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~9833^2~5^2~340
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f104aa02b88eba92dfc9bfe377aa26cc1e94c8d0;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 62b0bc6e4983..dcc4d58069f1 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -173,7 +173,11 @@ 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;
@@ -195,7 +199,14 @@ 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 7335952ee473..e84f5b26f1dd 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -26,6 +26,9 @@
 #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",
 };