Commit 7287be1d authored Jan 10, 2012 by Yauhen Kharuzhy Committed by Linus Torvalds Jan 10, 2012

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 <jekhor@gmail.com>
Cc: Daniel Mack <daniel@caiaq.de>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b43c1ea4

drivers/rtc/rtc-mxc.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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);