On Mon, Feb 22, 2021 at 12:00:27PM +0800, Wayne Lin wrote: > [Why & How] > According to DP spec, CLEAR_PAYLOAD_ID_TABLE is a path broadcast request > message and current implementation is incorrect. Fix it. > > Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 713ef3b42054..6d73559046e5 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -1072,6 +1072,7 @@ static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg) > > req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE; > drm_dp_encode_sideband_req(&req, msg); > + msg->path_msg = true; > } > > static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, > @@ -2722,7 +2723,8 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, > > req_type = txmsg->msg[0] & 0x7f; > if (req_type == DP_CONNECTION_STATUS_NOTIFY || > - req_type == DP_RESOURCE_STATUS_NOTIFY) > + req_type == DP_RESOURCE_STATUS_NOTIFY || > + req_type == DP_CLEAR_PAYLOAD_ID_TABLE) > hdr->broadcast = 1; Looks correct. Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Hmm. Looks like we're missing DP_POWER_DOWN_PHY and DP_POWER_UP_PHY here as well. We do try to send them as path requests, but apparently forget to mark them as broadcast messages. > else > hdr->broadcast = 0; > -- > 2.17.1 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Ville Syrjälä Intel
