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drm/dp_mst: Don't report ports connected if nothing is attached to them

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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: db1a079569 ("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>
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.deak@intel.com
This commit is contained in:
Imre Deak 2021-02-01 14:01:42 +02:00
parent a7e02f7796
commit 873e5bb9fb
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/drm_dp_mst_topology.c
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@ -4212,6 +4212,7 @@ 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;