Permits power state and battery life diagnosis.
Since one is not guaranteed to have a persistent hardware clock to
report Suspended for in milliseconds, we report at a higher level
at just the entry and exit points for suspend and hibernate.
Feature activated by CONFIG_RTC_SHOW_TIME_*
Signed-off-by: Mark Salyzyn <salyzyn@xxxxxxxxxxx>
v2:
- merge suspend and hibernate into a single patch
---
kernel/power/hibernate.c | 4 +++-
kernel/power/suspend.c | 3 +++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index e1914c7b85b1..0b5460f9189b 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -32,11 +32,11 @@
#include <linux/ctype.h>
#include <linux/genhd.h>
#include <linux/ktime.h>
+#include <linux/rtc.h>
#include <trace/events/power.h>
#include "power.h"
-
static int nocompress;
static int noresume;
static int nohibernate;
@@ -342,6 +342,7 @@ int hibernation_snapshot(int platform_mode)
pm_message_t msg;
int error;
+ rtc_show_time("PM: hibernation entry");
pm_suspend_clear_flags();
error = platform_begin(platform_mode);
if (error)
@@ -409,6 +410,7 @@ int hibernation_snapshot(int platform_mode)
thaw_kernel_threads();
Cleanup:
swsusp_free();
+ rtc_show_time("PM: hibernation exit");
goto Close;
}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 3ecf275d7e44..f44d2152ab3f 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -26,6 +26,7 @@
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/ftrace.h>
+#include <linux/rtc.h>
#include <trace/events/power.h>
#include <linux/compiler.h>
#include <linux/moduleparam.h>
@@ -579,6 +580,7 @@ int pm_suspend(suspend_state_t state)
if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
return -EINVAL;
+ rtc_show_time("PM: suspend entry");
error = enter_state(state);
if (error) {
suspend_stats.fail++;
@@ -586,6 +588,7 @@ int pm_suspend(suspend_state_t state)
} else {
suspend_stats.success++;
}
+ rtc_show_time("PM: suspend exit");
return error;
}
EXPORT_SYMBOL(pm_suspend);
--
2.14.0.rc0.284.gd933b75aa4-goog
