From 75814f2829338a36860476da7f9e07176e35e081 Mon Sep 17 00:00:00 2001 From: Tony Prisk Date: Fri, 4 Jan 2013 15:35:48 -0800 Subject: [PATCH] drivers/rtc/rtc-vt8500.c: fix handling of data passed in struct rtc_time commit 2f90b68309683f2c5765a1b04ca23d71e51f1494 upstream. tm_mon is 0..11, whereas vt8500 expects 1..12 for the month field, causing invalid date errors for January, and causing the day field to roll over incorrectly. The century flag is only handled in vt8500_rtc_read_time, but not set in vt8500_rtc_set_time. This patch corrects the behaviour of the century flag. Signed-off-by: Edgar Toernig Signed-off-by: Tony Prisk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Ben Hutchings --- drivers/rtc/rtc-vt8500.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/rtc/rtc-vt8500.c b/drivers/rtc/rtc-vt8500.c index 9459ee2a07ea..f818daef685a 100644 --- a/drivers/rtc/rtc-vt8500.c +++ b/drivers/rtc/rtc-vt8500.c @@ -118,7 +118,7 @@ static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm) tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S); tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S); tm->tm_mday = bcd2bin(date & DATE_DAY_MASK); - tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S); + tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S) - 1; tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S) + ((date >> DATE_CENTURY_S) & 1 ? 200 : 100); tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S; @@ -137,8 +137,9 @@ static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm) } writel((bin2bcd(tm->tm_year - 100) << DATE_YEAR_S) - | (bin2bcd(tm->tm_mon) << DATE_MONTH_S) - | (bin2bcd(tm->tm_mday)), + | (bin2bcd(tm->tm_mon + 1) << DATE_MONTH_S) + | (bin2bcd(tm->tm_mday)) + | ((tm->tm_year >= 200) << DATE_CENTURY_S), vt8500_rtc->regbase + VT8500_RTC_DS); writel((bin2bcd(tm->tm_wday) << TIME_DOW_S) | (bin2bcd(tm->tm_hour) << TIME_HOUR_S) -- 2.39.5