PM / Suspend: Print wall time at suspend entry and exit

Change-Id: I92f252414c013b018b9a392eae1ee039aa0e89dc
Signed-off-by: Todd Poynor <toddpoynor@google.com>

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index bef86d121eb2ca5bcba2001a447f38e90476c5b5..454568e6c8d280a59a9f2e3e0ed50c6af6f27f90 100644 (file)
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -25,6 +25,7 @@
 #include <linux/suspend.h>
 #include <linux/syscore_ops.h>
 #include <linux/ftrace.h>
+#include <linux/rtc.h>
 #include <trace/events/power.h>
 
 #include "power.h"
@@ -358,6 +359,18 @@ 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.
@@ -372,6 +385,7 @@ int pm_suspend(suspend_state_t state)
        if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
                return -EINVAL;
 
+       pm_suspend_marker("entry");
        error = enter_state(state);
        if (error) {
                suspend_stats.fail++;
@@ -379,6 +393,7 @@ int pm_suspend(suspend_state_t state)
        } else {
                suspend_stats.success++;
        }
+       pm_suspend_marker("exit");
        return error;
 }
 EXPORT_SYMBOL(pm_suspend);