From 7287be1d0ac8c82999b67c2a33517c6ec9cfdbe7 Mon Sep 17 00:00:00 2001 From: Yauhen Kharuzhy Date: Tue, 10 Jan 2012 15:10:32 -0800 Subject: drivers/rtc/rtc-mxc.c: fix setting time for MX1 SoC There is no way to track year in the i.MX1 RTC: Days Counter register is 9-bit wide only. Attempt to save date after 1970-01-01 plus 512 days causes endless loop in mxc_rtc_set_mmss(). Fix this by resetting year to 1970. [akpm@linux-foundation.org: use conventional comment layout] Signed-off-by: Yauhen Kharuzhy Cc: Daniel Mack Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-mxc.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers') diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c index 39e41fbdf08b..11b7b614fc8d 100644 --- a/drivers/rtc/rtc-mxc.c +++ b/drivers/rtc/rtc-mxc.c @@ -290,6 +290,17 @@ static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm) */ static int mxc_rtc_set_mmss(struct device *dev, unsigned long time) { + /* + * TTC_DAYR register is 9-bit in MX1 SoC, save time and day of year only + */ + if (cpu_is_mx1()) { + struct rtc_time tm; + + rtc_time_to_tm(time, &tm); + tm.tm_year = 70; + rtc_tm_to_time(&tm, &time); + } + /* Avoid roll-over from reading the different registers */ do { set_alarm_or_time(dev, MXC_RTC_TIME, time); -- cgit v1.2.3