PCI: imx6: Return -ETIMEOUT from imx6_pcie_wait_for_speed_change()

Change error code from -EINVAL to -ETIMEDOUT in
imx6_pcie_wait_for_speed_change() since that error code seems more
appropriate.
Signed-off-by: NAndrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org

drivers/pci/controller/dwc/pci-imx6.c

@@ -739,7 +739,7 @@ static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
 	}
 
 	dev_err(dev, "Speed change timeout\n");
-	return -EINVAL;
+	return -ETIMEDOUT;
 }
 
 static void imx6_pcie_ltssm_enable(struct device *dev)