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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/pci/controller/pcie-xilinx.c
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@@ -98,7 +98,6 @@
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98
  * @reg_base: IO Mapped Register Base
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99
  * @irq: Interrupt number
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  * @msi_pages: MSI pages
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- * @root_busno: Root Bus number
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  * @dev: Device pointer
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  * @msi_domain: MSI IRQ domain pointer
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  * @leg_domain: Legacy IRQ domain pointer
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@@ -108,7 +107,6 @@
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 	void __iomem *reg_base;
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 	u32 irq;
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 	unsigned long msi_pages;
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-	u8 root_busno;
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 	struct device *dev;
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 	struct irq_domain *msi_domain;
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 	struct irq_domain *leg_domain;
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@@ -162,14 +160,13 @@
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 	struct xilinx_pcie_port *port = bus->sysdata;
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161
 
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 	/* Check if link is up when trying to access downstream ports */
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-	if (bus->number != port->root_busno)
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+	if (!pci_is_root_bus(bus)) {
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 		if (!xilinx_pcie_link_up(port))
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 			return false;
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-
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-	/* Only one device down on each root port */
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-	if (bus->number == port->root_busno && devfn > 0)
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+	} else if (devfn > 0) {
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+		/* Only one device down on each root port */
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 		return false;
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-
169
+	}
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 	return true;
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171
 }
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172
 
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@@ -582,14 +579,7 @@
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 	struct device *dev = port->dev;
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 	struct device_node *node = dev->of_node;
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 	struct resource regs;
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-	const char *type;
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582
 	int err;
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-
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-	type = of_get_property(node, "device_type", NULL);
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-	if (!type || strcmp(type, "pci")) {
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-		dev_err(dev, "invalid \"device_type\" %s\n", type);
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-		return -EINVAL;
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-	}
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583
 
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 	err = of_address_to_resource(node, 0, &regs);
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 	if (err) {
..
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@@ -623,11 +613,8 @@
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 {
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 	struct device *dev = &pdev->dev;
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 	struct xilinx_pcie_port *port;
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-	struct pci_bus *bus, *child;
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 	struct pci_host_bridge *bridge;
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 	int err;
629
-	resource_size_t iobase = 0;
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-	LIST_HEAD(res);
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618
 
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 	if (!dev->of_node)
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 		return -ENODEV;
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@@ -654,45 +641,14 @@
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 		return err;
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 	}
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643
 
657
-	err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res,
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-						    &iobase);
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-	if (err) {
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-		dev_err(dev, "Getting bridge resources failed\n");
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-		return err;
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-	}
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-
664
-	err = devm_request_pci_bus_resources(dev, &res);
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-	if (err)
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-		goto error;
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-
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-
669
-	list_splice_init(&res, &bridge->windows);
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-	bridge->dev.parent = dev;
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644
 	bridge->sysdata = port;
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-	bridge->busnr = 0;
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 	bridge->ops = &xilinx_pcie_ops;
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-	bridge->map_irq = of_irq_parse_and_map_pci;
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-	bridge->swizzle_irq = pci_common_swizzle;
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646
 
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 #ifdef CONFIG_PCI_MSI
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 	xilinx_pcie_msi_chip.dev = dev;
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 	bridge->msi = &xilinx_pcie_msi_chip;
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 #endif
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-	err = pci_scan_root_bus_bridge(bridge);
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-	if (err < 0)
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-		goto error;
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-
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-	bus = bridge->bus;
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-
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-	pci_assign_unassigned_bus_resources(bus);
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-	list_for_each_entry(child, &bus->children, node)
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-		pcie_bus_configure_settings(child);
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-	pci_bus_add_devices(bus);
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-	return 0;
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-
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-error:
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-	pci_free_resource_list(&res);
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-	return err;
651
+	return pci_host_probe(bridge);
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 }
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653
 
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654
 static const struct of_device_id xilinx_pcie_of_match[] = {