diff options
| author | Scott Williams <scwilliams@nvidia.com> | 2011-07-21 18:24:34 -0700 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:46:57 -0800 |
| commit | 3b3b17486113ac2e5af1f6d2d555f1315cb40434 (patch) | |
| tree | a5943868a0be1de16024cba4c9e310b934847171 /arch/arm/mach-tegra/cpuidle.c | |
| parent | edd6779f31582fb6acdb59f58dfb4471fa4078d6 (diff) | |
ARM: tegra: power: Save TWD registers on cluster transitions
The ARM timer/watchdog (TWD) registers do not need saving on LP2
transitions resulting from real idle events. They do still need
saving/restoring on transitions resulting from cluster control
operations.
Change-Id: I459b25b98c256a52a2e9e68fb63dbf2681e90b07
Signed-off-by: Scott Williams <scwilliams@nvidia.com>
Signed-off-by: Dan Willemsen <dwillemsen@nvidia.com>
Rebase-Id: R3c7c0cae8b847af6355fa1fa0b8bf5bf1e1efef5
Diffstat (limited to 'arch/arm/mach-tegra/cpuidle.c')
| -rw-r--r-- | arch/arm/mach-tegra/cpuidle.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/cpuidle.c b/arch/arm/mach-tegra/cpuidle.c index 820eba972a1b..73ed6d4e3a2f 100644 --- a/arch/arm/mach-tegra/cpuidle.c +++ b/arch/arm/mach-tegra/cpuidle.c @@ -135,8 +135,11 @@ static int tegra_idle_enter_lp2(struct cpuidle_device *dev, tegra_cpu_idle_stats_lp2_ready(dev->cpu); + /* Shut down the CPU local timer and switch timekeeping to the + global system timer. */ clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu); tegra_idle_lp2(dev, state); + /* Switch timekeeping back to the CPU local timer. */ clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); exit = ktime_sub(ktime_get(), enter); |