[PATCH v2] drm/fourcc: add ARM GPU tile format

[Alyssa Rosenzweig]

> If you think Midgard/Bifrost is compatible with AFBC and don't have it's
> own format, and name "device" is improper,  I can rename
> DRM_FORMAT_MOD_ARM_DEVICE_AFBC to DRM_FORMAT_MOD_ARM_TYPE_AFBC
> DRM_FORMAT_MOD_ARM_DEVICE_GPU to DRM_FORMAT_MOD_ARM_TYPE_UTGARD

That name is misleading, too. Midgard/Bifrost is compatible with *both*
AFBC *and* tiled formats.

> Yes, lima need this when xserver/client share window buffer. Client may
> render into a tiled window buffer to be presented to xserver, so need a
> modifier to describe the buffer format. And Utgard can render into both
> tiled and linear buffers.

I see. I didn't realize Utgard could render into tiled formats; that's
nice :)