From: Imre Deak imre.deak@intel.com
commit 873e5bb9fbd99e4a26c448b5c7af942a6d7aa60d upstream.
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 plugged with their peer device type set to 'none'.
Fixes: db1a07956968 ("drm/dp_mst: Handle SST-only branch device case") 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 Reviewed-by: Lyude Paul lyude@redhat.com Reported-by: Thiago Macieira gitlab@gitlab.freedesktop.org Link: https://patchwork.freedesktop.org/patch/msgid/20210201120145.350258-1-imre.d... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_dp_mst_topology.c | 1 + 1 file changed, 1 insertion(+)
--- 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_connec
switch (port->pdt) { case DP_PEER_DEVICE_NONE: + break; case DP_PEER_DEVICE_MST_BRANCHING: if (!port->mcs) ret = connector_status_connected;