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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 <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
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@ -204,8 +204,10 @@ static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm)
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/* we don't report wday/yday/isdst ... */
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rtc_wait_not_busy(config);
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time = readl(config->ioaddr + TIME_REG);
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date = readl(config->ioaddr + DATE_REG);
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do {
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time = readl(config->ioaddr + TIME_REG);
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date = readl(config->ioaddr + DATE_REG);
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} while (time == readl(config->ioaddr + TIME_REG));
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tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
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tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
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tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
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