power: avs: Add support for CPR (Core Power Reduction) (bf6910ab) · Commits · 戴 / test

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:

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>

MAINTAINERS

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Original line number	Diff line number	Diff line
		@@ -13667,6 +13667,14 @@ S: Maintained
		F: Documentation/devicetree/bindings/opp/qcom-nvmem-cpufreq.txt
		F: drivers/cpufreq/qcom-cpufreq-nvmem.c

		QUALCOMM CORE POWER REDUCTION (CPR) AVS DRIVER
		M: Niklas Cassel <nks@flawful.org>
		L: linux-pm@vger.kernel.org
		L: linux-arm-msm@vger.kernel.org
		S: Maintained
		F: Documentation/devicetree/bindings/power/avs/qcom,cpr.txt
		F: drivers/power/avs/qcom-cpr.c

		QUALCOMM EMAC GIGABIT ETHERNET DRIVER
		M: Timur Tabi <timur@kernel.org>
		L: netdev@vger.kernel.org

drivers/power/avs/Kconfig

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Original line number	Diff line number	Diff line
		@@ -12,6 +12,21 @@ menuconfig POWER_AVS

		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

drivers/power/avs/Makefile

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		# SPDX-License-Identifier: GPL-2.0-only
		obj-$(CONFIG_POWER_AVS_OMAP) += smartreflex.o
		obj-$(CONFIG_QCOM_CPR) += qcom-cpr.o
		obj-$(CONFIG_ROCKCHIP_IODOMAIN) += rockchip-io-domain.o

drivers/power/avs/qcom-cpr.c

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