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drm/amd/display: avoid link loss short pulse stuck the system

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[Why]
MST monitor sends link loss short pulse continuous but sink is
occupy by HDMI input to lead link training fail.

[How]
disable link once retraining fail.

Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Yu-ting Shen <yu-tshen@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yu-ting Shen 2021-10-19 14:22:02 +08:00 committed by Alex Deucher
parent 670d2a6240
commit bca5bea403
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@ -4279,6 +4279,8 @@ void core_link_enable_stream(
*/
if (status != DC_FAIL_DP_LINK_TRAINING ||
pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
if (false == stream->link->link_status.link_active)
disable_link(stream->link, pipe_ctx->stream->signal);
BREAK_TO_DEBUGGER();
return;
}