drm/amd/display: Not fallback if link BW is smaller than req BW

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[Why]
When the link BW is smaller than the request BW,
the DP LT just kept running and fallback to lower link config.
DP LT just aborted if is_hpd_pending bit is high.
But is_hpd_pending bit indicates a new HPD event received.
It doesn't mean the HPD is low.

[How]
Abort the DP LT if the link BW is smaller than the request BW.
Remove checking is_hpd_pending bit in DP LT.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Cruise <cruise.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Cruise 2024-05-11 14:42:14 +08:00 • committed by Alex Deucher

parent 79d92dbaf6

commit fa3c5a8edc

2 changed files with 4 additions and 17 deletions

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5

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c

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16

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_dpia.c

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