Without fifo depths attempting to change the MTU will fail. These values are from the RK3328 Technical Reference Manual, gmac2io interface tested with Rock64. Signed-off-by: shironeko <shironeko@xxxxxxxxxxxxx> --- v2: added depths for gmac2phy as well arch/arm64/boot/dts/rockchip/rk3328.dtsi | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi index e729e7a22b23..06af280083ae 100644 --- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi @@ -916,6 +916,8 @@ gmac2io: ethernet@ff540000 { resets = <&cru SRST_GMAC2IO_A>; reset-names = "stmmaceth"; rockchip,grf = <&grf>; + tx-fifo-depth = <2048>; + rx-fifo-depth = <4096>; snps,txpbl = <0x4>; status = "disabled"; }; @@ -938,6 +940,8 @@ gmac2phy: ethernet@ff550000 { reset-names = "stmmaceth"; phy-mode = "rmii"; phy-handle = <&phy>; + tx-fifo-depth = <2048>; + rx-fifo-depth = <4096>; snps,txpbl = <0x4>; clock_in_out = "output"; status = "disabled"; -- 2.42.1