diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
index 5269968b3060..b932087c55b2 100644
--- a/drivers/phy/sunplus/phy-sunplus-usb2.c
+++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
@@ -92,13 +92,13 @@ static int update_disc_vol(struct sp_usbphy *usbphy)
 	otp_v = nvmem_cell_read(cell, &otp_l);
 	nvmem_cell_put(cell);
 
-	if (otp_v) {
+	if (!IS_ERR(otp_v)) {
 		set = *(otp_v + 1);
 		set = (set << (sizeof(char) * 8)) | *otp_v;
 		set = (set >> usbphy->disc_vol_addr_off) & J_DISC;
 	}
 
-	if (!otp_v || set == 0)
+	if (IS_ERR(otp_v) || set == 0)
 		set = OTP_DISC_LEVEL_DEFAULT;
 
 	val = readl(usbphy->phy_regs + CONFIG7);