drm/amd/display: Enable IPS support for DCN4 Variant

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[Why]
DCN4 variant had IPS completely disabled via ips_support =
false and dc->config.disable_ips = DMUB_IPS_DISABLE_ALL.
Enabling IPS for D3 allows DMUB to manage idle power savings
when the display subsystem is inactive, reducing platform
power without affecting active display operation.

[How]
In DCN4 variant resource construct:
- Set dc->caps.ips_support = true
- Remove dc->config.disable_ips = DMUB_IPS_DISABLE_ALL override
This enables DMUB to dynamically manage IPS entry/exit during
D3 power state transitions. Also enable zstate by default.

Reviewed-by: Ovidiu (Ovi) Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Gabe Teeger <gabe.teeger@amd.com>
Signed-off-by: Matthew Stewart <matthew.stewart2@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Gabe Teeger 2026-06-08 15:39:04 -04:00 • committed by Alex Deucher

parent 4ef3723193

commit 6cefc59d36

1 changed files with 2 additions and 3 deletions

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drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c

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