drm/todo: Tick off some tinydrm entries

Contact: Daniel Vetter, respective driver maintainers

Better manual-upload support for atomic

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This would be especially useful for tinydrm:

- Add a struct drm_rect dirty_clip to drm_crtc_state. When duplicating the

  crtc state, clear that to the max values, x/y = 0 and w/h = MAX_INT, in

  __drm_atomic_helper_crtc_duplicate_state().

- Move tinydrm_merge_clips into drm_framebuffer.c, dropping the tinydrm\_

  prefix ofc and using drm_fb\_. drm_framebuffer.c makes sense since this

  is a function useful to implement the fb->dirty function.

- Create a new drm_fb_dirty function which does essentially what e.g.

  mipi_dbi_fb_dirty does. You can use e.g. drm_atomic_helper_update_plane as the

  template. But instead of doing a simple full-screen plane update, this new

  helper also sets crtc_state->dirty_clip to the right coordinates. And of

  course it needs to check whether the fb is actually active (and maybe where),

  so there's some book-keeping involved. There's also some good fun involved in

  scaling things appropriately. For that case we might simply give up and

  declare the entire area covered by the plane as dirty.

Contact: Noralf Trønnes, Daniel Vetter

Fallout from atomic KMS

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  one of the ideas for having a shared dsi/dbi helper, abstracting away the

  transport details more.

- tinydrm_gem_cma_prime_import_sg_table should probably go into the cma

  helpers, as a _vmapped variant (since not every driver needs the vmap).

  And tinydrm_gem_cma_free_object could the be merged into

  drm_gem_cma_free_object().

- tinydrm_fb_create we could move into drm_simple_pipe, only need to add

  the fb_create hook to drm_simple_pipe_funcs, which would again simplify a

  bunch of things (since it gives you a one-stop vfunc for simple drivers).

- Quick aside: The unregister devm stuff is kinda getting the lifetimes of

  a drm_device wrong. Doesn't matter, since everyone else gets it wrong

  too :-)

- also rework the drm_framebuffer_funcs->dirty hook wire-up, see above.

Contact: Noralf Trønnes, Daniel Vetter

AMD DC Display Driver