diff --git a/drivers/spi/spi-sprd-adi.c b/drivers/spi/spi-sprd-adi.c
index df5960bddfe6129afde034f70c363fcdca3f3c67..f1fc2bde6ef307cd494d4babb3101d90b3fe959a 100644
--- a/drivers/spi/spi-sprd-adi.c
+++ b/drivers/spi/spi-sprd-adi.c
@@ -367,6 +367,9 @@ static int sprd_adi_restart_handler(struct notifier_block *this,
 	val |= BIT_WDG_RUN | BIT_WDG_RST;
 	sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val);
 
+	/* Lock the watchdog */
+	sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, ~WDG_UNLOCK_KEY);
+
 	mdelay(1000);
 
 	dev_emerg(sadi->dev, "Unable to restart system\n");