This gives drivers subclassing drm_dp_mst_topology_state the ability to
prepare their topology states for a new hub to be connected whenever
it's detected that the currently connected topology has been
disconnected from the system. We'll need this in order to correctly
track RX capabilities in i915 from the topology's atomic state.

Cc: Manasi Navare <manasi.d.nav...@intel.com>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Signed-off-by: Lyude Paul <ly...@redhat.com>

V7:
 - Fix CHECKPATCH errors
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 10 ++++++++++
 include/drm/drm_dp_mst_helper.h       |  3 ++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c 
b/drivers/gpu/drm/drm_dp_mst_topology.c
index fbd7888ebca8..981bd0f7d3ab 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2096,6 +2096,15 @@ static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
        return true;
 }
 
+static void drm_dp_mst_topology_reset_state(struct drm_dp_mst_topology_mgr 
*mgr)
+{
+       struct drm_dp_mst_topology_state *state =
+               to_dp_mst_topology_state(mgr->base.state);
+
+       if (mgr->cbs->reset_state)
+               mgr->cbs->reset_state(state);
+}
+
 /**
  * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
  * @mgr: manager to set state for
@@ -2171,6 +2180,7 @@ int drm_dp_mst_topology_mgr_set_mst(struct 
drm_dp_mst_topology_mgr *mgr, bool ms
                mgr->payload_mask = 0;
                set_bit(0, &mgr->payload_mask);
                mgr->vcpi_mask = 0;
+               drm_dp_mst_topology_reset_state(mgr);
        }
 
 out_unlock:
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index ad1aaec8d514..3a7378cd5bd1 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -381,6 +381,7 @@ struct drm_dp_sideband_msg_tx {
 
 /* sideband msg handler */
 struct drm_dp_mst_topology_mgr;
+struct drm_dp_mst_topology_state;
 struct drm_dp_mst_topology_cbs {
        /* create a connector for a port */
        struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr 
*mgr, struct drm_dp_mst_port *port, const char *path);
@@ -388,7 +389,7 @@ struct drm_dp_mst_topology_cbs {
        void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
                                  struct drm_connector *connector);
        void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
-
+       void (*reset_state)(struct drm_dp_mst_topology_state *state);
 };
 
 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
-- 
2.14.3

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