--- a/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts	2020-04-23 20:56:44.632005637 +0300
+++ b/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts	2020-04-23 21:13:32.642896736 +0300
@@ -555,6 +555,7 @@
 &pcie0 {
 	ep-gpios = <&gpio4 RK_PD1 GPIO_ACTIVE_HIGH>;
 	num-lanes = <4>;
+	max-link-speed = <2>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pcie_clkreqn_cpm>;
 	status = "okay";