Merge branch 'pci/controller/dwc'

- Move DBI accesses from dw_pcie_ep_init() to dw_pcie_ep_init_complete() so
  drivers for endpoints that require Refclk for DBI access, e.g., qcom and
  tegra194, can control when this happens (Manivannan Sadhasivam)

- Add endpoint API kernel-doc (Manivannan Sadhasivam)

- Remove .deinit() callback and instead call rcar_gen4_pcie_ep_deinit()
  explicitly from rcar-gen4, which was the only user (Manivannan
  Sadhasivam)

- Rename dw_pcie_ep_exit() to dw_pcie_ep_deinit() to correspond with
  dw_pcie_ep_init() (Manivannan Sadhasivam)

- Add dw_pcie_ep_cleanup() for drivers that need to clean up eDMA resources
  when PERST# is asserted, e.g., qcom, tegra194 (Manivannan Sadhasivam)

- Rename dw_pcie_ep_init_complete() to dw_pcie_ep_init_registers() to
  better reflect the functionality (Manivannan Sadhasivam)

- Call dw_pcie_ep_init_registers() directly from drivers instead of from
  dw_pcie_ep_init() so drivers, e.g., qcom and tegra194, can do it when
  Refclk is available (Manivannan Sadhasivam)

- Remove the "core_init_notifier" flag, which previously identified drivers
  that required Refclk before DBI access, because it's now unnecessary
  (Manivannan Sadhasivam)

* pci/controller/dwc:
  PCI: endpoint: Remove "core_init_notifier" flag
  PCI: dwc: ep: Call dw_pcie_ep_init_registers() API directly from all glue drivers
  PCI: dwc: ep: Rename dw_pcie_ep_init_complete() to dw_pcie_ep_init_registers()
  PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API for drivers supporting PERST#
  PCI: dwc: ep: Rename dw_pcie_ep_exit() to dw_pcie_ep_deinit()
  PCI: dwc: ep: Remove deinit() callback from struct dw_pcie_ep_ops
  PCI: dwc: ep: Add Kernel-doc comments for APIs
  PCI: dwc: ep: Fix DBI access failure for drivers requiring refclk from host

Author: bjorn-helgaas

drivers/pci/controller/cadence/pcie-cadence-ep.c

@@ -743,6 +743,8 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)
 
 	spin_lock_init(&ep->lock);
 
+	pci_epc_init_notify(epc);
+
 	return 0;
 
  free_epc_mem:

drivers/pci/controller/dwc/pci-dra7xx.c

@@ -467,6 +467,15 @@ static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
 		return ret;
 	}
 
+	ret = dw_pcie_ep_init_registers(ep);
+	if (ret) {
+		dev_err(dev, "Failed to initialize DWC endpoint registers\n");
+		dw_pcie_ep_deinit(ep);
+		return ret;
+	}
+
+	dw_pcie_ep_init_notify(ep);
+
 	return 0;
 }
 

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

@@ -1123,6 +1123,16 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,
 		dev_err(dev, "failed to initialize endpoint\n");
 		return ret;
 	}
+
+	ret = dw_pcie_ep_init_registers(ep);
+	if (ret) {
+		dev_err(dev, "Failed to initialize DWC endpoint registers\n");
+		dw_pcie_ep_deinit(ep);
+		return ret;
+	}
+
+	dw_pcie_ep_init_notify(ep);
+
 	/* Start LTSSM. */
 	imx6_pcie_ltssm_enable(dev);
 

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

@@ -1286,6 +1286,15 @@ static int ks_pcie_probe(struct platform_device *pdev)
 		ret = dw_pcie_ep_init(&pci->ep);
 		if (ret < 0)
 			goto err_get_sync;
+
+		ret = dw_pcie_ep_init_registers(&pci->ep);
+		if (ret) {
+			dev_err(dev, "Failed to initialize DWC endpoint registers\n");
+			goto err_ep_init;
+		}
+
+		dw_pcie_ep_init_notify(&pci->ep);
+
 		break;
 	default:
 		dev_err(dev, "INVALID device type %d\n", mode);
@@ -1295,6 +1304,8 @@ static int ks_pcie_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_ep_init:
+	dw_pcie_ep_deinit(&pci->ep);
 err_get_sync:
 	pm_runtime_put(dev);
 	pm_runtime_disable(dev);

drivers/pci/controller/dwc/pci-layerscape-ep.c

@@ -279,6 +279,15 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = dw_pcie_ep_init_registers(&pci->ep);
+	if (ret) {
+		dev_err(dev, "Failed to initialize DWC endpoint registers\n");
+		dw_pcie_ep_deinit(&pci->ep);
+		return ret;
+	}
+
+	dw_pcie_ep_init_notify(&pci->ep);
+
 	return ls_pcie_ep_interrupt_init(pcie, pdev);
 }
 

drivers/pci/controller/dwc/pcie-artpec6.c

@@ -441,7 +441,20 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
 
 		pci->ep.ops = &pcie_ep_ops;
 
-		return dw_pcie_ep_init(&pci->ep);
+		ret = dw_pcie_ep_init(&pci->ep);
+		if (ret)
+			return ret;
+
+		ret = dw_pcie_ep_init_registers(&pci->ep);
+		if (ret) {
+			dev_err(dev, "Failed to initialize DWC endpoint registers\n");
+			dw_pcie_ep_deinit(&pci->ep);
+			return ret;
+		}
+
+		dw_pcie_ep_init_notify(&pci->ep);
+
+		break;
 	default:
 		dev_err(dev, "INVALID device type %d\n", artpec6_pcie->mode);
 	}