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vrtc: change its year offset from 1960 to 1972

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Real world year equals the value in vrtc YEAR register plus an offset.
We used 1960 as the offset to make leap year consistent, but for a
device's first use, its YEAR register is 0 and the system year will
be parsed as 1960 which is not a valid UNIX time and will cause many
applications to fail mysteriously. So we use 1972 instead to fix this
issue.

Updated patch which adds a sanity check suggested by Mathias

This isn't a change in behaviour for systems, because 1972 is the one we
actually use. It's the old version in upstream which is out of sync with
all devices.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Feng Tang
2011-11-10 13:23:39 +00:00
committed by Linus Torvalds
parent f2ee442115
commit 57e6319dd6
2 changed files with 13 additions and 10 deletions
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4
arch/x86/platform/mrst/vrtc.c
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@ -76,8 +76,8 @@ unsigned long vrtc_get_time(void)
spin_unlock_irqrestore(&rtc_lock, flags);
/* vRTC YEAR reg contains the offset to 1960 */
year += 1960;
/* vRTC YEAR reg contains the offset to 1972 */
year += 1972;
printk(KERN_INFO "vRTC: sec: %d min: %d hour: %d day: %d "
"mon: %d year: %d\n", sec, min, hour, mday, mon, year);