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drm/i915/panel: Preserve Vtotal-Vsync distance while adjusting vtotal

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As we increase the vtotal to accommodate lower resfresh rate for fixed
modes, adjust the vtotal-vsync distance also.

v2: Rename vsync_*_diff to vsync_*_offset for clarity. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260609025325.1128543-3-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2026-06-09 08:23:25 +05:30
parent 485356a428
commit b28c1929d7
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/display/intel_panel.c
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@ -237,11 +237,18 @@ int intel_panel_compute_config(struct intel_connector *connector,
drm_mode_copy(adjusted_mode, fixed_mode);
if (is_vrr && fixed_mode_vrefresh != vrefresh)
if (is_vrr && fixed_mode_vrefresh != vrefresh) {
int vsync_start_offset = adjusted_mode->vtotal - adjusted_mode->vsync_start;
int vsync_end_offset = adjusted_mode->vtotal - adjusted_mode->vsync_end;
adjusted_mode->vtotal =
DIV_ROUND_CLOSEST(adjusted_mode->clock * 1000,
adjusted_mode->htotal * vrefresh);
adjusted_mode->vsync_start = adjusted_mode->vtotal - vsync_start_offset;
adjusted_mode->vsync_end = adjusted_mode->vtotal - vsync_end_offset;
}
drm_mode_set_crtcinfo(adjusted_mode, 0);
return 0;