MST refcounting/atomic helpers cleanup

This is the series I've been working on for a while now to get all of the atomic DRM drivers in the tree to use the atomic MST helpers, and to make the atomic MST helpers actually idempotent. Turns out it's a lot more difficult to do that without also fixing how port and branch device refcounting works so that it actually makes sense, since the current upstream implementation requires a ton of magic in the atomic helpers to work around properly and in many situations just plain doesn't work as intended.

There's still more cleanup that can be done, but I think this is a good place to start off for now :).

This version just contains some changes that I forgot to make that had been requested much earlier, mainly in regards to the atomic checking code I added to i915 and nouveau (but not the helpers).

Also, per-request I've made a gitlab branch available for this:

https://gitlab.freedesktop.org/lyudess/linux/commits/wip/mst-dual-kref-start-v4

Lyude Paul (16):
drm/dp_mst: Rename drm_dp_mst_get_validated_(port|mstb)_ref and
friends
drm/dp_mst: Introduce new refcounting scheme for mstbs and ports drm/dp_mst: Restart last_connected_port_and_mstb() if topology ref
fails
drm/dp_mst: Stop releasing VCPI when removing ports from topology drm/dp_mst: Fix payload deallocation on hotplugs using malloc refs drm/i915: Keep malloc references to MST ports drm/amdgpu/display: Keep malloc ref to MST port drm/nouveau: Remove bogus cleanup in nv50_mstm_add_connector() drm/nouveau: Remove unnecessary VCPI checks in nv50_msto_cleanup() drm/nouveau: Keep malloc references to MST ports drm/nouveau: Stop unsetting mstc->port, use malloc refs drm/nouveau: Grab payload lock in nv50_msto_payload() drm/dp_mst: Add some atomic state iterator macros drm/dp_mst: Start tracking per-port VCPI allocations drm/dp_mst: Check payload count in drm_dp_mst_atomic_check() drm/nouveau: Use atomic VCPI helpers for MST

 .../gpu/dp-mst/topology-figure-1.dot          |  52 +
 .../gpu/dp-mst/topology-figure-2.dot          |  56 ++
 .../gpu/dp-mst/topology-figure-3.dot          |  59 ++
 Documentation/gpu/drm-kms-helpers.rst         |  26 +-
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  11 +-
 drivers/gpu/drm/drm_dp_mst_topology.c         | 938 ++++++++++++++----
 drivers/gpu/drm/i915/intel_connector.c        |   4 +
 drivers/gpu/drm/i915/intel_display.c          |   4 +
 drivers/gpu/drm/i915/intel_dp_mst.c           |  55 +-
 drivers/gpu/drm/nouveau/dispnv50/disp.c       |  96 +-
 include/drm/drm_dp_mst_helper.h               | 151 ++-
 11 files changed, 1203 insertions(+), 249 deletions(-)
 create mode 100644 Documentation/gpu/dp-mst/topology-figure-1.dot
 create mode 100644 Documentation/gpu/dp-mst/topology-figure-2.dot
 create mode 100644 Documentation/gpu/dp-mst/topology-figure-3.dot

2.20.1

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