diff options
Diffstat (limited to 'patches/02_rtc-cmos-ignore-bogus-century-byte.patch')
| -rw-r--r-- | patches/02_rtc-cmos-ignore-bogus-century-byte.patch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/patches/02_rtc-cmos-ignore-bogus-century-byte.patch b/patches/02_rtc-cmos-ignore-bogus-century-byte.patch new file mode 100644 index 0000000..904d61f --- /dev/null +++ b/patches/02_rtc-cmos-ignore-bogus-century-byte.patch @@ -0,0 +1,37 @@ +From 2a4daadd4d3e507138f8937926e6a4df49c6bfdc Mon Sep 17 00:00:00 2001 +From: Eric Wong <e@80x24.org> +Date: Sun, 6 Jan 2019 08:21:03 +0000 +Subject: 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> +--- + drivers/rtc/rtc-mc146818-lib.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +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; + + /* |