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drm/i915/vrr: Fix "window2" handling

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The "window2" delay is just the difference of vactive
(undelayed vblank) vs. vblank_start (delayed vblank).
Just use vblank_start during the VRR calculations so
that things work correctly regardless of whether delayed
vblank is used or not.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230127173044.24108-2-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
This commit is contained in:
Ville Syrjälä
2023-01-27 19:30:41 +02:00
parent fe82b93fc1
commit d34b4288bd
1 changed files with 2 additions and 8 deletions
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10
drivers/gpu/drm/i915/display/intel_vrr.c
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@@ -144,17 +144,11 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
* is deprecated.
*/
if (DISPLAY_VER(i915) >= 13) {
/*
* FIXME: Subtract Window2 delay from below value.
*
* Window2 specifies time required to program DSB (Window2) in
* number of scan lines. Assuming 0 for no DSB.
*/
crtc_state->vrr.guardband =
crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vdisplay;
crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vblank_start;
} else {
crtc_state->vrr.pipeline_full =
min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay -
min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vblank_start -
crtc_state->framestart_delay - 1);
}