[Lima] [PATCH v3] drm/fourcc: add ARM GPU tile modifier

[Alyssa Rosenzweig]

> We don't know if this is a "category" per-se, or just a single Utgard
> tiling format - as discussed I'm trying to get an answer for that.

FWIW, as I think I mentioned on an message, this format is used on
Midgard as well, and presumably also Bifrost.

On Midgard, when a texture is uploaded (just as a plain bitmap), the
driver tiles it in this format and uploads that, to improve cache
locality.

That said, unlike on Lima/Utgard, Panfrost does not need this exposed in
kernel space, since I don't believe the format is renderable on Midgard.
Any time Qiang would need to import/export something in this tiled
format, I would just use AFBC for the same effect + bw savings.