6.6-stable review patch. If anyone has any objections, please let me know.
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From: Meagan Lloyd meaganlloyd@linux.microsoft.com
[ Upstream commit 523923cfd5d622b8f4ba893fdaf29fa6adeb8c3e ]
In using CONFIG_RTC_HCTOSYS, rtc_hctosys() will sync the RTC time to the kernel time as long as rtc_read_time() succeeds. In some power loss situations, our supercapacitor-backed DS1342 RTC comes up with either an unpredictable future time or the default 01/01/00 from the datasheet. The oscillator stop flag (OSF) is set in these scenarios due to the power loss and can be used to determine the validity of the RTC data.
This change expands the oscillator stop flag (OSF) handling that has already been implemented for some chips to the ds1341 chip (DS1341 and DS1342 share a datasheet). This handling manages the validity of the RTC data in .read_time and .set_time based on the OSF.
Signed-off-by: Meagan Lloyd meaganlloyd@linux.microsoft.com Reviewed-by: Tyler Hicks code@tyhicks.com Acked-by: Rodolfo Giometti giometti@enneenne.com Link: https://lore.kernel.org/r/1749665656-30108-3-git-send-email-meaganlloyd@linu... Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/rtc/rtc-ds1307.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index e14981383c01..ae115c3fcf19 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -274,6 +274,13 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t) if (tmp & DS1340_BIT_OSF) return -EINVAL; break; + case ds_1341: + ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &tmp); + if (ret) + return ret; + if (tmp & DS1337_BIT_OSF) + return -EINVAL; + break; case ds_1388: ret = regmap_read(ds1307->regmap, DS1388_REG_FLAG, &tmp); if (ret) @@ -372,6 +379,10 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t) regmap_update_bits(ds1307->regmap, DS1340_REG_FLAG, DS1340_BIT_OSF, 0); break; + case ds_1341: + regmap_update_bits(ds1307->regmap, DS1337_REG_STATUS, + DS1337_BIT_OSF, 0); + break; case ds_1388: regmap_update_bits(ds1307->regmap, DS1388_REG_FLAG, DS1388_BIT_OSF, 0);