MIPS: pci-legacy: stop using of_pci_range_to_resource

[ Upstream commit 3ecb9dc1581eebecaee56decac70e35365260866 ]

Mirror commit aeba3731b150 ("powerpc/pci: Fix IO space breakage after
of_pci_range_to_resource() change").

Most MIPS platforms do not define PCI_IOBASE, nor implement
pci_address_to_pio(). Moreover, IO_SPACE_LIMIT is 0xffff for most MIPS
platforms. of_pci_range_to_resource passes the _start address_ of the IO
range into pci_address_to_pio, which then checks it against
IO_SPACE_LIMIT and fails, because for MIPS platforms that use
pci-legacy (pci-lantiq, pci-rt3883, pci-mt7620), IO ranges start much
higher than 0xffff.

In fact, pci-mt7621 in staging already works around this problem, see
commit 09dd629eeabb ("staging: mt7621-pci: fix io space and properly set
resource limits")

So just stop using of_pci_range_to_resource, which does not work for
MIPS.

Fixes PCI errors like:
  pci_bus 0000:00: root bus resource [io  0xffffffff]

Fixes: 0b0b0893d49b ("of/pci: Fix the conversion of IO ranges into IO resources")
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Cc: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c
index 39052de..3a90919 100644 (file)
--- a/arch/mips/pci/pci-legacy.c
+++ b/arch/mips/pci/pci-legacy.c
@@ -166,8 +166,13 @@ void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
                        res = hose->mem_resource;
                        break;
                }
-               if (res != NULL)
-                       of_pci_range_to_resource(&range, node, res);
+               if (res != NULL) {
+                       res->name = node->full_name;
+                       res->flags = range.flags;
+                       res->start = range.cpu_addr;
+                       res->end = range.cpu_addr + range.size - 1;
+                       res->parent = res->child = res->sibling = NULL;
+               }
        }
 }