This also needs to be squashed into the previous two patches. There's no point
in using drm_dp_atomic_find_vcpi_slots() or drm_dp_atomic_release_vcpi_slots()
without drm_dp_mst_atomic_check(), since the VCPI allocations setup by the two
functions aren't validated until then.
On Wed, 2019-09-18 at
From: Mikita Lipski
[why]
Validate mst topology and the number of VCPI slots available
for a new state. Fail if topology has no more bandwidth for
a new state.
[how]
Pass the atomic state to drm_dp_mst_atomic_check to verify
if the new topology is possible.
Cc: Lyude Paul
Signed-off-by: Mikita
