[AVR32] Put cpu in sleep 0 when idle.

This patch puts the CPU in sleep 0 when doing nothing, idle. This will
turn of the CPU clock and thus save power. The CPU is waken again when
an interrupt occurs.

Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 0b4325946a41..4f8d2d474740 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -19,6 +19,8 @@
 void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
+extern void cpu_idle_sleep(void);
+
 /*
  * This file handles the architecture-dependent parts of process handling..
  */
@@ -27,9 +29,8 @@ void cpu_idle(void)
 {
         /* endless idle loop with no priority at all */
         while (1) {
-                /* TODO: Enter sleep mode */
                 while (!need_resched())
-                        cpu_relax();
+                        cpu_idle_sleep();
                 preempt_enable_no_resched();
                 schedule();
                 preempt_disable();