drm: Have the vblank counter account for the time between vblank irq disable and drm_vblank_off()
If the vblank irq has already been disabled (via the disable timer) when we call drm_vblank_off() sample the counter and timestamp one last time. This will make the sure that the user space visible counter will account for time between vblank irq disable and drm_vblank_off(). Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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