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authorpaulmn <paulmn@axis.com>2022-08-29 15:46:39 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2022-11-17 01:20:30 +0300
commitfe0157ba679dc95407dd5eae6550a4ceaea75040 (patch)
tree6e70d0d3a9b8580a99bb651c36deafabd18b9b3c /drivers/rtc/rtc-pcf8523.c
parenteec79501cce6e8965e92174760c6a9e92d78a038 (diff)
downloadlinux-fe0157ba679dc95407dd5eae6550a4ceaea75040.tar.xz
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/rtc-pcf8523.c')
-rw-r--r--drivers/rtc/rtc-pcf8523.c20
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;
}