Reporting a port as connected if nothing is attached to them leads to any i2c transactions on this port trying to use an uninitialized i2c adapter, fix this.
Let's account for this case even if branch devices have no good reason to report a port as unplugged with their peer device type set to 'none'.
Fixes: db1a07956968 ("drm/dp_mst: Handle SST-only branch device case") References: https://gitlab.freedesktop.org/drm/intel/-/issues/2987 References: https://gitlab.freedesktop.org/drm/intel/-/issues/1963 Cc: Wayne Lin Wayne.Lin@amd.com Cc: Lyude Paul lyude@redhat.com Cc: stable@vger.kernel.org # v5.5+ Cc: intel-gfx@lists.freedesktop.org Signed-off-by: Imre Deak imre.deak@intel.com --- drivers/gpu/drm/drm_dp_mst_topology.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index e82b596d646c..deb7995f42fa 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -4224,6 +4224,7 @@ drm_dp_mst_detect_port(struct drm_connector *connector,
switch (port->pdt) { case DP_PEER_DEVICE_NONE: + break; case DP_PEER_DEVICE_MST_BRANCHING: if (!port->mcs) ret = connector_status_connected;