Re: [PATCH] drm/amd/amdgpu: add firmware file fallback for APU VBIOS discovery

[Arnaud BERTRAND]

Hello,

I have two dGPUs : a Radeon RX 6800
XT and a Radeon RX 6800. They both report the same PCI identity
1002:73bf and each has a different VBIOS.
I hit the same VFCT bus-number mismatch on 7.2.10, but with a different
outcome: on my machine the device-identity fallback actively breaks the second
dGPU.
I patched my kernel to remove the fallback, but I would like to have a
better solution for my use case.
Would it be possible to apply the patch only to APUs ? That would keep
Oz's APU case working but a dGPU with a stale bus number would fall
through to its own ROM, which is the source that is
guaranteed to match the card in the slot.
I can provide more details if needed, I am out of my depth here.
Thanks
Arnaud