From: Benjamin Herrenschmidt Date: Thu, 29 Sep 2011 05:57:01 +0000 (+1000) Subject: powerpc: Fix device-tree matching for Apple U4 bridge X-Git-Tag: v5.15~24016 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=16fa42affd484bb500533a7e78e0c72687eddd58;p=platform%2Fkernel%2Flinux-starfive.git powerpc: Fix device-tree matching for Apple U4 bridge Apple Quad G5 has some oddity in it's device-tree which causes the new generic matching code to fail to relate nodes for PCI-E devices below U4 with their respective struct pci_dev. This breaks graphics on those machines among others. This fixes it using a quirk which copies the node pointer from the host bridge for the root complex, which makes the generic code work for the children afterward. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Linus Torvalds --- diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c index 5cc83851ad06..31a7d3a7ce25 100644 --- a/arch/powerpc/platforms/powermac/pci.c +++ b/arch/powerpc/platforms/powermac/pci.c @@ -561,6 +561,20 @@ static struct pci_ops u4_pcie_pci_ops = .write = u4_pcie_write_config, }; +static void __devinit pmac_pci_fixup_u4_of_node(struct pci_dev *dev) +{ + /* Apple's device-tree "hides" the root complex virtual P2P bridge + * on U4. However, Linux sees it, causing the PCI <-> OF matching + * code to fail to properly match devices below it. This works around + * it by setting the node of the bridge to point to the PHB node, + * which is not entirely correct but fixes the matching code and + * doesn't break anything else. It's also the simplest possible fix. + */ + if (dev->dev.of_node == NULL) + dev->dev.of_node = pcibios_get_phb_of_node(dev->bus); +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, 0x5b, pmac_pci_fixup_u4_of_node); + #endif /* CONFIG_PPC64 */ #ifdef CONFIG_PPC32