diff options
| author |   Jayachandran C <jchandra@broadcom.com> | 2013-01-14 15:11:58 +0000 |
|---|---|---|
| committer |   John Crispin <blogic@openwrt.org> | 2013-02-17 00:15:20 +0100 |
| commit | 8cd3d64c5714de7e17eccde48837b329f67bd85e (patch) | |
| tree | 98a584e60cd4ec7fbaaebf04c85f2dc04b12e3bd /arch/mips/pci/pci-xlp.c | |
| parent | MIPS: Netlogic: Use PIC timer as a clocksource (diff) | |
| download | linux-dev-8cd3d64c5714de7e17eccde48837b329f67bd85e.tar.xz linux-dev-8cd3d64c5714de7e17eccde48837b329f67bd85e.zip | |
MIPS: PCI: Prevent hang on XLP reg read
Reading PCI extended register at 0x255 on a bridge will hang if there
is no device connected on the link. Make PCI read routine skip this
register.
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4789/
Signed-off-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'arch/mips/pci/pci-xlp.c')
| -rw-r--r-- | arch/mips/pci/pci-xlp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/mips/pci/pci-xlp.c b/arch/mips/pci/pci-xlp.c index 5077148bd67d..fbf001a068a4 100644 --- a/arch/mips/pci/pci-xlp.c +++ b/arch/mips/pci/pci-xlp.c @@ -64,8 +64,12 @@ static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn, u32 data; u32 *cfgaddr; + where &= ~3; + if (bus->number == 0 && PCI_SLOT(devfn) == 1 && where == 0x954) + return 0xffffffff; + cfgaddr = (u32 *)(pci_config_base + - pci_cfg_addr(bus->number, devfn, where & ~3)); + pci_cfg_addr(bus->number, devfn, where)); data = *cfgaddr; return data; } |