linux-kernel - [PATCH 2/3] rtc: Skip the suspend/resume handling if persistent clock exist

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Date:	Thu, 13 Dec 2012 10:05:27 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-kernel@...r.kernel.org
Cc:	alek.du@...el.com, Feng Tang <feng.tang@...el.com>,
	Arve Hjønnevåg <arve@...roid.com>
Subject: [PATCH 2/3] 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@...utronix.de>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Alessandro Zummo <a.zummo@...ertech.it>
Cc: Arve Hjønnevåg <arve@...roid.com>
Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 drivers/rtc/class.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index f8a0aab..bf4c6d3 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 (persistent_clock_exist)
+		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 (persistent_clock_exist)
+		return 0;
+
 	rtc_hctosys_ret = -ENODEV;
 	if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
 		return 0;
-- 
1.7.9.5

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