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drm/amd/display: Correct vblank_end calc for fams cmd packet

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[Why]
By changing how we populate vblank_nom, constraining vblank size, the
vblank_end calculation for the fams command packet gets affected. We add
up v_active with a new vblank_nom value for stream pstate's nom_vtotal,
which describes the vtotal and nominal refresh rate, and that causes
underflow.

[How]
Set nom_vtotal equal to the timing's v_total.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Nicholas Carbones <Nicholas.Carbones@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:
Nicholas Carbones 2026-07-14 14:06:36 -04:00 committed by Alex Deucher
parent 86507b581f
commit b208e33f60
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c
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@ -1710,7 +1710,7 @@ static void build_pstate_meta_per_stream(struct dml2_pmo_instance *pmo,
/* common */
stream_pstate_meta->valid = true;
stream_pstate_meta->otg_vline_time_us = (double)timing->h_total / timing->pixel_clock_khz * 1000.0;
stream_pstate_meta->nom_vtotal = stream_descriptor->timing.vblank_nom + stream_descriptor->timing.v_active;
stream_pstate_meta->nom_vtotal = stream_descriptor->timing.v_total;
stream_pstate_meta->nom_refresh_rate_hz = timing->pixel_clock_khz * 1000.0 /
(stream_pstate_meta->nom_vtotal * timing->h_total);
stream_pstate_meta->nom_frame_time_us =