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drm/amd/dm: Don't forget to attach MST encoders

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commit c9e0ab86b2 upstream.

The change fixed huge delay in SST daisy chain and S3 soft hang
observed in 4.19 kernel rebase.

Regression point in drm:
drm/fb-helper: Eliminate the .best_encoder() usage

The aux sequence is altered due to the failure in
drm_connector_for_each_possible_encoder(). The failure is
caused by missing attached encoder in the process of adding
MST connector.
 
drm_dp_send_enum_path_resources() aux transaction is pushed after
mode probe, which causes conflict to drm_dp_mst_i2c_xfer(),
leading to the transaction timeout.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lyude Paul
2018-11-19 15:00:10 +00:00
committed by Greg Kroah-Hartman
parent 94be4764b4
commit 8a8effbe56
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
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@@ -374,6 +374,8 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
master->connector_id);
aconnector->mst_encoder = dm_dp_create_fake_mst_encoder(master);
drm_connector_attach_encoder(&aconnector->base,
&aconnector->mst_encoder->base);
/*
* TODO: understand why this one is needed