diff options
| -rw-r--r-- | drivers/pci/quirks.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 923689f554bb..ab620aca632b 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3385,6 +3385,29 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_JMICRON, PCI_DEVICE_ID_JMICRON_JMB388_ESD, quirk_dma_func1_alias); +/* + * A few PCIe-to-PCI bridges fail to expose a PCIe capability, resulting in + * using the wrong DMA alias for the device. Some of these devices can be + * used as either forward or reverse bridges, so we need to test whether the + * device is operating in the correct mode. We could probably apply this + * quirk to PCI_ANY_ID, but for now we'll just use known offenders. The test + * is for a non-root, non-PCIe bridge where the upstream device is PCIe and + * is not a PCIe-to-PCI bridge, then @pdev is actually a PCIe-to-PCI bridge. + */ +static void quirk_use_pcie_bridge_dma_alias(struct pci_dev *pdev) +{ + if (!pci_is_root_bus(pdev->bus) && + pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE && + !pci_is_pcie(pdev) && pci_is_pcie(pdev->bus->self) && + pci_pcie_type(pdev->bus->self) != PCI_EXP_TYPE_PCI_BRIDGE) + pdev->dev_flags |= PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS; +} +/* ASM1083/1085, https://bugzilla.kernel.org/show_bug.cgi?id=44881#c46 */ +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ASMEDIA, 0x1080, + quirk_use_pcie_bridge_dma_alias); +/* Tundra 8113, https://bugzilla.kernel.org/show_bug.cgi?id=44881#c43 */ +DECLARE_PCI_FIXUP_HEADER(0x10e3, 0x8113, quirk_use_pcie_bridge_dma_alias); + static struct pci_dev *pci_func_0_dma_source(struct pci_dev *dev) { if (!PCI_FUNC(dev->devfn)) |