Just missed most of this, but we do have drm_device_is_agp(dev) in the drm, only the CVS radeon uses this at present as the DDX can tell it also...
But on Linux it just does.. pci_find_capability(dev->pdev, PCI_CAP_ID_AGP);
which sounds like your chip says it is AGP but is connected over a PCI bus..
I tried that at Eric Anholt's suggestion, but, as you've guessed, it didn't work. What I ended up doing is looking that the device ID of the bus the card is connected to. If it matches the chip known to be used as the AGP-to-PCI bridge, I assume it's the PCI G450.
I have a patch. Could you review it?
https://bugs.freedesktop.org/show_bug.cgi?id=3248
also you could use postinit to do stuff from the driver and fail there... I don't mind adding a preinit if needed.. but I think postinit should be fine for your purposes... also at the moment the kernel is different than CVS, it doesn't take over the PCI device.. so drm_get_dev is called over the pciids... this shouldn't affect anything but if you were to modify the mga_drv.c:probe function it would cause issues...
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