[Intel-gfx] [PATCH 0/6] Introduce DP MST Topology state

[Dhinakaran Pandiyan]

Link bandwidth is shared between multiple display streams in DP MST
configurations. The DP MST topology manager structure maintains the shared
link bandwidth for a primary link directly connected to the GPU. For atomic
modesetting drivers, checking if there is sufficient link bandwidth for a
mode needs to be done during the atomic_check phase to avoid failed
modesets.

This series adds dp_mst_topology_state to track available link bw for
atomic modesets and MST helpers to find and release link bw in terms of
vcpi time slots. Using the new helpers is optional and the changes should
not affect drivers that don't support atomic modesetting. I have made
changes to i915 to use the new helpers, but this should be applicable to
nouveau as well.

Patches 1-3/6 include cleanups and refactoring.
Patch 4/6 adds the MST topology state, 5/6 adds helpers to alter the state
and 6/6 contains i915 changes to use the helpers .

Dhinakaran Pandiyan (6):
  drm/dp: Store drm_device in MST topology manager
  drm/dp: Kill unused MST vcpi slot availability tracking
  drm/dp: Split drm_dp_mst_allocate_vcpi
  drm/dp: Introduce DP MST topology manager state to track DP link bw
  drm/dp: Add DP MST helpers to atomically find and release vcpi slots
  drm/i915/dp: Track available DP MST vcpi time slots

 drivers/gpu/drm/drm_atomic.c           | 66 +++++++++++++++++++++++++
 drivers/gpu/drm/drm_atomic_helper.c    | 10 ++++
 drivers/gpu/drm/drm_dp_mst_topology.c  | 89 ++++++++++++++++++++++++++--------
 drivers/gpu/drm/i915/intel_display.c   | 39 ++++++++++++++-
 drivers/gpu/drm/i915/intel_dp_mst.c    | 42 ++++++++++++++--
 drivers/gpu/drm/i915/intel_drv.h       |  3 ++
 drivers/gpu/drm/nouveau/nv50_display.c |  5 +-
 drivers/gpu/drm/radeon/radeon_dp_mst.c |  5 +-
 include/drm/drm_atomic.h               | 11 +++++
 include/drm/drm_dp_mst_helper.h        | 35 ++++++++-----
 10 files changed, 263 insertions(+), 42 deletions(-)

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2.7.4