[Intel-gfx] [PATCH 08/12] drm/i915: Add NV12 support to intel_framebuffer_init

[Runyan, Arthur J]

>From: Konduru, Chandra
........
>> >
>> > Hi Daniel,
>> > NV12 programming is documented in bspec under display planes "Plane
>> > Planar YUV programming". There it talks about aux_dist which is the
>> > distance between y and uv planes expecting uv to be after y.
>>
>> Bspec talks about wrap-around, which at least indicates that this might be
>> possible and the hw doesn't have a real restriction here. Art, can you please
>> double-check whether we could wrape-around PLANE_AUX_DIST with a 2s
>> complement to avoid placement restrictions on the aux buffers?
>>
>> Bspec doesn't say anything about this being required to be positive ...
>> -Daniel
>
>Yeah, it isn't explicit, so to be sure a while ago checked with hw team about
>uv plane positioning relative to y-plane. It was confirmed that aux_dist to be
>positive. Certainly Art can double confirm for you.
>
Positive is correct.  We'll update the bspec to make it clear.