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drm/amd/display: enforce UCLK pstate support in mode_support

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[Why]
mode_support does not require UCLK pstate today, so later PMO optimization
stages can push a plane's VActive latency-hiding margin below zero without
rechecking that the config still supports UCLK pstate. This can blank the
display on high-bandwidth configs.

[How]
Plumb the PMO-selected per-plane pstate method into mode_support and fail
the config only when UCLK pstate is required (method != na) but not
supported. For planes committed to a vactive method, require a non-negative
VActive latency-hiding margin, and skip the check when all streams are
blanked. No-op the PMO DCN42 pstate test (returning false only on the
initial candidate so the optimize/FAMS2 stage-3 setup still runs), since
reserved time is guaranteed by the override and the vactive margin is now
enforced in core mode_support.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Alexander Chechik <alexander.chechik@amd.com>
Signed-off-by: Matthew Stewart <matthew.stewart2@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alexander Chechik 2026-06-22 11:36:12 -04:00 • committed by Alex Deucher
commit 137b565595
3 changed files with 36 additions and 22 deletions
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