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ARM: tegra: cpuidle: implement cpuidle_state.enter_freeze()

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This callback is expected to do the same as enter() but it has to
guarantee that interrupts aren't enabled at any point in its execution,
as the tick is frozen.

It will be called when the system goes to suspend-to-idle and will
reduce power usage because CPUs won't be awaken for unnecessary IRQs.

By setting the CPUIDLE_FLAG_TIMER_STOP flag, we can reuse the same code
for both the enter() and enter_freeze() callbacks.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Tomeu Vizoso 2015-05-19 16:49:12 +02:00 committed by Thierry Reding
parent fc0cf17734
commit 1ec0e115f8
1 changed files with 9 additions and 4 deletions
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13
arch/arm/mach-tegra/cpuidle-tegra114.c
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@ -45,16 +45,12 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
tegra_set_cpu_in_lp2();
cpu_pm_enter();
tick_broadcast_enter();
call_firmware_op(prepare_idle);
/* Do suspend by ourselves if the firmware does not implement it */
if (call_firmware_op(do_idle, 0) == -ENOSYS)
cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
tick_broadcast_exit();
cpu_pm_exit();
tegra_clear_cpu_in_lp2();
@ -62,6 +58,13 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
return index;
}
static void tegra114_idle_enter_freeze(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
tegra114_idle_power_down(dev, drv, index);
}
#endif
static struct cpuidle_driver tegra_idle_driver = {
@ -73,8 +76,10 @@ static struct cpuidle_driver tegra_idle_driver = {
#ifdef CONFIG_PM_SLEEP
[1] = {
.enter = tegra114_idle_power_down,
.enter_freeze = tegra114_idle_enter_freeze,
.exit_latency = 500,
.target_residency = 1000,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.power_usage = 0,
.name = "powered-down",
.desc = "CPU power gated",