From: Arve Hjønnevåg <arve@android.com>
Date: Fri, 10 Oct 2008 02:17:11 +0000 (-0700)
Subject: PM: Enable early suspend through /sys/power/state
X-Git-Tag: firefly_0821_release~11764
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=5f36bdf15970bf5ef97dce533ddac32d85191d6b;p=firefly-linux-kernel-4.4.55.git

PM: Enable early suspend through /sys/power/state

If EARLYSUSPEND is enabled then writes to /sys/power/state no longer
blocks, and the kernel will try to enter the requested state every
time no wakelocks are held. Write "on" to resume normal operation.
---

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 347d2cc88cd0..77a3584d253f 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -147,7 +147,11 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 			   const char *buf, size_t n)
 {
 #ifdef CONFIG_SUSPEND
+#ifdef CONFIG_EARLYSUSPEND
+	suspend_state_t state = PM_SUSPEND_ON;
+#else
 	suspend_state_t state = PM_SUSPEND_STANDBY;
+#endif
 	const char * const *s;
 #endif
 	char *p;
@@ -169,7 +173,14 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 			break;
 	}
 	if (state < PM_SUSPEND_MAX && *s)
+#ifdef CONFIG_EARLYSUSPEND
+		if (state == PM_SUSPEND_ON || valid_state(state)) {
+			error = 0;
+			request_suspend_state(state);
+		}
+#else
 		error = enter_state(state);
+#endif
 #endif
 
  Exit:
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 6f10dfc2d3e9..cd515ba1c8ce 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -19,6 +19,9 @@
 #include "power.h"
 
 const char *const pm_states[PM_SUSPEND_MAX] = {
+#ifdef CONFIG_EARLYSUSPEND
+	[PM_SUSPEND_ON]		= "on",
+#endif
 	[PM_SUSPEND_STANDBY]	= "standby",
 	[PM_SUSPEND_MEM]	= "mem",
 };