[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 #30 from Ilpo Järvinen (ilpo.jarvinen@linux.intel.com) ---
Justin, sure, my intention is to try to fix these issues now that we've becomes
aware of them. I'm just not sure if that can be done for pre-6.15 kernels as
touching the resource fitting / assignment algorithm is pretty precarious.

Steven, could you try with 6.15-rc based kernels with that min bridge window
patch + pci=realloc,min_bridge_window? Please also include the reset debugging
patch I just attached and dyndbg on the command line. There are number of
things in the 6.14 log I don't understand and I suspect I might have fixed at
least one of those in my recent changes to the resource fitting algorithm.

The failure to shrink bridge window size for 0000:22:02 from 0x500000 to
0x100000 as IOV resources should be optional, is particularly perplexing.
Instead, the non-64bit windows vanish from many bridges after bridge windows
are released, which could be due to improper reset of a resource after one of
the steps which the later steps fail to undo for some reason.

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