Merge branch 'pci/controller/j721e'

- Add MODULE_DEVICE_TABLE() so driver can be autoloaded (Siddharth
  Vadapalli)

- Power controller off before configuring the glue layer so the controller
  latches the correct values on power-on (Siddharth Vadapalli)

- Correct the error message when j721e_pcie_ctrl_init() fails (Alok Tiwari)

* pci/controller/j721e:
  PCI: j721e: Fix incorrect error message in probe()
  PCI: j721e: Fix programming sequence of "strap" settings
  PCI: j721e: Fix module autoloading

Author: bjorn-helgaas

drivers/pci/controller/cadence/pci-j721e.c

@@ -284,6 +284,25 @@ static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie)
 	if (!ret)
 		offset = args.args[0];
 
+	/*
+	 * The PCIe Controller's registers have different "reset-values"
+	 * depending on the "strap" settings programmed into the PCIEn_CTRL
+	 * register within the CTRL_MMR memory-mapped register space.
+	 * The registers latch onto a "reset-value" based on the "strap"
+	 * settings sampled after the PCIe Controller is powered on.
+	 * To ensure that the "reset-values" are sampled accurately, power
+	 * off the PCIe Controller before programming the "strap" settings
+	 * and power it on after that. The runtime PM APIs namely
+	 * pm_runtime_put_sync() and pm_runtime_get_sync() will decrement and
+	 * increment the usage counter respectively, causing GENPD to power off
+	 * and power on the PCIe Controller.
+	 */
+	ret = pm_runtime_put_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to power off PCIe Controller\n");
+		return ret;
+	}
+
 	ret = j721e_pcie_set_mode(pcie, syscon, offset);
 	if (ret < 0) {
 		dev_err(dev, "Failed to set pci mode\n");
@@ -302,6 +321,12 @@ static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie)
 		return ret;
 	}
 
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to power on PCIe Controller\n");
+		return ret;
+	}
+
 	/* Enable ACSPCIE refclk output if the optional property exists */
 	syscon = syscon_regmap_lookup_by_phandle_optional(node,
 						"ti,syscon-acspcie-proxy-ctrl");
@@ -440,6 +465,7 @@ static const struct of_device_id of_j721e_pcie_match[] = {
 	},
 	{},
 };
+MODULE_DEVICE_TABLE(of, of_j721e_pcie_match);
 
 static int j721e_pcie_probe(struct platform_device *pdev)
 {
@@ -549,7 +575,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 
 	ret = j721e_pcie_ctrl_init(pcie);
 	if (ret < 0) {
-		dev_err_probe(dev, ret, "pm_runtime_get_sync failed\n");
+		dev_err_probe(dev, ret, "j721e_pcie_ctrl_init failed\n");
 		goto err_get_sync;
 	}