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 <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Sylvain Chouleur <[email protected]>
Cc: Patrick McDermott <[email protected]>
Cc: [email protected]
Signed-off-by: Eric Wong <[email protected]>
Signed-off-by: Alexandre Belloni <[email protected]>

0 files changed, 0 insertions, 0 deletions