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

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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>

...

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Lyude Paul 2018-11-19 15:00:10 +00:00 • committed by Alex Deucher

parent a5d0f45659

commit c9e0ab86b2

1 changed files with 2 additions and 0 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

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