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drm/i915: Fix vblank evasion with vrr 

With vrr enabled the hardware no longer latches the registers
automagically at vblank start. The point at which it will do the
latching even when no push has been sent is the vmax decision
boundary. That is the thing we need to evade to avoid our
register latching to get split between two frames.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210122232647.22688-18-manasi.d.navare@intel.com
This commit is contained in:
Ville Syrjälä 2021-01-22 15:26:47 -08:00 committed by Manasi Navare
parent 7a2ec4a0a5
commit d6a059e2d3
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/display/intel_sprite.c
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@ -101,7 +101,10 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
if (new_crtc_state->uapi.async_flip)
return;
vblank_start = intel_mode_vblank_start(adjusted_mode);
if (new_crtc_state->vrr.enable)
vblank_start = intel_vrr_vmax_vblank_start(new_crtc_state);
else
vblank_start = intel_mode_vblank_start(adjusted_mode);
/* FIXME needs to be calibrated sensibly */
min = vblank_start - intel_usecs_to_scanlines(adjusted_mode,