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authorAlexandre Courbot <acourbot@nvidia.com>2014-02-12 11:43:44 +0900
committerStephen Warren <swarren@nvidia.com>2014-02-18 13:46:50 -0700
commit338f2aadca7ed4e30e5937fdebc3ff72fda210b6 (patch)
tree54e4abec04b0da3250d8055ee7a8c68a93f0a755 /arch/arm/mach-tegra
parentb77b6e885c592815f272d70749fb8d391038f97a (diff)
ARM: tegra: cpuidle: use firmware for power down
Attempt to invoke the prepare_idle() and do_idle() firmware calls to power down a CPU so an underlying firmware gets informed of the idle operation and performs it by itself if designed in such a way. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/cpuidle-tegra114.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/cpuidle-tegra114.c b/arch/arm/mach-tegra/cpuidle-tegra114.c
index e0b87300243d..b5fb7c110c64 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra114.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra114.c
@@ -19,6 +19,7 @@
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/clockchips.h>
+#include <asm/firmware.h>
#include <asm/cpuidle.h>
#include <asm/suspend.h>
@@ -45,7 +46,11 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
- cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
+ call_firmware_op(prepare_idle);
+
+ /* Do suspend by ourselves if the firmware does not implement it */
+ if (call_firmware_op(do_idle) == -ENOSYS)
+ cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);