drm/amd/display: Add a TODO list

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TODOs

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1. Base this on drm-next - WIP

2. Cleanup commit history

3. WIP - Drop page flip helper and use DRM's version

4. DONE - Flatten all DC objects

    * dc_stream/core_stream/stream should just be dc_stream

    * Same for other DC objects

    "Is there any major reason to keep all those abstractions?

    Could you collapse everything into struct dc_stream?

    I haven't looked recently but I didn't get the impression there was a

    lot of design around what was public/protected, more whatever needed

    to be used by someone else was in public."

    ~ Dave Airlie

5. DONE - Rename DC objects to align more with DRM

    * dc_surface -> dc_plane_state

    * dc_stream -> dc_stream_state

6. DONE - Per-plane and per-stream validation

7. WIP - Per-plane and per-stream commit

8. WIP - Split pipe_ctx into plane and stream resource structs

9. Attach plane and stream reources to state object instead of validate_context

10. Remove dc_edid_caps and drm_helpers_parse_edid_caps

    * Use drm_display_info instead

    * Remove DC's edid quirks and rely on DRM's quirks (add quirks if needed)

    "Making sure you use the sink-specific helper libraries and kernel

    subsystems, since there's really no good reason to have 2nd

    implementation of those in the kernel. Looks likes that's done for mst

    and edid parsing. There's still a bit a midlayer feeling to the edid

    parsing side (e.g. dc_edid_caps and dm_helpers_parse_edid_caps, I

    think it'd be much better if you convert that over to reading stuff

    from drm_display_info and if needed, push stuff into the core). Also,

    I can't come up with a good reason why DC needs all this (except to

    reimplement half of our edid quirk table, which really isn't a good

    idea). Might be good if you put this onto the list of things to fix

    long-term, but imo not a blocker. Definitely make sure new stuff

    doesn't slip in (i.e. if you start adding edid quirks to DC instead of

    the drm core, refactoring to use the core edid stuff was pointless)."

    ~ Daniel Vetter

11. Remove existing i2c implementation from DC

    "Similar story for i2c, it uses the kernel's i2c code now, but there's

    still a full i2c implementation hidden beneath that in

    display/dc/i2caux. Kinda not cool, but imo ok if you fix that

    post-merging (perhaps by not including any of this in the linux DC

    code in the upstream kernel, but as an aux module in your internal

    codebase since there you probably need that, same applies to the edid

    parsing DC still does. For both cases I assume that the minimal shim

    you need on linux (bit banging and edid parsing isn't rocket since) is

    a lot less than the glue code to interface with the dc-provided

    abstraction."

    ~ Daniel Vetter

12. drm_modeset_lock in MST should no longer be needed in recent kernels

    * Adopt appropriate locking scheme