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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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5
drivers/gpu/drm/amd/display/dc/resource/dcn42b/dcn42b_resource.c
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@ -1988,11 +1988,10 @@ static bool dcn42b_resource_construct(
dc->caps.dmcub_support = true;
dc->caps.is_apu = true;
dc->caps.seamless_odm = true;
dc->caps.zstate_support = false;
dc->caps.ips_support = false;
dc->caps.zstate_support = true;
dc->caps.ips_support = true;
dc->caps.max_v_total = (1 << 15) - 1;
dc->caps.vtotal_limited_by_fp2 = true;
dc->config.disable_ips = DMUB_IPS_DISABLE_ALL;
/* Color pipeline capabilities */
dc->caps.color.dpp.dcn_arch = 1;