linux-kernel - [PATCH] rtc: rtc-s3c: Fix failed first read of RTC time

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Date:	Thu, 02 Apr 2015 13:00:59 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH] rtc: rtc-s3c: Fix failed first read of RTC time

Initialize the device time (if it is wrong) before registering RTC
device to fix following error message during rtc-s3c probe:

[    2.215414] rtc (null): read_time: fail to read
[    2.216322] s3c-rtc 10070000.rtc: rtc core: registered s3c as rtc1

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
---
 drivers/rtc/rtc-s3c.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 5e162eaad277..1d3a4c58fec4 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -496,6 +496,22 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 	device_init_wakeup(&pdev->dev, 1);
 
+	/* Check RTC Time */
+	s3c_rtc_gettime(&pdev->dev, &rtc_tm);
+
+	if (rtc_valid_tm(&rtc_tm)) {
+		rtc_tm.tm_year	= 100;
+		rtc_tm.tm_mon	= 0;
+		rtc_tm.tm_mday	= 1;
+		rtc_tm.tm_hour	= 0;
+		rtc_tm.tm_min	= 0;
+		rtc_tm.tm_sec	= 0;
+
+		s3c_rtc_settime(&pdev->dev, &rtc_tm);
+
+		dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
+	}
+
 	/* register RTC and exit */
 	info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
 				  THIS_MODULE);
@@ -519,22 +535,6 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 		goto err_nortc;
 	}
 
-	/* Check RTC Time */
-	s3c_rtc_gettime(&pdev->dev, &rtc_tm);
-
-	if (rtc_valid_tm(&rtc_tm)) {
-		rtc_tm.tm_year	= 100;
-		rtc_tm.tm_mon	= 0;
-		rtc_tm.tm_mday	= 1;
-		rtc_tm.tm_hour	= 0;
-		rtc_tm.tm_min	= 0;
-		rtc_tm.tm_sec	= 0;
-
-		s3c_rtc_settime(&pdev->dev, &rtc_tm);
-
-		dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
-	}
-
 	if (info->data->select_tick_clk)
 		info->data->select_tick_clk(info);
 
-- 
1.9.1

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