drm/rockchip: vop: no need wait vblank on crtc enable

		return;

	}

	/*

	 * If dclk rate is zero, mean that scanout is stop,

	 * we don't need wait any more.

	 */

	if (clk_get_rate(vop->dclk)) {

		/*

		 * Rk3288 vop timing register is immediately, when configure

		 * display timing on display time, may cause tearing.

		 *

		 * Vop standby will take effect at end of current frame,

		 * if dsp hold valid irq happen, it means standby complete.

		 *

		 * mode set:

		 *    standby and wait complete --> |----

		 *                                  | display time

		 *                                  |----

		 *                                  |---> dsp hold irq

		 *     configure display timing --> |

		 *         standby exit             |

		 *                                  | new frame start.

		 */

		reinit_completion(&vop->dsp_hold_completion);

		vop_dsp_hold_valid_irq_enable(vop);

		spin_lock(&vop->reg_lock);

		VOP_REG_SET(vop, common, standby, 1);

		spin_unlock(&vop->reg_lock);

		wait_for_completion(&vop->dsp_hold_completion);

		vop_dsp_hold_valid_irq_disable(vop);

	}

	pin_pol = BIT(DCLK_INVERT);

	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) ?

		   BIT(HSYNC_POSITIVE) : 0;