diff --git a/drivers/rtc/rtc-sc27xx.c b/drivers/rtc/rtc-sc27xx.c
index 6a3876edd8e0..deea5c3726ad 100644
--- a/drivers/rtc/rtc-sc27xx.c
+++ b/drivers/rtc/rtc-sc27xx.c
@@ -35,6 +35,8 @@
 #define SPRD_RTC_DAY_ALM_VALUE		0x4c
 #define SPRD_RTC_SPG_VALUE		0x50
 #define SPRD_RTC_SPG_UPD		0x54
+#define SPRD_RTC_PWR_CTRL		0x58
+#define SPRD_RTC_PWR_STS		0x5c
 #define SPRD_RTC_SEC_AUXALM_UPD		0x60
 #define SPRD_RTC_MIN_AUXALM_UPD		0x64
 #define SPRD_RTC_HOUR_AUXALM_UPD	0x68
@@ -86,7 +88,13 @@
 
 /* SPG values definition for SPRD_RTC_SPG_UPD register */
 #define SPRD_RTC_POWEROFF_ALM_FLAG	BIT(8)
-#define SPRD_RTC_POWER_RESET_FLAG	BIT(9)
+
+/* power control/status definition */
+#define SPRD_RTC_POWER_RESET_VALUE	0x96
+#define SPRD_RTC_POWER_STS_CLEAR	GENMASK(7, 0)
+#define SPRD_RTC_POWER_STS_SHIFT	8
+#define SPRD_RTC_POWER_STS_VALID	\
+	(~SPRD_RTC_POWER_RESET_VALUE << SPRD_RTC_POWER_STS_SHIFT)
 
 /* timeout of synchronizing time and alarm registers (us) */
 #define SPRD_RTC_POLL_TIMEOUT		200000
@@ -383,7 +391,6 @@ static int sprd_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct sprd_rtc *rtc = dev_get_drvdata(dev);
 	time64_t secs = rtc_tm_to_time64(tm);
-	u32 val;
 	int ret;
 
 	ret = sprd_rtc_set_secs(rtc, SPRD_RTC_TIME, secs);
@@ -391,27 +398,20 @@ static int sprd_rtc_set_time(struct device *dev, struct rtc_time *tm)
 		return ret;
 
 	if (!rtc->valid) {
-		/*
-		 * Set SPRD_RTC_POWER_RESET_FLAG to indicate now RTC has valid
-		 * time values.
-		 */
-		ret = regmap_update_bits(rtc->regmap,
-					 rtc->base + SPRD_RTC_SPG_UPD,
-					 SPRD_RTC_POWER_RESET_FLAG,
-					 SPRD_RTC_POWER_RESET_FLAG);
+		/* Clear RTC power status firstly */
+		ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL,
+				   SPRD_RTC_POWER_STS_CLEAR);
 		if (ret)
 			return ret;
 
-		ret = regmap_read_poll_timeout(rtc->regmap,
-					       rtc->base + SPRD_RTC_INT_RAW_STS,
-					       val, (val & SPRD_RTC_SPG_UPD_EN),
-					       SPRD_RTC_POLL_DELAY_US,
-					       SPRD_RTC_POLL_TIMEOUT);
-		if (ret) {
-			dev_err(rtc->dev, "failed to update SPG value:%d\n",
-				ret);
+		/*
+		 * Set RTC power status to indicate now RTC has valid time
+		 * values.
+		 */
+		ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL,
+				   SPRD_RTC_POWER_STS_VALID);
+		if (ret)
 			return ret;
-		}
 
 		rtc->valid = true;
 	}
@@ -562,15 +562,16 @@ static int sprd_rtc_check_power_down(struct sprd_rtc *rtc)
 	u32 val;
 	int ret;
 
-	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);
+	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_PWR_STS, &val);
 	if (ret)
 		return ret;
 
 	/*
-	 * If the SPRD_RTC_POWER_RESET_FLAG was not set, which means the RTC has
-	 * been powered down, so the RTC time values are invalid.
+	 * If the RTC power status value is SPRD_RTC_POWER_RESET_VALUE, which
+	 * means the RTC has been powered down, so the RTC time values are
+	 * invalid.
 	 */
-	rtc->valid = (val & SPRD_RTC_POWER_RESET_FLAG) ? true : false;
+	rtc->valid = val == SPRD_RTC_POWER_RESET_VALUE ? false : true;
 	return 0;
 }