Merge branch 'remotes/lorenzo/pci/imx6'

- Allow host controller driver to probe successfully (as other drivers do)
  even if link is currently down (Fabio Estevam)

- Enable i.MX6QP PCIe power management (Richard Zhu)

- Invoke PHY exit function after PHY power off (Richard Zhu)

- Assert i.MX8MM CLKREQ# even if no device present to avoid boot hangs
  (Richard Zhu)

* remotes/lorenzo/pci/imx6:
  PCI: imx6: Assert i.MX8MM CLKREQ# even if no device present
  PCI: imx6: Invoke the PHY exit function after PHY power off
  PCI: imx6: Enable i.MX6QP PCIe power management support
  PCI: imx6: Allow to probe when dw_pcie_wait_for_link() fails

Author: bjorn-helgaas

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

@@ -453,10 +453,6 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 	case IMX7D:
 		break;
 	case IMX8MM:
-		ret = clk_prepare_enable(imx6_pcie->pcie_aux);
-		if (ret)
-			dev_err(dev, "unable to enable pcie_aux clock\n");
-		break;
 	case IMX8MQ:
 		ret = clk_prepare_enable(imx6_pcie->pcie_aux);
 		if (ret) {
@@ -809,9 +805,7 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
 	/* Start LTSSM. */
 	imx6_pcie_ltssm_enable(dev);
 
-	ret = dw_pcie_wait_for_link(pci);
-	if (ret)
-		goto err_reset_phy;
+	dw_pcie_wait_for_link(pci);
 
 	if (pci->link_gen == 2) {
 		/* Allow Gen2 mode after the link is up. */
@@ -847,11 +841,7 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
 		}
 
 		/* Make sure link training is finished as well! */
-		ret = dw_pcie_wait_for_link(pci);
-		if (ret) {
-			dev_err(dev, "Failed to bring link up!\n");
-			goto err_reset_phy;
-		}
+		dw_pcie_wait_for_link(pci);
 	} else {
 		dev_info(dev, "Link: Gen2 disabled\n");
 	}
@@ -923,6 +913,7 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
 	/* Others poke directly at IOMUXC registers */
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX6SX:
+	case IMX6QP:
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				IMX6SX_GPR12_PCIE_PM_TURN_OFF,
 				IMX6SX_GPR12_PCIE_PM_TURN_OFF);
@@ -983,6 +974,7 @@ static int imx6_pcie_suspend_noirq(struct device *dev)
 	case IMX8MM:
 		if (phy_power_off(imx6_pcie->phy))
 			dev_err(dev, "unable to power off PHY\n");
+		phy_exit(imx6_pcie->phy);
 		break;
 	default:
 		break;
@@ -1252,7 +1244,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 	[IMX6QP] = {
 		.variant = IMX6QP,
 		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
-			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
+			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
+			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.dbi_length = 0x200,
 	},
 	[IMX7D] = {