summaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/cpuidle.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kernel/cpuidle.c')
-rw-r--r--arch/arm64/kernel/cpuidle.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index 19d17f51db37..5c0896647fd1 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -29,3 +29,23 @@ int cpu_init_idle(unsigned int cpu)
of_node_put(cpu_node);
return ret;
}
+
+/**
+ * cpu_suspend() - function to enter a low-power idle state
+ * @arg: argument to pass to CPU suspend operations
+ *
+ * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
+ * operations back-end error code otherwise.
+ */
+int cpu_suspend(unsigned long arg)
+{
+ int cpu = smp_processor_id();
+
+ /*
+ * If cpu_ops have not been registered or suspend
+ * has not been initialized, cpu_suspend call fails early.
+ */
+ if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_suspend)
+ return -EOPNOTSUPP;
+ return cpu_ops[cpu]->cpu_suspend(arg);
+}