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| author | Paul Mackerras <paulus@samba.org> | 2008-12-28 14:12:57 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-01-08 16:25:11 +1100 |
| commit | 16124f10df43e6e08783f1fede6888bf36ac705c (patch) | |
| tree | e968c899a9dffaf7d10a8c698ae54d3259e56d71 /arch/powerpc/kernel/pci_64.c | |
| parent | 1d5bc03a8183d12c7daf4e7c69cce8d9c4b9a86b (diff) | |
| download | linux-16124f10df43e6e08783f1fede6888bf36ac705c.tar.bz2 | |
powerpc: Fix pciconfig_iobase system call on PCI-Express powermac
X has been failing to start on my quad G5 powermac since commit
1fd0f52583a85b21a394201b007bc1ee104b235d ("powerpc: Fix domain numbers
in /proc on 64-bit") went in. The reason is that the change allows X
to see the PCI-PCI bridge above the video card (previously it was
obscured by the fact that there were two "00" directories in
/proc/bus/pci), and the pciconfig_iobase system call on the bridge is
failing because of a hack that we have to return information about the
AGP bus when X asks about bus 0. This machine doesn't have an AGP bus
(it has PCI Express) and so the pciconfig_iobase call is returning -1,
which ultimately causes X to fail to start.
This fixes it by checking that we have an AGP bridge before
redirecting the pciconfig_iobase call to return information about the
AGP bus. With this, X starts successfully both on a quad G5 with
PCI Express and on an older dual G5 with AGP.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/pci_64.c')
| -rw-r--r-- | arch/powerpc/kernel/pci_64.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c index 39fadc6e1492..586962f65c2a 100644 --- a/arch/powerpc/kernel/pci_64.c +++ b/arch/powerpc/kernel/pci_64.c @@ -560,9 +560,14 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus, * G5 machines... So when something asks for bus 0 io base * (bus 0 is HT root), we return the AGP one instead. */ - if (machine_is_compatible("MacRISC4")) - if (in_bus == 0) + if (in_bus == 0 && machine_is_compatible("MacRISC4")) { + struct device_node *agp; + + agp = of_find_compatible_node(NULL, NULL, "u3-agp"); + if (agp) in_bus = 0xf0; + of_node_put(agp); + } /* That syscall isn't quite compatible with PCI domains, but it's * used on pre-domains setup. We return the first match |