Hi, On Fri, Jul 29, 2022 at 11:40:22AM +0200, Łukasz Bartosik wrote: > A thunderbolt > lspci -d 8086:9a1b -vmmknn > Slot: 00:0d.2 > Class: System peripheral [0880] > Vendor: Intel Corporation [8086] > Device: Tiger Lake-LP Thunderbolt 4 NHI #0 [9a1b] > > presents itself with PCI class 0x088000 after Chromebook boots. > lspci -s 00:0d.2 -xxx > 00:0d.2 System peripheral: Intel Corporation Tiger Lake-LP Thunderbolt 4 > NHI #0 (rev 01) > 00: 86 80 1b 9a 00 00 10 00 01 00 80 08 00 00 00 00 > ... > > However after thunderbolt is powered up in nhi_probe() > its class changes to 0x0c0340 > lspci -s 00:0d.2 -xxx > 00:0d.2 System peripheral: Intel Corporation Tiger Lake-LP Thunderbolt 4 > NHI #0 (rev 01) > 00: 86 80 1b 9a 06 04 10 00 01 40 03 0c 00 00 00 00 > ... > > which leaves pci_dev structure with old class value > cat /sys/bus/pci/devices/0000:00:0d.2/class > 0x088000 This is completely unexpected. Which Chromebook this is and have you tried to upgrade it to the latest? > This fix updates PCI device class in pci_dev structure after > thunderbolt is powered up. I think we need to understand why this happens in the first place before doing anything else.
