PCI: dwc: Detect iATU settings after getting "addr_space" resource

Previously, dw_pcie_ep_init() did:

  dw_pcie_iatu_detect(pci);
  res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
  if (!res)
    return -EINVAL;

The platform_get_resource_byname() can fail, and dw_pcie_iatu_detect()
doesn't depend on the "addr_space" resource, so delay it until afterwards,
i.e.,

  platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
  dw_pcie_iatu_detect(pci);

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20220624143947.8991-3-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 15b8059544e347da56fa211b96753770d99b24da..1e35542d6f725a1a6f20fb91c9649cfc798d8c09 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -704,8 +704,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
                }
        }
 
-       dw_pcie_iatu_detect(pci);
-
        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
        if (!res)
                return -EINVAL;
@@ -713,6 +711,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
        ep->phys_base = res->start;
        ep->addr_size = resource_size(res);
 
+       dw_pcie_iatu_detect(pci);
+
        ep->ib_window_map = devm_kcalloc(dev,
                                         BITS_TO_LONGS(pci->num_ib_windows),
                                         sizeof(long),