phy: rockchip: inno_usb2: only reset phy if deassert iddq for rk3588

The current code always reset the usb2 phy in the
rk3588_usb2phy_tuning(), this cause the usb core
reset the device which connected to the usb2 host
interface during pm resume. Actually, it only needs
to reset the phy when it exit from iddq mode, so
add this patch to reset phy more reasonably, and
avoid reset usb device during pm resume.

Signed-off-by: William Wu <william.wu@rock-chips.com>
Change-Id: I296636321d0cbe6b7ee7be9bd1614237a34312e9

drivers/phy/rockchip/phy-rockchip-inno-usb2.c

@@ -2692,18 +2692,26 @@ static int rk3568_vbus_detect_control(struct rockchip_usb2phy *rphy, bool en)
 
 static int rk3588_usb2phy_tuning(struct rockchip_usb2phy *rphy)
 {
+	unsigned int reg;
 	int ret = 0;
 
-	/* Deassert SIDDQ to power on analog block */
-	ret = regmap_write(rphy->grf, 0x0008,
-			   GENMASK(29, 29) | 0x0000);
+	/* Read the SIDDQ control register */
+	ret = regmap_read(rphy->grf, 0x0008, &reg);
 	if (ret)
 		return ret;
 
-	/* Do reset after exit IDDQ mode */
-	ret = rockchip_usb2phy_reset(rphy);
-	if (ret)
-		return ret;
+	if (reg & BIT(13)) {
+		/* Deassert SIDDQ to power on analog block */
+		ret = regmap_write(rphy->grf, 0x0008,
+				   GENMASK(29, 29) | 0x0000);
+		if (ret)
+			return ret;
+
+		/* Do reset after exit IDDQ mode */
+		ret = rockchip_usb2phy_reset(rphy);
+		if (ret)
+			return ret;
+	}
 
 	if (rphy->phy_cfg->reg == 0x0000) {
 		/*