drm/amd/display: Remove SDPIF_PORT_CONTROL programming for DCN31/35/42

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[why & how]
DCN IP team recommends SDPIF_PORT_CONTROL=0 as POR value for APUs.

The new POR value ensures that DCHUBBUB will not disconnect the SDP port to DF unless it explicitly
receives the pre_cstate_req signal. SDPIF_PORT_CONTROL=1 will only be used for IPS entry sequences,
where it will be restored to 0 upon IPS exit.

Reviewed-by: Leo Chen <leo.chen@amd.com>
Signed-off-by: Ovidiu Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Ovidiu Bunea 2026-08-28 16:07:55 -04:00 • committed by Alex Deucher

parent 8728be7e23

commit ad4ac1b342

3 changed files with 2 additions and 23 deletions

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5

drivers/gpu/drm/amd/display/dc/hubbub/dcn31/dcn31_hubbub.c

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7

drivers/gpu/drm/amd/display/dc/hubbub/dcn35/dcn35_hubbub.c

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13

drivers/gpu/drm/amd/display/dc/hubbub/dcn42/dcn42_hubbub.c

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