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…

Please try with the following patch diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c index ec2e4a61aa4e..a72ba177a5fd 100644 --- a/drivers/pci/dwc/pcie-designware-host.c +++ b/drivers/pci/dwc/pcie-designware-host.c @@ -477,6 +477,8 @@ int dw_pcie_host_ini…

JetPack 4.2 git tag was tegra-l4t-r32.1 I added uio_pci_generic=m and re-compiled. Those devices work. Linux alphi-xavier 4.9.140-tegra #2 SMP PREEMPT Wed Jul 17 12:56:13 MST 2019 aarch64 aarch64 aarch64 GNU/Linux alphi@alphi-xavier:~$ lsb_release -a No LSB modules are available. Distributor I…

Yes, looks like it’s not routing PCI interrupts across the PEX8112 bridge.

So, is this more of your setup issue where you missed setting “uio_pci_generic=m” ??

No, the problem is “Xavier not routing PCI interrupts across PEX8112 bridge”. Me successfully building a .ko has nothing to do with it. I was just letting you know that this a compiled kernel with defconfig except for one line. From the git tag tegra-l4t-r32.1. Because you asked the question. On…

Did you happen to try the same kernel version on both Jetson-AGX and TX2 and it didn’t work on Jetson-AGX but worked on TX2? If so, that confirms that there is nothing wrong in the kernel sub-system at least. Unfortunately, we don’t have this kind of switch to repro the issue and looking at the cod…

I faced similar issue. Waiting for a good solution. Meanwhile searching the web.

Are legacy PCI interrupts supported on jetson Xavier?

Yes. Legacy interrupts are supported. To verify that, ‘pci=nomsi’ can be added to the kernel command line to let the kernel know that only Legacy interrupts need to be enabled.

Xavier not routing PCI interrupts across PEX8112 bridge

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier

BConklin July 31, 2019, 3:38pm 13

The PLX chips (now Broadcom) are the backbone of most computer PCI systems.
https://www.broadcom.com/products/pcie-switches-bridges/pcie-bridges/pex8112

This is the first time that I have put it into any kind of PCI system and had any issues.

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Xavier not routing PCI interrupts across PEX8112 bridge

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