[PATCH] drm/amdgpu/dc: Pixel encoding DRM property and module parameter

[James Ettle]

On Mon, 2020-09-28 at 16:12 -0400, Kazlauskas, Nicholas wrote:
> 
> The problem with the module parameters is that it'd be applying a 
> default to every DRM connector. No way to specify different defaults
> per 
> DRM connector, nor do we know the full connector set at driver 
> initialization. The list is dynamic and can change when you
> plug/unplug 
> MST displays.

I just want to point out that the module parameter does support
connector-specific values, e.g.

  amdgpu.pixel_encoding=HDMI-A-1:rgb

should only affect the connector named HDMI-A-1 (unless I've coded it
wrong -- I don't have enough video ports to test it thoroughly). If
there's no such-named connector the parameter should be ignored. In
contrast with no named connector given, e.g.

  amdgpu.pixel_encoding=rgb

should match any connector. Multiple connectors can be given comma-
separated. I admit the solution here is crude -- it just stores the
string and rescans it when required.

-James