[igt-dev] [PATCH i-g-t 6/9] lib/igt_fb: Fall back from gtt map to coherent map on platforms w/o aperture

[Chris Wilson]

Quoting Imre Deak (2020-01-29 18:15:58)
> Use a device coherent map instead of GGTT map on platforms w/o an
> aperture.

The decision tree here leads much to be desired. The usual practice is
to use sw detiling since that has been faster than HW since byt.
-Chris