drm/amd/display: Workaround for some legacy DP-VGA dongles

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[Why]
Maximum resolution is 1440*900 when connecting to FHD monitor via some DP-VGA
dongles. The display EDID reading fails over AUX/I2C via DP->VGA dongle, and
this leads to the maximum resolution 1920*1080 cannot be obtained from EDID.

[How]
Provide a workaround for some legacy DP-VGA dongles with a longer aux delay.

Signed-off-by: Taimur Hassan <syed.hassan@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Taimur Hassan 2021-01-15 17:34:34 -05:00 • committed by Alex Deucher

parent c64b0d6bb5

commit fd952d4364

1 changed files with 12 additions and 1 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c

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