From: Imre Deak <imre.deak@xxxxxxxxx>
[ Upstream commit 4b8878eefa0a3b65e2e016db49014ea66fb9fd45 ]
Caching EDIDs for physical ports prevents updating the EDID if a port
gets reconnected via a Connection Status Notification message, fix this.
Fixes: db1a07956968 ("drm/dp_mst: Handle SST-only branch device case")
Cc: Wayne Lin <Wayne.Lin@xxxxxxx>
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210201120145.350258-2-imre.deak@xxxxxxxxx
(cherry picked from commit 468091531c2e5c49f55d8c6f1d036ce997d24e13)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 17bdad95978a1..9cf35dab25273 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2302,7 +2302,8 @@ drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb,
}
if (port->pdt != DP_PEER_DEVICE_NONE &&
- drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
+ drm_dp_mst_is_end_device(port->pdt, port->mcs) &&
+ port->port_num >= DP_MST_LOGICAL_PORT_0) {
port->cached_edid = drm_get_edid(port->connector,
&port->aux.ddc);
drm_connector_set_tile_property(port->connector);
--
2.27.0
