From 092755367e1a5fcf0f5405e9425e86907199dfce Mon Sep 17 00:00:00 2001 From: Surendra Singh Chouhan Date: Fri, 24 Jul 2026 19:28:03 +0530 Subject: [PATCH] rtc: spacemit: handle regmap_test_bits() error return p1_rtc_read_time() called if (!regmap_test_bits(regmap, RTC_CTRL, RTC_EN)) to check if the RTC was enabled. regmap_test_bits() returns 1 if the bit is set, 0 if not set, and a negative error code (e.g. -EIO) if reading the control register fails. Using !regmap_test_bits(...) evaluates a negative error code as boolean false, causing I2C/regmap read failures to be ignored and incorrectly proceeding to read time registers from a failing device. Fix this by capturing the return value of regmap_test_bits() and returning the error code if negative, or -EINVAL if the RTC is disabled. Fixes: a6de182daa2b ("rtc: spacemit: support the SpacemiT P1 RTC") Reviewed-by: Alex Elder Signed-off-by: Surendra Singh Chouhan Link: https://patch.msgid.link/20260724135803.81223-1-kr494167@gmail.com Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-spacemit-p1.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-spacemit-p1.c b/drivers/rtc/rtc-spacemit-p1.c index 43ab62494bb4..1de7bd995d29 100644 --- a/drivers/rtc/rtc-spacemit-p1.c +++ b/drivers/rtc/rtc-spacemit-p1.c @@ -57,8 +57,9 @@ static int p1_rtc_read_time(struct device *dev, struct rtc_time *t) u8 time[6]; int ret; - if (!regmap_test_bits(regmap, RTC_CTRL, RTC_EN)) - return -EINVAL; /* RTC is disabled */ + ret = regmap_test_bits(regmap, RTC_CTRL, RTC_EN); + if (ret <= 0) + return ret ?: -EINVAL; /* RTC is disabled or error */ ret = regmap_bulk_read(regmap, RTC_TIME, time, sizeof(time)); if (ret)