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drm/amd/display: Fix link training fallback logic

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[Why]
Link training should fail if stream bandwidth exceeds link bandwidth.

[How]
Correct fallback logic and use named variables to make intention clear.

Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jimmy Kizito
2021-08-25 19:12:08 -04:00
committed by Alex Deucher
parent 4b7786d87f
commit 4de0bfe67b
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@@ -2462,12 +2462,16 @@ bool perform_link_training_with_retries(
if (type == dc_connection_none)
break;
} else if (do_fallback) {
uint32_t req_bw;
uint32_t link_bw;
decide_fallback_link_setting(*link_setting, &current_setting, status);
/* Fail link training if reduced link bandwidth no longer meets
* stream requirements.
*/
if (dc_bandwidth_in_kbps_from_timing(&stream->timing) <
dc_link_bandwidth_kbps(link, &current_setting))
req_bw = dc_bandwidth_in_kbps_from_timing(&stream->timing);
link_bw = dc_link_bandwidth_kbps(link, &current_setting);
if (req_bw > link_bw)
break;
}