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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>
This commit is contained in:
Alexandre Courbot 2014-02-12 11:43:44 +09:00 committed by Stephen Warren
parent b77b6e885c
commit 338f2aadca
1 changed files with 6 additions and 1 deletions
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7
arch/arm/mach-tegra/cpuidle-tegra114.c
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@ -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);