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drm/amd/display: Only update link settings after successful MST link train

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[WHY]
Currently driver reduces verified link caps on DPIA devices if a link is
trained at a link rate below the max rate verified during link detection.
This blocks high bandwidth modes after setting a low bandwidth mode.

[HOW]
Only update link rate after a successful link train if link is MST.

Reviewed-by: Mustapha Ghaddar <Mustapha.Ghaddar@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michael Strauss
2022-10-20 15:57:36 -04:00
committed by Alex Deucher
parent 1df6b9b07e
commit ea192af507
4 changed files with 22 additions and 2 deletions
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5
drivers/gpu/drm/amd/display/dc/dm_helpers.h
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@@ -116,6 +116,11 @@ bool dm_helpers_dp_mst_start_top_mgr(
bool dm_helpers_dp_mst_stop_top_mgr(
struct dc_context *ctx,
struct dc_link *link);
void dm_helpers_dp_mst_update_branch_bandwidth(
struct dc_context *ctx,
struct dc_link *link);
/**
* OS specific aux read callback.
*/