tristate "'adaptive' cpufreq policy governor"
	help
	  'adaptive' - This driver adds a dynamic cpufreq policy governor
	  designed for latency-sensitive workloads and also for demanding
	  performance.

	  This governor attempts to reduce the latency of clock
	  increases so that the system is more responsive to
	  interactive workloads in loweset steady-state but to
	  to reduce power consumption in middle operation level level up
	  will be done in step by step to prohibit system from going to
	  max operation level.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_adaptive.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

config CPU_FREQ_GOV_PEGASUSQ
	tristate "'pegasusq' cpufreq policy governor"

config CPU_FREQ_GOV_SLP
	tristate "'slp' cpufreq policy governor"

config SLP_CHECK_CPU_LOAD
        bool "check load and frequency of cpu"
	depends on CPU_FREQ_GOV_SLP

config SLP_GOV_DYNAMIC_PARAMS
        bool "check SLP GOV. Dynamic Params feature"
	depends on CPU_FREQ_GOV_SLP

config CPU_FREQ_DVFS_MONITOR
	bool "dvfs monitor"
	depends on CPU_FREQ
	help
	  This option adds a proc node for dvfs monitoring.
	  /proc/dvfs_mon


menu "x86 CPU frequency scaling drivers"
depends on X86
source "drivers/cpufreq/Kconfig.x86"
endmenu

endif
endmenu