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drm/amd/display: Set LTTPR mode to non-LTTPR if no repeaters found

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[WHY]
If no repeaters are found, we do not need or want to attempt to
link-train repeaters, as this could cause bugs.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Acked-by: Bindu Ramamurthy <bindur12@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wesley Chalmers 2021-03-30 18:15:21 -04:00 committed by Alex Deucher
parent b0f3438286
commit fab8580107
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@ -3582,6 +3582,8 @@ static bool retrieve_link_cap(struct dc_link *link)
link->dpcd_caps.lttpr_caps.revision.raw >= 0x14);
if (is_lttpr_present)
CONN_DATA_DETECT(link, lttpr_dpcd_data, sizeof(lttpr_dpcd_data), "LTTPR Caps: ");
else
link->lttpr_mode = LTTPR_MODE_NON_LTTPR;
}
if (!is_lttpr_present)