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 | |
| parent | e13cdbd71fe12c4e191b737c4a3dbfdb4b2de03b (diff) | |
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>
| -rw-r--r-- | drivers/pci/quirks.c | 19 | ||||
| -rw-r--r-- | include/linux/pci_ids.h | 1 |
2 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 6099facecd7..efa6534a659 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 diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index da1fda8623e..f490e7a7307 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -776,6 +776,7 @@ #define PCI_DEVICE_ID_TI_X515 0x8036 #define PCI_DEVICE_ID_TI_XX12 0x8039 #define PCI_DEVICE_ID_TI_XX12_FM 0x803b +#define PCI_DEVICE_ID_TI_XIO2000A 0x8231 #define PCI_DEVICE_ID_TI_1130 0xac12 #define PCI_DEVICE_ID_TI_1031 0xac13 #define PCI_DEVICE_ID_TI_1131 0xac15 |