LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
* [PATCH] rtc: rtc-s3c: Fix failed first read of RTC time
@ 2015-04-02 11:00 Krzysztof Kozlowski
  2015-04-02 23:58 ` Chanwoo Choi
  0 siblings, 1 reply; 2+ messages in thread
From: Krzysztof Kozlowski @ 2015-04-02 11:00 UTC (permalink / raw)
  To: Alessandro Zummo, rtc-linux, linux-kernel, linux-samsung-soc,
	Alexandre Belloni
  Cc: Marek Szyprowski, Krzysztof Kozlowski

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@samsung.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


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] rtc: rtc-s3c: Fix failed first read of RTC time
  2015-04-02 11:00 [PATCH] rtc: rtc-s3c: Fix failed first read of RTC time Krzysztof Kozlowski
@ 2015-04-02 23:58 ` Chanwoo Choi
  0 siblings, 0 replies; 2+ messages in thread
From: Chanwoo Choi @ 2015-04-02 23:58 UTC (permalink / raw)
  To: Krzysztof Kozlowski
  Cc: Alessandro Zummo, rtc-linux, linux-kernel, linux-samsung-soc,
	Alexandre Belloni, Marek Szyprowski

On 04/02/2015 08:00 PM, Krzysztof Kozlowski wrote:
> 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@samsung.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);
>  
> 

When registering RTC device by using devm_rtc_device_register(),
rtc_device_register() read the time as following. Looks good to me.

	devm_rtc_device_register()
	  rtc_device_register()
	    __rtc_read_alarm()
	      rtc_read_time()
	        __rtc_read_time()

Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>

Thanks,
Chanwoo Choi


^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2015-04-02 23:58 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-04-02 11:00 [PATCH] rtc: rtc-s3c: Fix failed first read of RTC time Krzysztof Kozlowski
2015-04-02 23:58 ` Chanwoo Choi

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).