[V7 31/45] drm/colorop: add BT2020/BT709 OETF and Inverse OETF

[Simon Ser]

> The BT.709 and BT.2020 OETFs are the same, the only difference
> being that the BT.2020 variant is defined with more precision
> for 10 and 12-bit per color encodings.

Just to make sure, the spec defines this precision, correct? It's
not an AMD-specific thing?

> Both are used as encoding functions for video content, and are
> therefore defined as OETF (opto-electronic transfer function)
> instead of as EOTF (electro-optical transfer function).

Ah, and IIRC the OETF is not the mathematical inverse of the EOTF,
right? So it makes sense to have separate entries for EOTF and OETF
and their mathematical inverses.

Again, I am no HDR expert.