arm64: kernel: add CPU idle call

When CPU idle is enabled, the architectural idle call should go through
the idle subsystem to allow CPUs to enter idle states defined
by the platform CPU idle back-end operations.

This patch, mirroring other archs behaviour, adds the CPU idle call to the
architectural arch_cpu_idle implementation for arm64.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 57bd961f29176002dd911e8991d462da924e1ec6..4e1cfd0f132b167983789df149c224cca2c22227 100644 (file)
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -33,6 +33,7 @@
 #include <linux/kallsyms.h>
 #include <linux/init.h>
 #include <linux/cpu.h>
+#include <linux/cpuidle.h>
 #include <linux/elfcore.h>
 #include <linux/pm.h>
 #include <linux/tick.h>
@@ -107,8 +108,10 @@ void arch_cpu_idle(void)
         * This should do all the clock switching and wait for interrupt
         * tricks
         */
-       cpu_do_idle();
-       local_irq_enable();
+       if (cpuidle_idle_call()) {
+               cpu_do_idle();
+               local_irq_enable();
+       }
 }
 
 #ifdef CONFIG_HOTPLUG_CPU