drm/amd/display: Fix DIG_HPD_SELECT for USB4 display endpoints.

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[Why]
DIB_BE_CNTL<i>.DIG_HPD_SELECT selects the HPD block being used
by the display endpoint assigned to DIG<i>. In the case of USB4
display endpoints, no physical HPD block is assigned.

[How]
Setting DIB_BE_CNTL<i>.DIG_HPD_SELECT to 5 indicates that no HPD
is assigned to a display endpoint. Firmware decrements the
HPD_SELECT value by 1 before writing it to the register.

Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Jimmy Kizito 2021-08-23 17:23:24 -04:00 • committed by Alex Deucher

parent 88f52b1fff

commit 8cf5ed4a15

1 changed files with 9 additions and 3 deletions

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drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dio_link_encoder.c

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