menuconfig PM_DEVFREQ
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bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
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select SRCU
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help
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A device may have a list of frequencies and voltages available.
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devfreq, a generic DVFS framework can be registered for a device
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in order to let the governor provided to devfreq choose an
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operating frequency based on the device driver's policy.
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Each device may have its own governor and policy. Devfreq can
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reevaluate the device state periodically and/or based on the
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notification to "nb", a notifier block, of devfreq.
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Like some CPUs with CPUfreq, a device may have multiple clocks.
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However, because the clock frequencies of a single device are
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determined by the single device's state, an instance of devfreq
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is attached to a single device and returns a "representative"
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clock frequency of the device, which is also attached
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to a device by 1-to-1. The device registering devfreq takes the
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responsibility to "interpret" the representative frequency and
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to set its every clock accordingly with the "target" callback
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given to devfreq.
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When OPP is used with the devfreq device, it is recommended to
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register devfreq's nb to the OPP's notifier head. If OPP is
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used with the devfreq device, you may use OPP helper
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functions defined in devfreq.h.
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if PM_DEVFREQ
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comment "DEVFREQ Governors"
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config DEVFREQ_GOV_SIMPLE_ONDEMAND
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tristate "Simple Ondemand"
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help
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Chooses frequency based on the recent load on the device. Works
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similar as ONDEMAND governor of CPUFREQ does. A device with
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Simple-Ondemand should be able to provide busy/total counter
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values that imply the usage rate. A device may provide tuned
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values to the governor with data field at devfreq_add_device().
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config DEVFREQ_GOV_PERFORMANCE
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tristate "Performance"
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help
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Sets the frequency at the maximum available frequency.
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This governor always returns UINT_MAX as frequency so that
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the DEVFREQ framework returns the highest frequency available
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at any time.
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config DEVFREQ_GOV_POWERSAVE
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tristate "Powersave"
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help
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Sets the frequency at the minimum available frequency.
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This governor always returns 0 as frequency so that
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the DEVFREQ framework returns the lowest frequency available
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at any time.
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config DEVFREQ_GOV_USERSPACE
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tristate "Userspace"
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help
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Sets the frequency at the user specified one.
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This governor returns the user configured frequency if there
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has been an input to /sys/devices/.../power/devfreq_set_freq.
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Otherwise, the governor does not change the frequency
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given at the initialization.
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config DEVFREQ_GOV_PASSIVE
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tristate "Passive"
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help
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Sets the frequency based on the frequency of its parent devfreq
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device. This governor does not change the frequency by itself
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through sysfs entries. The passive governor recommends that
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devfreq device uses the OPP table to get the frequency/voltage.
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config DEVFREQ_GOV_ADAPTIVE
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depends on ARCH_SUN50I || ARCH_SUN8IW10 || ARCH_SUN8IW11
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tristate "Adaptive"
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help
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Sets the frequency according to dram master access or idle.
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config DEVFREQ_GOV_TEMPTRIGGER
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depends on SUN50IW1P1_THERMAL
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tristate "Temptrigger"
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help
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Sets the frequency according to temperature control.
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config DEVFREQ_GOV_DSM
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depends on EVB_PLATFORM
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depends on ARCH_SUN9IW1P1 || ARCH_SUN8IW5P1 || ARCH_SUN8IW6P1 || ARCH_SUN8IW8P1 || ARCH_SUN8IW9P1
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bool "Dsm"
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help
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Sets the frequency according to dram scene management(DSM).
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comment "DEVFREQ Drivers"
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config ARM_EXYNOS_BUS_DEVFREQ
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tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
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depends on ARCH_EXYNOS || COMPILE_TEST
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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select DEVFREQ_GOV_PASSIVE
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select DEVFREQ_EVENT_EXYNOS_PPMU
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select PM_DEVFREQ_EVENT
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select PM_OPP
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help
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This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
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Memory bus has one more group of memory bus (e.g, MIF and INT block).
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Each memory bus group could contain many memoby bus block. It reads
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PPMU counters of memory controllers by using DEVFREQ-event device
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and adjusts the operating frequencies and voltages with OPP support.
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This does not yet operate with optimal voltages.
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config ARM_TEGRA_DEVFREQ
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tristate "Tegra DEVFREQ Driver"
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depends on ARCH_TEGRA_124_SOC
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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select PM_OPP
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help
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This adds the DEVFREQ driver for the Tegra family of SoCs.
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It reads ACTMON counters of memory controllers and adjusts the
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operating frequencies and voltages with OPP support.
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config ARM_RK3399_DMC_DEVFREQ
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tristate "ARM RK3399 DMC DEVFREQ Driver"
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depends on ARCH_ROCKCHIP
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select DEVFREQ_EVENT_ROCKCHIP_DFI
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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select PM_DEVFREQ_EVENT
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select PM_OPP
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help
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This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
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It sets the frequency for the memory controller and reads the usage counts
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from hardware.
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config ARM_SUNXI_DRAM_DEVFREQ
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bool "ARM Sunxi Dram DEVFREQ Driver"
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select ARCH_HAS_OPP
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select PM_OPP
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depends on ARCH_SUN50I || ARCH_SUN8IW10 || ARCH_SUN8IW11
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select DEVFREQ_GOV_ADAPTIVE
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help
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DRAM Frequency scaling allows you to change the clock speed of
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DRAM on the fly. This is a nice method to save power, because
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the lower the DRAM clock speed, the less power the DRAM consumes.
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If in doubt, say N.
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config DEVFREQ_DRAM_FREQ_CFS_SW
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bool "Change dram frequency in CFS mode, need extra software operation"
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depends on DEVFREQ_DRAM_FREQ
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depends on ARCH_SUN8IW6P1
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help
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This will need extra software operation after changing dram frequency in CFS mode.
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If in doubt, say N.
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config DEVFREQ_DRAM_FREQ_IN_VSYNC
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bool "Change dram frequency in display vsync"
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depends on ARM_SUNXI_DRAM_DEVFREQ
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depends on ARCH_SUN50I || ARCH_SUN8IW10 || ARCH_SUN8IW11
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depends on !EINK_PANEL_USED
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help
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This will allow dram frequency changed in display vsync.
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If in doubt, say N.
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config DEVFREQ_DRAM_FREQ
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bool "DRAM Frequency scaling"
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depends on DEVFREQ_GOV_USERSPACE || DEVFREQ_GOV_VANS || DEVFREQ_GOV_DSM
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depends on ARCH_SUN8IW6 || ARCH_SUN8IW5
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help
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DRAM Frequency scaling allows you to change the clock speed of
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DRAM on the fly. This is a nice method to save power, because
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the lower the DRAM clock speed, the less power the DRAM consumes.
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If in doubt, say N.
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config DEVFREQ_DRAM_FREQ_BUSFREQ
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bool "Change bus frequency with dram frequency changed when low-power music playing"
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depends on ARM_SUNXI_DRAM_DEVFREQ || DEVFREQ_DRAM_FREQ
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depends on ARCH_SUN50I || ARCH_SUN8IW6 || ARCH_SUN8IW5P1
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help
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This will allow bus frequency changed when low-power music playing.
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If in doubt, say N.
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config DEVFREQ_DRAM_FREQ_WITH_SOFT_NOTIFY
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bool "Use dram master notify access or idle in software"
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depends on ARM_SUNXI_DRAM_DEVFREQ
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depends on ARCH_SUN50I
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help
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This will allow dram master notify access or idle instead of hardware interrupt.
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If in doubt, say N.
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source "drivers/devfreq/event/Kconfig"
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endif # PM_DEVFREQ
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