summaryrefslogtreecommitdiff
path: root/drivers/pci/quirks.c
diff options
context:
space:
mode:
authorPeter Oruba <peter.oruba@amd.com>2007-05-15 13:59:13 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-11 16:02:07 -0700
commitd556ad4bbe75faf17b239e151a9f003322b2e851 (patch)
tree794e4f21a9c6e76328feccf313e4d268d3ec5146 /drivers/pci/quirks.c
parente4585da22ad04a055cbb5c863a37aa8cc02eac89 (diff)
PCI: add PCI-X/PCI-Express read control interfaces
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>
Diffstat (limited to 'drivers/pci/quirks.c')
-rw-r--r--drivers/pci/quirks.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 01d8f8a8843c..75bd6a8648f6 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -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