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| author | paulmn <paulmn@axis.com> | 2022-08-29 14:46:39 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2022-11-16 23:20:30 +0100 |
| commit | fe0157ba679dc95407dd5eae6550a4ceaea75040 (patch) | |
| tree | 6e70d0d3a9b8580a99bb651c36deafabd18b9b3c /drivers/rtc | |
| parent | eec79501cce6e8965e92174760c6a9e92d78a038 (diff) | |
| download | linux-stable-fe0157ba679dc95407dd5eae6550a4ceaea75040.tar.gz linux-stable-fe0157ba679dc95407dd5eae6550a4ceaea75040.tar.bz2 linux-stable-fe0157ba679dc95407dd5eae6550a4ceaea75040.zip | |
rtc: pcf8523: fix for stop bit
Bugfix for an issue detected when a goldcap capacitor gets
fully discharged due to a long absence of the power supply,
and then recharges again. The RTC failed to continue to keep
the real-time clock.
This was caused by the incorrect handling of the STOP bit in
the RTC internal register. This fix solves the problem.
Signed-off-by: paulmn <paulmn@axis.com>
Link: https://lore.kernel.org/r/20220829124639.10906-1-paulmn@axis.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-pcf8523.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c index 6174b3fd4b98..92de99f11a7a 100644 --- a/drivers/rtc/rtc-pcf8523.c +++ b/drivers/rtc/rtc-pcf8523.c @@ -99,24 +99,24 @@ static irqreturn_t pcf8523_irq(int irq, void *dev_id) static int pcf8523_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct pcf8523 *pcf8523 = dev_get_drvdata(dev); - u8 regs[7]; + u8 regs[10]; int err; - err = regmap_bulk_read(pcf8523->regmap, PCF8523_REG_SECONDS, regs, + err = regmap_bulk_read(pcf8523->regmap, PCF8523_REG_CONTROL1, regs, sizeof(regs)); if (err < 0) return err; - if (regs[0] & PCF8523_SECONDS_OS) + if ((regs[0] & PCF8523_CONTROL1_STOP) || (regs[3] & PCF8523_SECONDS_OS)) return -EINVAL; - tm->tm_sec = bcd2bin(regs[0] & 0x7f); - tm->tm_min = bcd2bin(regs[1] & 0x7f); - tm->tm_hour = bcd2bin(regs[2] & 0x3f); - tm->tm_mday = bcd2bin(regs[3] & 0x3f); - tm->tm_wday = regs[4] & 0x7; - tm->tm_mon = bcd2bin(regs[5] & 0x1f) - 1; - tm->tm_year = bcd2bin(regs[6]) + 100; + tm->tm_sec = bcd2bin(regs[3] & 0x7f); + tm->tm_min = bcd2bin(regs[4] & 0x7f); + tm->tm_hour = bcd2bin(regs[5] & 0x3f); + tm->tm_mday = bcd2bin(regs[6] & 0x3f); + tm->tm_wday = regs[7] & 0x7; + tm->tm_mon = bcd2bin(regs[8] & 0x1f) - 1; + tm->tm_year = bcd2bin(regs[9]) + 100; return 0; } |