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PCI: Disable MSI on RDC PCI to PCIe bridges

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[ Upstream commit ebc7086b39e5e4f3d3ca82caaea20538c9b62d42 ]

RDC PCI to PCIe bridges, present on Vortex86DX3 and Vortex86EX2 SoCs, do
not support MSIs. If enabled, interrupts generated by PCIe devices never
reach the processor.

I have contacted the manufacturer (DM&P) and they confirmed that PCI MSIs
need to be disabled for them.

Signed-off-by: Marcos Del Sol Vives <marcos@orca.pet>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250705233209.721507-1-marcos@orca.pet
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marcos Del Sol Vives 2025-07-06 01:32:08 +02:00 • committed by Greg Kroah-Hartman
commit 72ee532421
1 changed files with 1 additions and 0 deletions
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1
drivers/pci/quirks.c
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@ -2541,6 +2541,7 @@ static void quirk_disable_msi(struct pci_dev *dev)
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, 0xa238, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x5a3f, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_RDC, 0x1031, quirk_disable_msi);
/*
* The APC bridge device in AMD 780 family northbridges has some random