I was surprised that my BARTS in a Samsung notebook doesn't have a RADEON_IS_IGP flag.
Are there any DCE5 devices that are IGP?
Btw. who does set that "flags" anyway? Flags are passed to the radeon_driver_load_kms function from drm_pci.c: dev->driver->load(dev, ent->driver_data); (so driver_data becomes flags). But I can't find where that "driver_data" (AKA flags) is set.