[Bug 220016] USB devices plugged into USB hubs on 6.14.2-300.fc42.x86_64 do not work

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220016

--- Comment #24 from Ilpo Järvinen (ilpo.jarvinen@linux.intel.com) ---
Created attachment 308020
  --> https://bugzilla.kernel.org/attachment.cgi?id=308020&action=edit
Add min_bridge_window cmdline parameter

It seems the FW left zero extra tail room in the root iomem windows which makes
it a bit hard for pci=realloc to work. It doesn't work well with the default
sizing algorithm that is greedy and tries to reserves more space than is really
required.

Maybe the attached patch helps more devices to assign their resources:

So please test with pci=realloc,min_bridge_window

It could still leads to a failure or some failures because it seems there
simply is not enough space to fit everything even without pci=realloc reserving
that extra empty space.

Please also add dyndbg="file drivers/pci/*.c +p" on kernel cmdline to get a bit
more information.

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