This is a note to let you know that I've just added the patch titled
drivers/rtc/rtc-pl031.c: restore ST variant functionality
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-rtc-rtc-pl031.c-restore-st-variant-functionality.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7366b52c44b46c073a4bf1285ca09ca6ce5d9b39 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date: Tue, 12 Feb 2013 13:46:19 -0800
Subject: drivers/rtc/rtc-pl031.c: restore ST variant functionality
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
commit 3399cfb5df9594495b876d1843a7165f77366b2b upstream.
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@xxxxxxxxxx>
Acked-by: Haojian Zhuang <haojian.zhuang@xxxxxxxxx>
Cc: Mian Yousaf KAUKAB <mian.yousaf.kaukab@xxxxxxxxxxxxxx>
Cc: Srinidhi Kasagar <srinidhi.kasagar@xxxxxxxxxxxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-pl031.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -344,7 +344,9 @@ static int pl031_probe(struct amba_devic
/* Enable the clockwatch on ST Variants */
if (ldata->hw_designer == AMBA_VENDOR_ST)
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
Patches currently in stable-queue which might be from linus.walleij@xxxxxxxxxx are
queue-3.4/drivers-rtc-rtc-pl031.c-restore-st-variant-functionality.patch
queue-3.4/drivers-rtc-rtc-pl031.c-fix-the-missing-operation-on-enable.patch
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