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authorEric Wong <e@80x24.org>2019-01-06 11:21:03 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2019-01-22 21:05:32 +0300
commit2a4daadd4d3e507138f8937926e6a4df49c6bfdc (patch)
tree193d635afae3daf8a48dbc9eba3639e8cf6a9a9d /drivers/rtc/rtc-mc146818-lib.c
parent9a20b5e35a536d6bb4b2d4a3b14a0457e205356c (diff)
downloadlinux-2a4daadd4d3e507138f8937926e6a4df49c6bfdc.tar.xz
rtc: cmos: ignore bogus century byte
Older versions of Libreboot and Coreboot had an invalid value (`3' in my case) in the century byte affecting the GM45 in the Thinkpad X200. Not everybody's updated their firmwares, and Linux <= 4.2 was able to read the RTC without problems, so workaround this by ignoring invalid values. Fixes: 3c217e51d8a272b9 ("rtc: cmos: century support") Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Sylvain Chouleur <sylvain.chouleur@intel.com> Cc: Patrick McDermott <patrick.mcdermott@libiquity.com> Cc: linux-rtc@vger.kernel.org Signed-off-by: Eric Wong <e@80x24.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-mc146818-lib.c')
-rw-r--r--drivers/rtc/rtc-mc146818-lib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-mc146818-lib.c b/drivers/rtc/rtc-mc146818-lib.c
index 2f1772a358ca..18a6f15e313d 100644
--- a/drivers/rtc/rtc-mc146818-lib.c
+++ b/drivers/rtc/rtc-mc146818-lib.c
@@ -82,7 +82,7 @@ unsigned int mc146818_get_time(struct rtc_time *time)
time->tm_year += real_year - 72;
#endif
- if (century)
+ if (century > 20)
time->tm_year += (century - 19) * 100;
/*