From 9e9542e9878e8933d40992376ab30415fbab296a Mon Sep 17 00:00:00 2001
From: Todd Poynor <toddpoynor@google.com>
Date: Tue, 29 May 2012 17:33:56 -0700
Subject: [PATCH] PM/Suspend:Print wall time at suspend entry and exit

Cherry pick this commit from defender to print "PM: suspend" with
wall time when enter and exit suspend.

Change-Id: I92f252414c013b018b9a392eae1ee039aa0e89dc
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: yangjq <yangjq@lenovo.com>
Reviewed-on: https://gerrit.mot.com/1477734
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Jialei Hao <haojl2@motorola.com>
Reviewed-by: Jianqi Yang <yangj@motorola.com>
Submit-Approved: Jira Key
Reviewed-on: https://gerrit.mot.com/1778522
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
---
 kernel/power/suspend.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 3a231ceefa94..b584c67f57ab 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -27,6 +27,7 @@
 #include <linux/syscore_ops.h>
 #include <linux/swait.h>
 #include <linux/ftrace.h>
+#include <linux/rtc.h>
 #include <trace/events/power.h>
 #include <linux/compiler.h>
 #include <linux/moduleparam.h>
@@ -608,6 +609,18 @@ static int enter_state(suspend_state_t state)
 	return error;
 }
 
+static void pm_suspend_marker(char *annotation)
+{
+	struct timespec ts;
+	struct rtc_time tm;
+
+	getnstimeofday(&ts);
+	rtc_time_to_tm(ts.tv_sec, &tm);
+	pr_info("PM: suspend %s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n",
+		annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+		tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
+}
+
 /**
  * pm_suspend - Externally visible function for suspending the system.
  * @state: System sleep state to enter.
@@ -622,6 +635,7 @@ int pm_suspend(suspend_state_t state)
 	if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
 		return -EINVAL;
 
+	pm_suspend_marker("entry");
 	pr_info("suspend entry (%s)\n", mem_sleep_labels[state]);
 	error = enter_state(state);
 	if (error) {
@@ -630,6 +644,7 @@ int pm_suspend(suspend_state_t state)
 	} else {
 		suspend_stats.success++;
 	}
+	pm_suspend_marker("exit");
 	pr_info("suspend exit\n");
 	return error;
 }