rtc: fix ds1388 time corruption
commit7fd17ce98fb333003ece62ab16e873062ee64d14
authorJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Tue, 29 Jun 2010 22:05:34 +0000 (29 15:05 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Mon, 2 Aug 2010 17:29:48 +0000 (2 10:29 -0700)
tree49eb2521f731023823d7f2fa0ec582faca2009d3
parentc16b1c3809898538223a78bee8a84eeb14a7b275
rtc: fix ds1388 time corruption

commit 96fc3a45ea073136566f3c2676cad52f8b39a7df upstream.

The ds1307 driver misreads the ds1388 registers when checking for 12 or 24
hour mode.  Instead of checking the hour register it reads the minute
register.  Therefore the driver thinks minutes >= 40 has the 12HR bit set
and resets the minute register by zeroing the high bits.  This results in
minutes are reset to 0-9, jumping back in time 40 or 50 minutes.  The time
jump is also written back to the RTC.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/rtc/rtc-ds1307.c