powerpc/fsl/pci: Fix PCIe fixup regression

Upstream changes to the way PHB resources are registered
broke the resource fixup for FSL boards.

We can no longer rely on the resource pointer array for the PHB's
pci_bus structure, so let's leave it alone and go straight for
the PHB resources instead. This also makes the code generally
more readable.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 30eb17ecad493f8d459beb2d6c60ed882c86a326..6073288fed29889399bb640bc22f709043363f72 100644 (file)
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -385,26 +385,36 @@ static void __init setup_pci_cmd(struct pci_controller *hose)
 void fsl_pcibios_fixup_bus(struct pci_bus *bus)
 {
        struct pci_controller *hose = pci_bus_to_host(bus);
-       int i;
-
-       if ((bus->parent == hose->bus) &&
-           ((fsl_pcie_bus_fixup &&
-             early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) ||
-            (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK)))
-       {
-               for (i = 0; i < 4; ++i) {
+       int i, is_pcie = 0, no_link;
+
+       /* The root complex bridge comes up with bogus resources,
+        * we copy the PHB ones in.
+        *
+        * With the current generic PCI code, the PHB bus no longer
+        * has bus->resource[0..4] set, so things are a bit more
+        * tricky.
+        */
+
+       if (fsl_pcie_bus_fixup)
+               is_pcie = early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP);
+       no_link = !!(hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK);
+
+       if (bus->parent == hose->bus && (is_pcie || no_link)) {
+               for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; ++i) {
                        struct resource *res = bus->resource[i];
-                       struct resource *par = bus->parent->resource[i];
-                       if (res) {
-                               res->start = 0;
-                               res->end   = 0;
-                               res->flags = 0;
-                       }
-                       if (res && par) {
-                               res->start = par->start;
-                               res->end   = par->end;
-                               res->flags = par->flags;
-                       }
+                       struct resource *par;
+
+                       if (!res)
+                               continue;
+                       if (i == 0)
+                               par = &hose->io_resource;
+                       else if (i < 4)
+                               par = &hose->mem_resources[i-1];
+                       else par = NULL;
+
+                       res->start = par ? par->start : 0;
+                       res->end   = par ? par->end   : 0;
+                       res->flags = par ? par->flags : 0;
                }
        }
 }