PCI: rockchip: Disable ltssm after waiting for L2 handshake

We should not disable it before L2, otherwise all L2 transaction
event would be lost for RC side, leading to unstable L2 link stage.

Change-Id: Ia87f8749d4a0acc9aeb1215682209c853672a84d
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

Author: shawn1221

drivers/pci/host/pcie-rockchip.c

@@ -1404,10 +1404,6 @@ static int rockchip_pcie_suspend_for_user(struct device *dev)
 	struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
 	int ret;
 
-	/* disable ltssm */
-	rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_DISABLE,
-			    PCIE_CLIENT_CONFIG);
-
 	/* disable core and cli int since we don't need to ack PME_ACK */
 	rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
 			    PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
@@ -1419,6 +1415,10 @@ static int rockchip_pcie_suspend_for_user(struct device *dev)
 		return ret;
 	}
 
+	/* disable ltssm */
+	rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_DISABLE,
+			    PCIE_CLIENT_CONFIG);
+
 	phy_power_off(rockchip->phy);
 	phy_exit(rockchip->phy);