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Commit 3045cb33 authored by Joseph Lo's avatar Joseph Lo Committed by Stephen Warren
Browse files

ARM: tegra114: cpuidle: add powered-down state 



This supports CPU core power down on each CPU when CPU idle. When CPU go
into this state, it saves it's context and needs a proper configuration
in flow controller to power gate the CPU when CPU runs into WFI
instruction. And the CPU also needs to set the IRQ as CPU power down idle
wake up event in flow controller.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarJoseph Lo <josephl@nvidia.com>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
parent 1b9e6b27

arch/arm/mach-tegra/cpuidle-tegra114.c

+50 −1
Original line number Diff line number Diff line
@@ -17,15 +17,64 @@ 
#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/cpuidle.h>

#include <linux/cpu_pm.h>

#include <linux/clockchips.h>



#include <asm/cpuidle.h>

#include <asm/suspend.h>

#include <asm/smp_plat.h>



#include "pm.h"

#include "sleep.h"



#ifdef CONFIG_PM_SLEEP

#define TEGRA114_MAX_STATES 2

#else

#define TEGRA114_MAX_STATES 1

#endif



#ifdef CONFIG_PM_SLEEP

static int tegra114_idle_power_down(struct cpuidle_device *dev,

				    struct cpuidle_driver *drv,

				    int index)

{

	local_fiq_disable();



	tegra_set_cpu_in_lp2();

	cpu_pm_enter();



	clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);



	cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);



	clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);



	cpu_pm_exit();

	tegra_clear_cpu_in_lp2();



	local_fiq_enable();



	return index;

}

#endif



static struct cpuidle_driver tegra_idle_driver = {

	.name = "tegra_idle",

	.owner = THIS_MODULE,

	.state_count = 1,

	.state_count = TEGRA114_MAX_STATES,

	.states = {

		[0] = ARM_CPUIDLE_WFI_STATE_PWR(600),

#ifdef CONFIG_PM_SLEEP

		[1] = {

			.enter			= tegra114_idle_power_down,

			.exit_latency		= 500,

			.target_residency	= 1000,

			.power_usage		= 0,

			.flags			= CPUIDLE_FLAG_TIME_VALID,

			.name			= "powered-down",

			.desc			= "CPU power gated",

		},

#endif

	},

};