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
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@ -3641,6 +3641,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
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drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
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drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
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ret = 0;
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ret = 0;
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mgr->payload_id_table_cleared = false;
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mgr->payload_id_table_cleared = false;
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memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv));
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memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv));
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}
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}
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out_unlock:
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out_unlock:
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