powerpc: Fix boot hang regression on MPC8544DS
Commit 00c5372d37
caused the MPC8544DS
board to hang at boot. The MPC8544DS is unique in that it doesn't use
the PCI slots on the ULI (unlike the MPC8572DS or MPC8610HPCD). So
the dummy read at the end of the address space causes us to hang.
We can detect the situation by comparing the bridge's BARs versus
the root complex.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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parent
4a77035828
commit
1fce2d01df
arch/powerpc/platforms
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@ -219,11 +219,21 @@ static void __devinit quirk_final_uli5249(struct pci_dev *dev)
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int i;
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u8 *dummy;
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struct pci_bus *bus = dev->bus;
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resource_size_t end = 0;
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for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCES+3; i++) {
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unsigned long flags = pci_resource_flags(dev, i);
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if ((flags & (IORESOURCE_MEM|IORESOURCE_PREFETCH)) == IORESOURCE_MEM)
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end = pci_resource_end(dev, i);
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}
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for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
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if ((bus->resource[i]) &&
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(bus->resource[i]->flags & IORESOURCE_MEM)) {
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dummy = ioremap(bus->resource[i]->end - 3, 0x4);
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if (bus->resource[i]->end == end)
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dummy = ioremap(bus->resource[i]->start, 0x4);
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else
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dummy = ioremap(bus->resource[i]->end - 3, 0x4);
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if (dummy) {
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in_8(dummy);
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iounmap(dummy);
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