diff options
| author |   Gabe Black <gabe.black@ni.com> | 2009-10-06 09:19:45 -0500 |
|---|---|---|
| committer |   Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-10-07 09:28:17 -0700 |
| commit | 1f56f4a2b4d12c1c348cab23024024396ec7cddc (patch) | |
| tree | 0b7f00bebd3e613d929791549d44689e9aa0387b /drivers/pci | |
| parent | PCI PM: Read device power state from register after updating it (diff) | |
| download | linux-dev-1f56f4a2b4d12c1c348cab23024024396ec7cddc.tar.xz linux-dev-1f56f4a2b4d12c1c348cab23024024396ec7cddc.zip | |
PCI quirk: TI XIO200a erroneously reports support for fast b2b transfers
This quirk will disable fast back to back transfer on the secondary bus
segment of the TI Bridge.
Signed-off-by: Gabe Black <gabe.black@ni.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/quirks.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 6099facecd79..efa6534a6593 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -670,6 +670,25 @@ static void __devinit quirk_vt8235_acpi(struct pci_dev *dev) } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, quirk_vt8235_acpi); +/* + * TI XIO2000a PCIe-PCI Bridge erroneously reports it supports fast back-to-back: + * Disable fast back-to-back on the secondary bus segment + */ +static void __devinit quirk_xio2000a(struct pci_dev *dev) +{ + struct pci_dev *pdev; + u16 command; + + dev_warn(&dev->dev, "TI XIO2000a quirk detected; " + "secondary bus fast back-to-back transfers disabled\n"); + list_for_each_entry(pdev, &dev->subordinate->devices, bus_list) { + pci_read_config_word(pdev, PCI_COMMAND, &command); + if (command & PCI_COMMAND_FAST_BACK) + pci_write_config_word(pdev, PCI_COMMAND, command & ~PCI_COMMAND_FAST_BACK); + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XIO2000A, + quirk_xio2000a); #ifdef CONFIG_X86_IO_APIC |