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Commit d2e5c871 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Daniel Lezcano
Browse files

drivers: cpuidle: initialize big.LITTLE driver through DT 



With the introduction of DT based idle states, CPUidle drivers for ARM
can now initialize idle states data through properties in the device tree.

This patch adds code to the big.LITTLE CPUidle driver to dynamically
initialize idle states data through the updated device tree source file.

Cc: Chander Kashyap <k.chander@samsung.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent 3299b63d

arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts

+23 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
			compatible = "arm,cortex-a15";

			reg = <0>;

			cci-control-port = <&cci_control1>;

			cpu-idle-states = <&CLUSTER_SLEEP_BIG>;

		};



		cpu1: cpu@1 {
@@ -45,6 +46,7 @@ 
			compatible = "arm,cortex-a15";

			reg = <1>;

			cci-control-port = <&cci_control1>;

			cpu-idle-states = <&CLUSTER_SLEEP_BIG>;

		};



		cpu2: cpu@2 {
@@ -52,6 +54,7 @@ 
			compatible = "arm,cortex-a7";

			reg = <0x100>;

			cci-control-port = <&cci_control2>;

			cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;

		};



		cpu3: cpu@3 {
@@ -59,6 +62,7 @@ 
			compatible = "arm,cortex-a7";

			reg = <0x101>;

			cci-control-port = <&cci_control2>;

			cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;

		};



		cpu4: cpu@4 {
@@ -66,6 +70,25 @@ 
			compatible = "arm,cortex-a7";

			reg = <0x102>;

			cci-control-port = <&cci_control2>;

			cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;

		};



		idle-states {

			CLUSTER_SLEEP_BIG: cluster-sleep-big {

				compatible = "arm,idle-state";

				local-timer-stop;

				entry-latency-us = <1000>;

				exit-latency-us = <700>;

				min-residency-us = <2000>;

			};



			CLUSTER_SLEEP_LITTLE: cluster-sleep-little {

				compatible = "arm,idle-state";

				local-timer-stop;

				entry-latency-us = <1000>;

				exit-latency-us = <500>;

				min-residency-us = <2500>;

			};

		};

	};

drivers/cpuidle/Kconfig.arm

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ config ARM_BIG_LITTLE_CPUIDLE 
	depends on MCPM

	select ARM_CPU_SUSPEND

	select CPU_IDLE_MULTIPLE_DRIVERS

	select DT_IDLE_STATES

	help

	  Select this option to enable CPU idle driver for big.LITTLE based

	  ARM systems. Driver manages CPUs coordination through MCPM and

drivers/cpuidle/cpuidle-big_little.c

+19 −0
Original line number Diff line number Diff line
@@ -24,6 +24,8 @@ 
#include <asm/smp_plat.h>

#include <asm/suspend.h>



#include "dt_idle_states.h"



static int bl_enter_powerdown(struct cpuidle_device *dev,

			      struct cpuidle_driver *drv, int idx);
@@ -73,6 +75,12 @@ static struct cpuidle_driver bl_idle_little_driver = { 
	.state_count = 2,

};



static const struct of_device_id bl_idle_state_match[] __initconst = {

	{ .compatible = "arm,idle-state",

	  .data = bl_enter_powerdown },

	{ },

};



static struct cpuidle_driver bl_idle_big_driver = {

	.name = "big_idle",

	.owner = THIS_MODULE,
@@ -191,6 +199,17 @@ static int __init bl_idle_init(void) 
	if (ret)

		goto out_uninit_little;



	/* Start at index 1, index 0 standard WFI */

	ret = dt_init_idle_driver(&bl_idle_big_driver, bl_idle_state_match, 1);

	if (ret < 0)

		goto out_uninit_big;



	/* Start at index 1, index 0 standard WFI */

	ret = dt_init_idle_driver(&bl_idle_little_driver,

				  bl_idle_state_match, 1);

	if (ret < 0)

		goto out_uninit_big;



	ret = cpuidle_register(&bl_idle_little_driver, NULL);

	if (ret)

		goto out_uninit_big;