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

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Commit e7e034e18a ("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>
This commit is contained in:
Linus Walleij 2013-02-12 13:46:19 -08:00 • committed by Linus Torvalds
parent 211b0cdc7d
commit 3399cfb5df
1 changed files with 3 additions and 1 deletions
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4
drivers/rtc/rtc-pl031.c
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@ -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