Pushed, thanks! On Mon, 2020-01-06 at 18:21 +0800, Wayne Lin wrote: > [Why] > When change the connection status in a MST topology, mst device > which detect the event will send out CONNECTION_STATUS_NOTIFY messgae. > > e.g. src-mst-mst-sst => src-mst (unplug) mst-sst > > Currently, under the above case of unplugging device, ports which have > been allocated payloads and are no longer in the topology still occupy > time slots and recorded in proposed_vcpi[] of topology manager. > > If we don't clean up the proposed_vcpi[], when code flow goes to try to > update payload table by calling drm_dp_update_payload_part1(), we will > fail at checking port validation due to there are ports with proposed > time slots but no longer in the mst topology. As the result of that, we > will also stop updating the DPCD payload table of down stream port. > > [How] > While handling the CONNECTION_STATUS_NOTIFY message, add a detection to > see if the event indicates that a device is unplugged to an output port. > If the detection is true, then iterrate over all proposed_vcpi[] to > see whether a port of the proposed_vcpi[] is still in the topology or > not. If the port is invalid, set its num_slots to 0. > > Thereafter, when try to update payload table by calling > drm_dp_update_payload_part1(), we can successfully update the DPCD > payload table of down stream port and clear the proposed_vcpi[] to NULL. > > Changes since v1:(https://patchwork.kernel.org/patch/11275801/) > * Invert the conditional to reduce the indenting > > Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx> > Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 25 ++++++++++++++++++++++++- > 1 file changed, 24 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c > b/drivers/gpu/drm/drm_dp_mst_topology.c > index 6e10f6235009..e37cd6ec6e36 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -2321,7 +2321,7 @@ drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch > *mstb, > { > struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; > struct drm_dp_mst_port *port; > - int old_ddps, ret; > + int old_ddps, old_input, ret, i; > u8 new_pdt; > bool dowork = false, create_connector = false; > > @@ -2352,6 +2352,7 @@ drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch > *mstb, > } > > old_ddps = port->ddps; > + old_input = port->input; > port->input = conn_stat->input_port; > port->mcs = conn_stat->message_capability_status; > port->ldps = conn_stat->legacy_device_plug_status; > @@ -2376,6 +2377,28 @@ drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch > *mstb, > dowork = false; > } > > + if (!old_input && old_ddps != port->ddps && !port->ddps) { > + for (i = 0; i < mgr->max_payloads; i++) { > + struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; > + struct drm_dp_mst_port *port_validated; > + > + if (!vcpi) > + continue; > + > + port_validated = > + container_of(vcpi, struct drm_dp_mst_port, > vcpi); > + port_validated = > + drm_dp_mst_topology_get_port_validated(mgr, > port_validated); > + if (!port_validated) { > + mutex_lock(&mgr->payload_lock); > + vcpi->num_slots = 0; > + mutex_unlock(&mgr->payload_lock); > + } else { > + drm_dp_mst_topology_put_port(port_validated); > + } > + } > + } > + > if (port->connector) > drm_modeset_unlock(&mgr->base.lock); > else if (create_connector) -- Cheers, Lyude Paul _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
