drm/rockchip: vop: make vop register setting take effect

The setting of vop registers need a reg_done writing to take effect.
In vop_enable the vop return to work by by restoring registers, but the
registers do not take effect immediately, it should a vop_cfg_done
after it. The same thing is needed by windows_disabled in
vop_crtc_disable.
Signed-off-by: Chris Zhong <zyw@rock-chips.com>

drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -531,6 +531,8 @@ static int vop_enable(struct drm_crtc *crtc)
 	}
 
 	memcpy(vop->regs, vop->regsbak, vop->len);
+	vop_cfg_done(vop);
+
 	/*
 	 * At here, vop clock & iommu is enable, R/W vop regs would be safe.
 	 */
@@ -582,6 +584,8 @@ static void vop_crtc_disable(struct drm_crtc *crtc)
 		spin_unlock(&vop->reg_lock);
 	}
 
+	vop_cfg_done(vop);
+
 	drm_crtc_vblank_off(crtc);
 
 	/*