The PCI device intterupt is routed to IRQ 0 in Jetson Xavier 5.10 kernel

[shinichiro.adachi]

We found that the same error occured in L4T 35.1.

Xavier not routing PCI interrupts across PEX8112 bridge

On a TX1 system with a PCIe to PCI bridge the PCI / interrupt configuration looks like this: TX1, running Ubuntu, with kernel version 4.4.38 Interrupt for the 8112 and the 2 DDC parts are all at #368 On Xavier the 8112 interrupt says IRQ38, and the 2 DDC devices are at IRQ0, which is wrong! This is lspci on a working Jetson-TK1. Notice that the interrupts are all assigned to IRQ 368: nvidia@tegra-ubuntu:~/DDC/acextremeSDK_4.0.1.3/samples$ lspci -vv 00:01.0 PCI bridge: NVIDIA Corporation De…

The PCI device intterupt is routed to IRQ 0.

0005:05:00.0 Multimedia controller: Contec Co., Ltd Device 8613
        Subsystem: Contec Co., Ltd Device 8613
        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 0
        Region 0: I/O ports at 101000 [disabled] [size=64]

It seems that pci_fixup_irqs() no longer exists in 5.10 kernel.

Could you please tell us how to fix it?

[WayneWWW]

Hi,

There is no plan to fix this from our side . It is a patch from upstream kernel.

https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2320789.html