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drm/i915: Calculate vblank delay more accurately

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Calculate the vblank delay in the vblank evasion code correctly
for interlaced modes.

The current code assumes that we won't be using an interlaced mode.
That assumption is actually valid since we've defeatured interlaced
scanout in commit f71c9b7bc3 ("drm/i915/display: Prune Interlace
modes for Display >=12") for DSB capable platforms. However the
feature is still present in the hardware, and if we ever find the
need to re-enable it seems better to calculate the vblank delay
correctly.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240624191032.27333-2-ville.syrjala@linux.intel.com
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
This commit is contained in:
Ville Syrjälä 2024-06-24 22:10:19 +03:00
parent 61fe488fc7
commit 3b0974d7b7
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/display/intel_vblank.c
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@ -652,7 +652,8 @@ void intel_vblank_evade_init(const struct intel_crtc_state *old_crtc_state,
*/
if (intel_color_uses_dsb(new_crtc_state) ||
new_crtc_state->update_m_n || new_crtc_state->update_lrr)
evade->min -= adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay;
evade->min -= intel_mode_vblank_start(adjusted_mode) -
intel_mode_vdisplay(adjusted_mode);
}
/* must be called with vblank interrupt already enabled! */