Link bandwidth is a shared resource between multiple displays in DP MST
configurations. 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 when multiple CRTC's and
connectors are involved.
Managing shared resources like DP MST link bandwidth in the driver's
subclassed atomic_state will result in duplicating the code in each atomic
modesetting driver. But adding objects like DP MST link bandwidth to the
DRM core's drm_atomic_state would mean that an object that is not a core
modesetting object like connector, CRTC or a plane will be modified by the
helper functions for swapping and clearing state. So, this series
introduces void * type driver-private objects in drm_atomic_state and adds
helper functions that operate on these private objects. Drivers can then
implement object-specific functions to swap and clear states.
The advantage of having void * for these objects in drm_atomic_state is
that objects of different types can be managed in the same state array.
This rebased version includes a few minor changes -
1) Used for_each_oldnew_connector_in_state() macro (7/8)
2) Added a WARN_ON() to check for connection_mutex (5/8)
3) Alignment fix. (4/8)
Pandiyan, Dhinakaran (8):
drm/dp: Kill total_pbn and total_slots in struct
drm_dp_mst_topology_mgr
drm/dp: Kill unused MST vcpi slot availability tracking
drm/dp: Split drm_dp_mst_allocate_vcpi
drm: Add driver-private objects to atomic state
drm/dp: Introduce MST topology state to track available link bandwidth
drm/dp: Add DP MST helpers to atomically find and release vcpi slots
drm: Connector helper function to release resources
drm/dp: Track MST link bandwidth
drivers/gpu/drm/drm_atomic.c | 68 ++++++++++++
drivers/gpu/drm/drm_atomic_helper.c | 24 ++++
drivers/gpu/drm/drm_dp_mst_topology.c | 185 ++++++++++++++++++++++++++++---
drivers/gpu/drm/i915/intel_dp_mst.c | 42 +++++--
drivers/gpu/drm/nouveau/nv50_display.c | 3 +-
drivers/gpu/drm/radeon/radeon_dp_mst.c | 4 +-
include/drm/drm_atomic.h | 93 ++++++++++++++++
include/drm/drm_dp_mst_helper.h | 33 ++++--
include/drm/drm_modeset_helper_vtables.h | 13 +++
9 files changed, 427 insertions(+), 38 deletions(-)
--
2.7.4
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