[PATCH v4 0/5] drm/atomic: Add accessor macros for all atomic state.

[Maarten Lankhorst]

Fifth iteration. Instead of trying to convert all drivers straight away,
implement all macros that are required to get state working.

Old situation:
Use obj->state, which can refer to old or new state.
Use drm_atomic_get_(existing_)obj_state, which can refer to new or old state.
Use for_each_obj_in_state, which refers to new or old state.

New situation:

During atomic check:
- Use drm_atomic_get_obj_state to add a object to the atomic state,
  or get the new state.
- Use drm_atomic_get_(old/new)_obj_state to peek at the new/old state,
  without adding the object. This will return NULL if the object is
  not part of the state. For planes and connectors the relevant crtc_state
  is added, so this will work to get the crtc_state from obj_state->crtc
  too, this means not having to write some error handling. 

During atomic commit:
- Do not use drm_atomic_get_obj_state, obj->state or drm_atomic_get_(existing_)obj_state
  any more, replace with drm_atomic_get_old/new_obj_state calls as required.

During both:
- Use for_each_(new,old,oldnew)_obj_in_state to get the old or new state as needed.
  oldnew will be renamed to for_each_obj_in_state after all callers are converted
  to the new api.

When not doing atomic updates:
Look at obj->state for now. I have some patches to fix this but I was asked to
make it return a const state. This breaks a lot of users though so I skipped that
patch in this iteration.

This series will return the correct state regardless of swapping.

Maarten Lankhorst (5):
  drm/atomic: Fix atomic helpers to use the new iterator macros, v2.
  drm/atomic: Make drm_atomic_plane_disabling easier to understand.
  drm/atomic: Add macros to access existing old/new state, v2.
  drm/atomic: Convert get_existing_state callers to get_old/new_state,
    v3.
  drm/blend: Use new atomic iterator macros.

 drivers/gpu/drm/drm_atomic.c            |   6 +-
 drivers/gpu/drm/drm_atomic_helper.c     | 469 ++++++++++++++++----------------
 drivers/gpu/drm/drm_blend.c             |  23 +-
 drivers/gpu/drm/drm_plane_helper.c      |   2 +-
 drivers/gpu/drm/drm_simple_kms_helper.c |   4 +-
 include/drm/drm_atomic.h                | 108 ++++++++
 include/drm/drm_atomic_helper.h         |  26 +-
 7 files changed, 375 insertions(+), 263 deletions(-)

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2.7.4