drm/amd/display: Poll pending DOWN_REP before enabling the link
authorMartin Tsai <martin.tsai@amd.com>
Mon, 11 Feb 2019 07:26:21 +0000 (15:26 +0800)
committerAlex Deucher <alexander.deucher@amd.com>
Tue, 19 Mar 2019 20:04:02 +0000 (15:04 -0500)
commit9cc032b239399a43290bb203b399d0ab3ec81e27
tree29888f4c144926b1f1aa9ff091c1ed63329ca4c9
parent55c374e9eb72be0de5d4fe2ef4d7803cd4ea6329
drm/amd/display: Poll pending DOWN_REP before enabling the link

[Why]
With special monitor combination on MST, the UP_REQ could come
after clear payload table. It makes the pending DOWN_REP fail
to be handled after link training and the new DOWN_REQ will be queued
until time out .

[How]
To move the current polling pending DOWN_REP procedure to after
clear payload table to make sure the pending DOWN_REP can be
done before enabling the link.

Signed-off-by: Martin Tsai <martin.tsai@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
drivers/gpu/drm/amd/display/dc/core/dc_link.c
drivers/gpu/drm/amd/display/dc/dm_helpers.h