Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4c5a4d47 authored by Stephen Boyd's avatar Stephen Boyd Committed by Maulik Shah
Browse files

drivers: cpuidle: lpm-levels: Support s2idle 



If we support suspend-to-idle we can avoid the overhead in
hotplugging out CPUs and tearing things down during suspend. Most
things are already in place to support this so we can pretty much
re-use the platform suspend ops to enter the s2idle state for
suspending with cpuidle.

Change-Id: Ib062d93a0c122a644af4a729dbb202b88c9a6c56
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarMaulik Shah <mkshah@codeaurora.org>
parent 7619541d

drivers/cpuidle/lpm-levels.c

+32 −0
Original line number Diff line number Diff line
@@ -1387,6 +1387,30 @@ static int lpm_cpuidle_enter(struct cpuidle_device *dev, 
	return idx;

}



static void lpm_cpuidle_s2idle(struct cpuidle_device *dev,

		struct cpuidle_driver *drv, int idx)

{

	struct lpm_cpu *cpu = per_cpu(cpu_lpm, dev->cpu);

	const struct cpumask *cpumask = get_cpu_mask(dev->cpu);



	for (; idx >= 0; idx--) {

		if (lpm_cpu_mode_allow(dev->cpu, idx, false))

			break;

	}

	if (idx < 0) {

		pr_err("Failed suspend\n");

		return;

	}



	cpu_prepare(cpu, idx, true);

	cluster_prepare(cpu->parent, cpumask, idx, false, 0);



	psci_enter_sleep(cpu, idx, false);



	cluster_unprepare(cpu->parent, cpumask, idx, false, 0);

	cpu_unprepare(cpu, idx, true);

}



#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS

static int cpuidle_register_cpu(struct cpuidle_driver *drv,

		struct cpumask *mask)
@@ -1473,6 +1497,8 @@ static int cluster_cpuidle_register(struct lpm_cluster *cl) 
			st->power_usage = cpu_level->pwr.ss_power;

			st->target_residency = 0;

			st->enter = lpm_cpuidle_enter;

			if (i == lpm_cpu->nlevels - 1)

				st->enter_s2idle = lpm_cpuidle_s2idle;

		}



		lpm_cpu->drv->state_count = lpm_cpu->nlevels;
@@ -1628,6 +1654,11 @@ static const struct platform_suspend_ops lpm_suspend_ops = { 
	.wake = lpm_suspend_wake,

};



static const struct platform_s2idle_ops lpm_s2idle_ops = {

	.prepare = lpm_suspend_prepare,

	.restore = lpm_suspend_wake,

};



static int lpm_probe(struct platform_device *pdev)

{

	int ret;
@@ -1656,6 +1687,7 @@ static int lpm_probe(struct platform_device *pdev) 
	 * how late lpm_levels gets initialized.

	 */

	suspend_set_ops(&lpm_suspend_ops);

	s2idle_set_ops(&lpm_s2idle_ops);

	hrtimer_init(&lpm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);

	for_each_possible_cpu(cpu) {

		cpu_histtimer = &per_cpu(histtimer, cpu);