From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 12 Feb 2013 21:46:19 +0000 (-0800)
Subject: drivers/rtc/rtc-pl031.c: restore ST variant functionality
X-Git-Tag: v3.8~21
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3399cfb5df9594495b876d1843a7165f77366b2b;p=platform%2Fkernel%2Flinux-3.10.git

drivers/rtc/rtc-pl031.c: restore ST variant functionality

Commit e7e034e18a0a ("drivers/rtc/rtc-pl031.c: fix the missing operation
on enable") accidentally broke the ST variants of PL031.

The bit that is being poked as "clockwatch" enable bit for the ST
variants does the work of bit 0 on this variant.  Bit 0 is used for a
clock divider on the ST variants, and setting it to 1 will affect
timekeeping in a very bad way.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Mian Yousaf KAUKAB <mian.yousaf.kaukab@stericsson.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
index 10c1a34..81c5077f 100644
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -350,7 +350,9 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
 	/* Enable the clockwatch on ST Variants */
 	if (vendor->clockwatch)
 		data |= RTC_CR_CWEN;
-	writel(data | RTC_CR_EN, ldata->base + RTC_CR);
+	else
+		data |= RTC_CR_EN;
+	writel(data, ldata->base + RTC_CR);
 
 	/*
 	 * On ST PL031 variants, the RTC reset value does not provide correct