From: Imre Deak imre.deak@intel.com
commit 1d082618bbf3b6755b8cc68c0a8122af2842d593 upstream.
If the sink gets disconnected during receiving a multi-packet DP MST AUX down-reply/up-request sideband message, the state keeping track of which packets have been received already is not reset. This results in a failed sanity check for the subsequent message packet received after a sink is reconnected (due to the pending message not yet completed with an end-of-message-transfer packet), indicated by the
"sideband msg set header failed"
error.
Fix the above by resetting the up/down message reception state after a disconnect event.
Cc: Lyude Paul lyude@redhat.com Cc: stable@vger.kernel.org # v3.17+ Signed-off-by: Imre Deak imre.deak@intel.com Reviewed-by: Lyude Paul lyude@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20221214184258.2869417-1-imre.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3644,6 +3644,9 @@ int drm_dp_mst_topology_mgr_set_mst(stru drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); ret = 0; mgr->payload_id_table_cleared = false; + + memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv)); + memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv)); }
out_unlock: