drm/amd/display: Query DMCUB for dp alt status

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[Why]
To avoid hanging RDPCSPIPE when INTERCEPTB isn't set.

DMCUB owns control of that bit so DMCUB should manage returning the
information driver needs for link encoder control.

[How]
Add a new DMCUB command to return dp alt disable and dp4 information.

Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Nicholas Kazlauskas 2021-11-28 12:10:14 -05:00 • committed by Alex Deucher

parent 32b119c896

commit 41f91315b5

2 changed files with 88 additions and 38 deletions

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97

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

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29

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

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