RADEON_OV0_SOFT_EOF_TOGGLE
si->overlay_mgr.auto_flip_reg ^= RADEON_OV0_SOFT_EOF_TOGGLE;
si->overlay_mgr.auto_flip_reg ^= RADEON_OV0_SOFT_EOF_TOGGLE;
si->overlay_mgr.auto_flip_reg ^= RADEON_OV0_SOFT_EOF_TOGGLE;
si->overlay_mgr.auto_flip_reg ^= RADEON_OV0_SOFT_EOF_TOGGLE;