cpu_pm: call notifiers during suspend

Implements syscore_ops in cpu_pm to call the cpu and cpu cluster notifiers during suspend and resume, allowing drivers receiving the notifications to avoid implementing syscore_ops. Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org> Tested-by: Vishwanath BS <vishwanath.bs@ti.com>

cpu_pm: call notifiers during suspend
Implements syscore_ops in cpu_pm to call the cpu and cpu cluster notifiers during suspend and resume, allowing drivers receiving the notifications to avoid implementing syscore_ops. Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org> Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
Colin Cross · Santosh Shilimkar
1 parent ab10023e00
Showing 1 changed file with 33 additions and 0 deletions Side-by-side Diff
kernel/cpu_pm.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/notifier.h>
 #include <linux/spinlock.h>
+#include <linux/syscore_ops.h>
  
 static DEFINE_RWLOCK(cpu_pm_notifier_lock);
 static RAW_NOTIFIER_HEAD(cpu_pm_notifier_chain);
@@ -198,4 +199,36 @@
 	return ret;
 }
 EXPORT_SYMBOL_GPL(cpu_cluster_pm_exit);
+
+#ifdef CONFIG_PM
+static int cpu_pm_suspend(void)
+{
+	int ret;
+
+	ret = cpu_pm_enter();
+	if (ret)
+		return ret;
+
+	ret = cpu_cluster_pm_enter();
+	return ret;
+}
+
+static void cpu_pm_resume(void)
+{
+	cpu_cluster_pm_exit();
+	cpu_pm_exit();
+}
+
+static struct syscore_ops cpu_pm_syscore_ops = {
+	.suspend = cpu_pm_suspend,
+	.resume = cpu_pm_resume,
+};
+
+static int cpu_pm_init(void)
+{
+	register_syscore_ops(&cpu_pm_syscore_ops);
+	return 0;
+}
+core_initcall(cpu_pm_init);
+#endif
...	...	@@ -20,6 +20,7 @@
20	20	#include <linux/module.h>
21	21	#include <linux/notifier.h>
22	22	#include <linux/spinlock.h>
	23	+#include <linux/syscore_ops.h>
23	24
24	25	static DEFINE_RWLOCK(cpu_pm_notifier_lock);
25	26	static RAW_NOTIFIER_HEAD(cpu_pm_notifier_chain);
...	...	@@ -198,4 +199,36 @@
198	199	return ret;
199	200	}
200	201	EXPORT_SYMBOL_GPL(cpu_cluster_pm_exit);
	202	+
	203	+#ifdef CONFIG_PM
	204	+static int cpu_pm_suspend(void)
	205	+{
	206	+ int ret;
	207	+
	208	+ ret = cpu_pm_enter();
	209	+ if (ret)
	210	+ return ret;
	211	+
	212	+ ret = cpu_cluster_pm_enter();
	213	+ return ret;
	214	+}
	215	+
	216	+static void cpu_pm_resume(void)
	217	+{
	218	+ cpu_cluster_pm_exit();
	219	+ cpu_pm_exit();
	220	+}
	221	+
	222	+static struct syscore_ops cpu_pm_syscore_ops = {
	223	+ .suspend = cpu_pm_suspend,
	224	+ .resume = cpu_pm_resume,
	225	+};
	226	+
	227	+static int cpu_pm_init(void)
	228	+{
	229	+ register_syscore_ops(&cpu_pm_syscore_ops);
	230	+ return 0;
	231	+}
	232	+core_initcall(cpu_pm_init);
	233	+#endif