bf6910abf5
CPR (Core Power Reduction) is a technology that reduces core power on a CPU or other device. It reads voltage settings in efuse from product test process as initial settings. Each OPP corresponds to a "corner" that has a range of valid voltages for a particular frequency. While the device is running at a particular frequency, CPR monitors dynamic factors such as temperature, etc. and adjusts the voltage for that frequency accordingly to save power and meet silicon characteristic requirements. This driver is based on an RFC by Stephen Boyd[1], which in turn is based on work by others on codeaurora.org[2]. [1] https://lkml.org/lkml/2015/9/18/833 [2] https://source.codeaurora.org/quic/la/kernel/msm-4.14/tree/drivers/regulator/cpr-regulator.c?h=msm-4.14 Co-developed-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
|
|
menuconfig POWER_AVS
|
|
bool "Adaptive Voltage Scaling class support"
|
|
help
|
|
AVS is a power management technique which finely controls the
|
|
operating voltage of a device in order to optimize (i.e. reduce)
|
|
its power consumption.
|
|
At a given operating point the voltage is adapted depending on
|
|
static factors (chip manufacturing process) and dynamic factors
|
|
(temperature depending performance).
|
|
AVS is also called SmartReflex on OMAP devices.
|
|
|
|
Say Y here to enable Adaptive Voltage Scaling class support.
|
|
|
|
config QCOM_CPR
|
|
tristate "QCOM Core Power Reduction (CPR) support"
|
|
depends on POWER_AVS
|
|
select PM_OPP
|
|
help
|
|
Say Y here to enable support for the CPR hardware found on Qualcomm
|
|
SoCs like QCS404.
|
|
|
|
This driver populates CPU OPPs tables and makes adjustments to the
|
|
tables based on feedback from the CPR hardware. If you want to do
|
|
CPUfrequency scaling say Y here.
|
|
|
|
To compile this driver as a module, choose M here: the module will
|
|
be called qcom-cpr
|
|
|
|
config ROCKCHIP_IODOMAIN
|
|
tristate "Rockchip IO domain support"
|
|
depends on POWER_AVS && ARCH_ROCKCHIP && OF
|
|
help
|
|
Say y here to enable support io domains on Rockchip SoCs. It is
|
|
necessary for the io domain setting of the SoC to match the
|
|
voltage supplied by the regulators.
|