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drm/amd/display: Decide zstate_support based off Z8 global support

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[why & how]
DC incorrectly reports ZStates NOT supported for eDP panels without
support for PSR or Replay. This is because the zstate_support flag is
populated with supported_in_blank, which is not the correct
interpretation.

Z8 can be entered for a plane when its Z8 stutter enter plus exit time
is covered either during vblank (reserved vblank time is greater than
SREnterPlusExitZ8Time) or during vactive (active clock change latency
hiding minus the Z8StutterEnterPlusExitWatermark is positive). Compute
this per plane in CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport(),
and report Z8 as supported only when every non-phantom plane satisfies
at least one of these two cases. Populate z8_stutter.global_support in
mode programming and use it to populate zstate_support.

Assisted-by: Claude:claude-Opus-4.8
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Ovidiu Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@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 2026-07-28 23:39:53 -04:00 • committed by Alex Deucher
commit c3abe2366e
6 changed files with 24 additions and 1 deletions
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