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authorTomeu Vizoso <tomeu.vizoso@collabora.com>2015-05-19 16:49:12 +0200
committerThierry Reding <treding@nvidia.com>2015-08-13 16:53:38 +0200
commit1ec0e115f8604940491861d207cc1e1478db97b3 (patch)
tree3397eabff039b80e150d86fcf48993ffa3f08512 /arch/arm/mach-tegra
parentfc0cf1773434c153a831067a29935e4627803583 (diff)
downloadblackbird-op-linux-1ec0e115f8604940491861d207cc1e1478db97b3.tar.gz
blackbird-op-linux-1ec0e115f8604940491861d207cc1e1478db97b3.zip
ARM: tegra: cpuidle: implement cpuidle_state.enter_freeze()
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>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/cpuidle-tegra114.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/arm/mach-tegra/cpuidle-tegra114.c b/arch/arm/mach-tegra/cpuidle-tegra114.c
index bc00dd4a6fb2..9157546fe68c 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra114.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra114.c
@@ -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",
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