drm/dp_mst: Add helper to trigger modeset on affected DSC MST CRTCs
authorMikita Lipski <mikita.lipski@amd.com>
Sat, 16 Nov 2019 18:32:15 +0000 (13:32 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 9 Jan 2020 23:07:48 +0000 (18:07 -0500)
commit8ec046716ca8ee79a9d2699f78511c08753c2e56
tree1dee73d20b2ba10cc241e524ba1a95c38ab88b6f
parent29b9ba74f6384a81594e479b3f1750868c72f356
drm/dp_mst: Add helper to trigger modeset on affected DSC MST CRTCs

[why]
Whenever a connector on an MST network is changed or
undergoes a modeset, the DSC configs for each stream on that
topology will be recalculated. This can change their required
bandwidth, requiring a full reprogramming, as though a modeset
was performed, even if that stream did not change timing.

[how]
Adding helper to trigger modesets on MST DSC connectors
by setting mode_changed flag on CRTCs in the same topology
as affected connector

v2: use drm_dp_mst_dsc_aux_for_port function to verify
if the port is DSC capable

v3: - added _must_check attribute
    - removed topology manager check
    - fix typos and indentations

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/drm_dp_mst_topology.c
include/drm/drm_dp_mst_helper.h