From: Geert Uytterhoeven geert+renesas@glider.be
[ Upstream commit 15d82d22498784966df8e4696174a16b02cc1052 ]
When no alarm has been programmed on RSK-RZA1, an error message is printed during boot:
rtc rtc0: invalid alarm value: 2019-03-14T255:255:255
sh_rtc_read_alarm_value() returns 0xff when querying a hardware alarm field that is not enabled. __rtc_read_alarm() validates the received alarm values, and fills in missing fields when needed. While 0xff is handled fine for the year, month, and day fields, and corrected as considered being out-of-range, this is not the case for the hour, minute, and second fields, where -1 is expected for missing fields.
Fix this by returning -1 instead, as this value is handled fine for all fields.
Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/rtc/rtc-sh.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c index 2b81dd4baf17..104c854d6a8a 100644 --- a/drivers/rtc/rtc-sh.c +++ b/drivers/rtc/rtc-sh.c @@ -455,7 +455,7 @@ static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm) static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off) { unsigned int byte; - int value = 0xff; /* return 0xff for ignored values */ + int value = -1; /* return -1 for ignored values */
byte = readb(rtc->regbase + reg_off); if (byte & AR_ENB) {