rtc: Skip the suspend/resume handling if persistent clock exist

All the RTC suspend and resume functions are to compensate the
sleep time, but this is already done in timekeeping.c if persistent
clock exist.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index f8a0aab218cb..c01773f56435 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -50,6 +50,10 @@ static int rtc_suspend(struct device *dev, pm_message_t mesg)
         struct rtc_device       *rtc = to_rtc_device(dev);
         struct rtc_time         tm;
         struct timespec         delta, delta_delta;
+
+        if (has_persistent_clock())
+                return 0;
+
         if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
                 return 0;
 
@@ -88,6 +92,9 @@ static int rtc_resume(struct device *dev)
         struct timespec         new_system, new_rtc;
         struct timespec         sleep_time;
 
+        if (has_persistent_clock())
+                return 0;
+
         rtc_hctosys_ret = -ENODEV;
         if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
                 return 0;