Index: arch/arm/rockchip/rk_vop.c
===================================================================
RCS file: /cvsroot/src/sys/arch/arm/rockchip/rk_vop.c,v
retrieving revision 1.5
diff -p -u -r1.5 rk_vop.c
--- arch/arm/rockchip/rk_vop.c	17 Dec 2019 18:30:51 -0000	1.5
+++ arch/arm/rockchip/rk_vop.c	5 Jan 2020 12:11:41 -0000
@@ -265,6 +265,27 @@ static const struct drm_crtc_funcs rk_vo
 static void
 rk_vop_dpms(struct drm_crtc *crtc, int mode)
 {
+	struct rk_vop_crtc *mixer_crtc = to_rk_vop_crtc(crtc);
+	struct rk_vop_softc * const sc = mixer_crtc->sc;
+	uint32_t val;
+
+	val = RD4(sc, VOP_SYS_CTRL);
+
+	switch (mode) {
+	case DRM_MODE_DPMS_ON:
+		val &= ~VOP_STANDBY_EN;
+		break;
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
+	case DRM_MODE_DPMS_OFF:
+		val |= VOP_STANDBY_EN;
+		break;
+	}
+
+	WR4(sc, VOP_SYS_CTRL, val);
+
+	/* Commit settings */
+	WR4(sc, VOP_REG_CFG_DONE, REG_LOAD_EN);
 }
 
 static bool