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rtc: spear: fix spear_rtc_read_time

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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 <alexandre.belloni@bootlin.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20220309162301.61679-21-alexandre.belloni@bootlin.com
This commit is contained in:
Alexandre Belloni
2022-03-09 17:22:52 +01:00
parent 343597e29e
commit a87a07a111
1 changed files with 4 additions and 2 deletions
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drivers/rtc/rtc-spear.c
+4 -2
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@@ -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;