linux-kernel - Re: [PATCH] rtc-omap: Fix initialization of control register

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Message-Id: <20110727141907.53225270.akpm@linux-foundation.org>
Date:	Wed, 27 Jul 2011 14:19:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Daniel Glöckner <dg@...ix.com>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	"George G. Davis" <gdavis@...sta.com>, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc-omap: Fix initialization of control register

On Mon, 11 Jul 2011 12:57:46 +0200
Daniel Gl__ckner <dg@...ix.com> wrote:

> As the comment explains, the intention of the code is to clear the
> OMAP_RTC_CTRL_MODE_12_24 bit, but instead it only clears the
> OMAP_RTC_CTRL_SPLIT and OMAP_RTC_CTRL_AUTO_COMP bits, which should be
> kept. OMAP_RTC_CTRL_DISABLE, OMAP_RTC_CTRL_SET_32_COUNTER,
> OMAP_RTC_CTRL_TEST, and OMAP_RTC_CTRL_ROUND_30S are also better off
> being cleared.
> 
> Signed-off-by: Daniel Gl__ckner <dg@...ix.com>
> ---
>  drivers/rtc/rtc-omap.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
> index bcae8dd..7789002 100644
> --- a/drivers/rtc/rtc-omap.c
> +++ b/drivers/rtc/rtc-omap.c
> @@ -368,7 +368,7 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
>  		pr_info("%s: already running\n", pdev->name);
>  
>  	/* force to 24 hour mode */
> -	new_ctrl = reg & ~(OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP);
> +	new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP);
>  	new_ctrl |= OMAP_RTC_CTRL_STOP;
>  
>  	/* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:

Decisions need to be made about which kernel version(s) this should be
merged into.  To make and support those decisions we need to know the
user-visible effects of the bug.  But the changelog is silent on this
important thing.

What were the user-visible effects of the bug?

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