diff options
| author |   Imre Deak <imre.deak@intel.com> | 2022-12-14 20:42:56 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 13:50:48 +0100 |
| commit | a579ed4613b5a64074963988ad481e43cf3b917b (patch) | |
| tree | ac24a5547bd695144d4a36152560a945bbc2694f | |
| parent | drm/display/dp_mst: Add drm_atomic_get_old_mst_topology_state() (diff) | |
| download | linux-stable-a579ed4613b5a64074963988ad481e43cf3b917b.tar.xz linux-stable-a579ed4613b5a64074963988ad481e43cf3b917b.zip | |
drm/display/dp_mst: Fix down/up message handling after sink disconnect
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.deak@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_mst_topology.c | 3 |
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 7e7364c69d9f..82d1473af2d9 100644 --- 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(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: |