This is the first version of my patch series to implement MST fallback retraining in i915, along with improving the stability of i915's mst retraining in general. Additionally, it also introduces helpers into DRM to help with correctly handling MST fallback retraining so that other drivers may also implement it. If your driver has a homegrown implementation of this, you should convert it to these helpers to ensure that the behavior of atomic commits and connector's link status properties in the event of requiring retraining on an MST topology remains consistent between DRM drivers.
Additionally, this lets me use the DisplayPort on my dock so I can finally free up the thunderbolt 3 connector on it for more useful things. At long last :).
Cc: Manasi Navare manasi.d.navare@intel.com Cc: Ville Syrjälä ville.syrjala@linux.intel.com
Lyude Paul (6): drm/i915: Remove unused DP_LINK_CHECK_TIMEOUT drm/i915: Move DP modeset retry work into intel_dp drm/i915: Only use one link bw config for MST topologies drm/dp_mst: Add drm_dp_mst_topology_mgr_lower_link_rate() drm/dp_mst: Add drm_atomic_dp_mst_retrain_topology() drm/i915: Implement proper fallback training for MST
drivers/gpu/drm/drm_dp_mst_topology.c | 296 ++++++++++++++++++++- drivers/gpu/drm/i915/intel_display.c | 23 +- drivers/gpu/drm/i915/intel_dp.c | 360 +++++++++++++++++++------- drivers/gpu/drm/i915/intel_dp_link_training.c | 2 +- drivers/gpu/drm/i915/intel_dp_mst.c | 64 +++-- drivers/gpu/drm/i915/intel_drv.h | 23 +- include/drm/drm_dp_mst_helper.h | 5 + 7 files changed, 662 insertions(+), 111 deletions(-)