From: Marcos Del Sol Vives Date: Sat, 5 Jul 2025 23:32:08 +0000 (+0200) Subject: PCI: Disable MSI on RDC PCI to PCIe bridges X-Git-Tag: v6.12.58~373 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=59f223bace9fe8bd8dc800c3fea1dc6518a3f5ce;p=thirdparty%2Fkernel%2Fstable.git PCI: Disable MSI on RDC PCI to PCIe bridges [ 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 Signed-off-by: Bjorn Helgaas Link: https://patch.msgid.link/20250705233209.721507-1-marcos@orca.pet Signed-off-by: Sasha Levin --- diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index db609d26811ba..aa4733787cd7e 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2719,6 +2719,7 @@ 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