diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index a48a3b5d2460..6275aa74da85 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -420,7 +420,7 @@ static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder,
 		DRM_DEV_DEBUG(dp->dev, "%s output to edp\n", name);
 	}
 
-	ret = rockchip_grf_field_write(dp->grf, &dp->data->lcdc_sel, ret);
+	ret = rockchip_grf_field_write(dp->grf, &dp->data->lcdc_sel, endpoint.id);
 	if (ret != 0)
 		DRM_DEV_ERROR(dp->dev, "Could not write to GRF reg lcdc_sel: %d\n", ret);
 }