From 03ea8676919af21b99bea01f18ef1a271d19f92f Mon Sep 17 00:00:00 2001 From: "Anton D. Stavinskii" Date: Wed, 26 Nov 2025 21:21:16 +0400 Subject: [PATCH] riscv: dts: sophgo: cv180x: fix USB dwc2 FIFO sizes I've tested the current dwc2 FIFO configuration and found that USB device mode breaks in ECM mode when transmitting frames larger than 128 bytes. For example, large ICMP packets or iperf3 traffic cause the USB link to hang and eventually disconnect without any messages in dmesg. After switching to more conservative FIFO sizes, ECM becomes stable and no longer drops the connection. iperf3 now shows ~130 Mbit/s RX and ~100 Mbit/s TX on SG2002 (MilkV Duo 256M). Fix the FIFO sizes accordingly. Signed-off-by: Anton D. Stavinskii Reviewed-by: Inochi Amaoto Fixes: e307248a3c2d ("riscv: dts: sophgo: Add USB support for cv18xx") Link: https://lore.kernel.org/r/20251126172115.1894190-2-stavinsky@gmail.com Signed-off-by: Inochi Amaoto Signed-off-by: Chen Wang Signed-off-by: Chen Wang --- arch/riscv/boot/dts/sophgo/cv180x.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/riscv/boot/dts/sophgo/cv180x.dtsi b/arch/riscv/boot/dts/sophgo/cv180x.dtsi index 1b2b1969a6484..06b0ce5a2db7a 100644 --- a/arch/riscv/boot/dts/sophgo/cv180x.dtsi +++ b/arch/riscv/boot/dts/sophgo/cv180x.dtsi @@ -438,8 +438,8 @@ clocks = <&clk CLK_AXI4_USB>, <&clk CLK_APB_USB>; clock-names = "otg", "utmi"; g-np-tx-fifo-size = <32>; - g-rx-fifo-size = <536>; - g-tx-fifo-size = <768 512 512 384 128 128>; + g-rx-fifo-size = <1536>; + g-tx-fifo-size = <128 128 64 64 64 64 32 32>; interrupts = ; phys = <&usbphy>; phy-names = "usb2-phy"; -- 2.47.3