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rtc: at91rm9200: fix reading alarm value 

When alarm value is read at boot time, at91_alarm_year is not yet set to
the proper value so the year is always set to 1900.

This results in that kind of message at boot:
rtc rtc0: invalid alarm value: 1900-1-14 2:11:39

There is no way to recover from that as the alarm is now only read when
booting.

Instead, rely on the rtc core to figure out the proper year.

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
zero-colors
Alexandre Belloni 2017-11-10 09:59:31 +01:00
parent 275ebe2b8f
commit eaa1dc7ba1
1 changed files with 6 additions and 12 deletions
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18
drivers/rtc/rtc-at91rm9200.c
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@ -42,8 +42,6 @@
#define at91_rtc_write(field, val) \
writel_relaxed((val), at91_rtc_regs + field)
#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
struct at91_rtc_config {
bool use_shadow_imr;
};
@ -51,7 +49,6 @@ struct at91_rtc_config {
static const struct at91_rtc_config *at91_rtc_config;
static DECLARE_COMPLETION(at91_rtc_updated);
static DECLARE_COMPLETION(at91_rtc_upd_rdy);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;
static DEFINE_SPINLOCK(at91_rtc_lock);
@ -131,8 +128,7 @@ static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
/*
* The Calendar Alarm register does not have a field for
* the year - so these will return an invalid value. When an
* alarm is set, at91_alarm_year will store the current year.
* the year - so these will return an invalid value.
*/
tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */
@ -208,14 +204,14 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
struct rtc_time *tm = &alrm->time;
at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
tm->tm_year = at91_alarm_year - 1900;
tm->tm_year = -1;
alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM)
? 1 : 0;
dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
dev_dbg(dev, "%s(): %02d-%02d %02d:%02d:%02d %sabled\n", __func__,
tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec,
alrm->enabled ? "en" : "dis");
return 0;
}
@ -229,8 +225,6 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
at91_alarm_year = tm.tm_year;
tm.tm_mon = alrm->time.tm_mon;
tm.tm_mday = alrm->time.tm_mday;
tm.tm_hour = alrm->time.tm_hour;
@ -254,7 +248,7 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
}
dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
tm.tm_min, tm.tm_sec);
return 0;