1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index dc7ac0c60547..5a99135d39cd 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3097,6 +3097,10 @@ static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
  * @port as needed. It is not OK however, to call this function and
  * drm_dp_atomic_release_vcpi_slots() in the same atomic check phase.
  *
+ * When &drm_atomic_state.duplicated is set to %true%, this function will not
+ * perform any error checking and will instead simply return the previously
+ * recorded VCPI allocations.
+ *
  * See also:
  * drm_dp_atomic_release_vcpi_slots()
  * drm_dp_mst_atomic_check()
@@ -3181,6 +3185,11 @@ EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
  * drm_dp_atomic_find_vcpi_slots() on the same @port in a single atomic check
  * phase.
  *
+ * When &drm_atomic_state.duplicated is set, this function will not
+ * modify the VCPI allocations in &drm_dp_mst_topology_state.vcpis, so that
+ * those VCPI allocations may be restored as-is from the duplicated state. In
+ * this scenario, this function will always return 0.
+ *
  * See also:
  * drm_dp_atomic_find_vcpi_slots()
  * drm_dp_mst_atomic_check()