https://bugzilla.kernel.org/show_bug.cgi?id=208891 --- Comment #32 from Mika Westerberg (mika.westerberg@xxxxxxxxxxxxxxx) --- Thanks for the logs. I think I know what is going on. From the failure log: Registers get saved: [ 80.292442] pci 0000:2d:00.0: saving config space at offset 0x1c (reading 0x101) [ 80.292446] pci 0000:2d:00.0: saving config space at offset 0x20 (reading 0x0) [ 80.292450] pci 0000:2d:00.0: saving config space at offset 0x24 (reading 0x10001) [ 80.292454] pci 0000:2d:00.0: saving config space at offset 0x28 (reading 0x0) [ 80.292458] pci 0000:2d:00.0: saving config space at offset 0x2c (reading 0x0) Resources are assigned: [ 80.293725] pci 0000:2d:00.0: BAR 8: assigned [mem 0x68000000-0x680fffff] [ 80.293727] pci 0000:2d:00.0: BAR 9: assigned [mem 0x6000000000-0x60000fffff 64bit pref] [ 80.293752] pci 0000:2d:00.0: BAR 7: assigned [io 0x5000-0x5fff] ... [ 80.293803] pci 0000:2d:00.0: PCI bridge to [bus 2e] [ 80.293807] pci 0000:2d:00.0: bridge window [io 0x5000-0x5fff] [ 80.293816] pci 0000:2d:00.0: bridge window [mem 0x68000000-0x680fffff] [ 80.293823] pci 0000:2d:00.0: bridge window [mem 0x6000000000-0x60000fffff 64bit pref] Note that there is no save happening here. Then shortly after there is register restore: [ 80.294748] pcieport 0000:2d:00.0: runtime IRQ mapping not provided by arch [ 80.294830] pcieport 0000:2d:00.0: restoring config space at offset 0x2c (was 0x60, writing 0x0) [ 80.294835] pcieport 0000:2d:00.0: restoring config space at offset 0x28 (was 0x60, writing 0x0) [ 80.294839] pcieport 0000:2d:00.0: restoring config space at offset 0x24 (was 0x10001, writing 0x10001) [ 80.294844] pcieport 0000:2d:00.0: restoring config space at offset 0x20 (was 0x68006800, writing 0x0) ^^^^^^^^^^ ^^^ [ 80.294848] pcieport 0000:2d:00.0: restoring config space at offset 0x1c (was 0x5151, writing 0x101) This ends up clearing the bridge window registers of 2d:00.0 downstream port. I guess this does not happen always because it is dependent on timing. -- You are receiving this mail because: You are watching the assignee of the bug.
