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authorImre Deak <imre.deak@intel.com>2022-12-14 21:42:56 +0300
committerImre Deak <imre.deak@intel.com>2022-12-16 17:53:55 +0300
commit1d082618bbf3b6755b8cc68c0a8122af2842d593 (patch)
treec93bc8e7e31397e5fe522f1cad4682073baf76e8 /drivers/gpu/drm/display
parent8d784ba93d5f3b52d62fe23c08c3c8ea7b36d622 (diff)
downloadlinux-1d082618bbf3b6755b8cc68c0a8122af2842d593.tar.xz
drm/display/dp_mst: Fix down/up message handling after sink disconnect
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.deak@intel.com
Diffstat (limited to 'drivers/gpu/drm/display')
-rw-r--r--drivers/gpu/drm/display/drm_dp_mst_topology.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 51a46689cda7..90819fff2c9b 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -3641,6 +3641,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
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: