From 9386021e470c8a433aacceef0cadf1238747623d Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Sun, 6 Jan 2019 08:21:03 +0000 Subject: [PATCH] rtc: cmos: ignore bogus century byte [ Upstream commit 2a4daadd4d3e507138f8937926e6a4df49c6bfdc ] 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 Cc: Alessandro Zummo Cc: Sylvain Chouleur Cc: Patrick McDermott Cc: linux-rtc@vger.kernel.org Signed-off-by: Eric Wong Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- include/asm-generic/rtc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h index 4e3b65583..3e457ae2d 100644 --- a/include/asm-generic/rtc.h +++ b/include/asm-generic/rtc.h @@ -106,7 +106,7 @@ static inline unsigned int __get_rtc_time(struct rtc_time *time) time->tm_year += real_year - 72; #endif - if (century) + if (century > 20) time->tm_year += (century - 19) * 100; /*