From a87a07a111443adbf69cb815187e9532319e8530 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Wed, 9 Mar 2022 17:22:52 +0100 Subject: rtc: spear: fix spear_rtc_read_time The reference manual doesn't specify whether the registers are latched and they probably aren't, ensure the read time and date are consistent. Signed-off-by: Alexandre Belloni Acked-by: Viresh Kumar Link: https://lore.kernel.org/r/20220309162301.61679-21-alexandre.belloni@bootlin.com --- drivers/rtc/rtc-spear.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-spear.c b/drivers/rtc/rtc-spear.c index c395af3ebc91..d4777b01ab22 100644 --- a/drivers/rtc/rtc-spear.c +++ b/drivers/rtc/rtc-spear.c @@ -204,8 +204,10 @@ static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm) /* we don't report wday/yday/isdst ... */ rtc_wait_not_busy(config); - time = readl(config->ioaddr + TIME_REG); - date = readl(config->ioaddr + DATE_REG); + do { + time = readl(config->ioaddr + TIME_REG); + date = readl(config->ioaddr + DATE_REG); + } while (time == readl(config->ioaddr + TIME_REG)); tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK; tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK; tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK; -- cgit v1.2.1