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PCI: add PCI-X/PCI-Express read control interfaces

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This patch introduces an interface to read and write PCI-X / PCI-Express 
maximum read byte count values from PCI config space. There is a second 
function that returns the maximum _designed_ read byte count, which marks the 
maximum value for a device, since some drivers try to set MMRBC to the 
highest allowed value and rely on such a function.

Based on patch set by Stephen Hemminger <shemminger@linux-foundation.org>

Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Peter Oruba <peter.oruba@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Peter Oruba
2007-05-15 13:59:13 +02:00
committed by Greg Kroah-Hartman
parent e4585da22a
commit d556ad4bbe
3 changed files with 182 additions and 1 deletions
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16
drivers/pci/quirks.c
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@@ -627,6 +627,22 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_amd_8131_ioapic);
#endif /* CONFIG_X86_IO_APIC */
/*
* Some settings of MMRBC can lead to data corruption so block changes.
* See AMD 8131 HyperTransport PCI-X Tunnel Revision Guide
*/
static void __init quirk_amd_8131_mmrbc(struct pci_dev *dev)
{
unsigned char revid;
pci_read_config_byte(dev, PCI_REVISION_ID, &revid);
if (dev->subordinate && revid <= 0x12) {
printk(KERN_INFO "AMD8131 rev %x detected, disabling PCI-X MMRBC\n",
revid);
dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MMRBC;
}
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_amd_8131_mmrbc);
/*
* FIXME: it is questionable that quirk_via_acpi