* [PATCH v2] arm64: dts: rockchip: Change ethernet TXD timing delay value
@ 2025-08-19 7:55 Dongjin Kim
2025-08-19 15:10 ` Chukun Pan
0 siblings, 1 reply; 3+ messages in thread
From: Dongjin Kim @ 2025-08-19 7:55 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Heiko Stuebner
Cc: devicetree, linux-arm-kernel, linux-rockchip, linux-kernel
Very poor network performance is observed on the ODROID-M1 Board
(REV 1.0 20220613) when running iperf3 (under 200Mbits/sec), and
this problem can be resolved after changing the value of TXD
timing to 0x35 from 0x4f.
Signed-off-by: Dongjin Kim <tobetter@gmail.com>
---
arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts b/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
index 0f844806ec542..e1a550a04498e 100644
--- a/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
@@ -210,7 +210,7 @@ &gmac0_rgmii_clk
&gmac0_rgmii_bus>;
status = "okay";
- tx_delay = <0x4f>;
+ tx_delay = <0x35>;
rx_delay = <0x2d>;
};
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] arm64: dts: rockchip: Change ethernet TXD timing delay value
2025-08-19 7:55 [PATCH v2] arm64: dts: rockchip: Change ethernet TXD timing delay value Dongjin Kim
@ 2025-08-19 15:10 ` Chukun Pan
2025-08-20 2:40 ` Dongjin Kim
0 siblings, 1 reply; 3+ messages in thread
From: Chukun Pan @ 2025-08-19 15:10 UTC (permalink / raw)
To: tobetter
Cc: conor+dt, devicetree, heiko, krzk+dt, linux-arm-kernel,
linux-kernel, linux-rockchip, robh, Chukun Pan
Hi,
> Very poor network performance is observed on the ODROID-M1 Board
> (REV 1.0 20220613) when running iperf3 (under 200Mbits/sec), and
> this problem can be resolved after changing the value of TXD
> timing to 0x35 from 0x4f.
Can you try changing phy-mode to "rgmii-id" ?
```
--- a/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
@@ -200,7 +200,7 @@ &gmac0 {
assigned-clock-rates = <0>, <125000000>;
clock_in_out = "output";
phy-handle = <&rgmii_phy0>;
- phy-mode = "rgmii";
+ phy-mode = "rgmii-id";
phy-supply = <&vcc3v3_sys>;
pinctrl-names = "default";
pinctrl-0 = <&gmac0_miim
@@ -209,9 +209,6 @@ &gmac0_rx_bus2
&gmac0_rgmii_clk
&gmac0_rgmii_bus>;
status = "okay";
-
- tx_delay = <0x4f>;
- rx_delay = <0x2d>;
};
&gpu {
```
--
2.25.1
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] arm64: dts: rockchip: Change ethernet TXD timing delay value
2025-08-19 15:10 ` Chukun Pan
@ 2025-08-20 2:40 ` Dongjin Kim
0 siblings, 0 replies; 3+ messages in thread
From: Dongjin Kim @ 2025-08-20 2:40 UTC (permalink / raw)
To: Chukun Pan
Cc: conor+dt, devicetree, heiko, krzk+dt, linux-arm-kernel,
linux-kernel, linux-rockchip, robh
On Tue, Aug 19, 2025 at 11:10:19PM +0800, Chukun Pan wrote:
> Hi,
>
> > Very poor network performance is observed on the ODROID-M1 Board
> > (REV 1.0 20220613) when running iperf3 (under 200Mbits/sec), and
> > this problem can be resolved after changing the value of TXD
> > timing to 0x35 from 0x4f.
>
> Can you try changing phy-mode to "rgmii-id" ?
>
> ```
> --- a/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts
> @@ -200,7 +200,7 @@ &gmac0 {
> assigned-clock-rates = <0>, <125000000>;
> clock_in_out = "output";
> phy-handle = <&rgmii_phy0>;
> - phy-mode = "rgmii";
> + phy-mode = "rgmii-id";
> phy-supply = <&vcc3v3_sys>;
> pinctrl-names = "default";
> pinctrl-0 = <&gmac0_miim
> @@ -209,9 +209,6 @@ &gmac0_rx_bus2
> &gmac0_rgmii_clk
> &gmac0_rgmii_bus>;
> status = "okay";
> -
> - tx_delay = <0x4f>;
> - rx_delay = <0x2d>;
> };
>
> &gpu {
> ```
>
> --
> 2.25.1
>
>
Thank you for suggesting me to try 'rgmii-id' again.
I'd remember that 'rgmii-id' didn't work with the very early version of
the board, however your suggestion works. Let me test the change with
more boards and submit the new patch when it's done.
Thanks a lot.
Dongjin Kim.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-08-19 7:55 [PATCH v2] arm64: dts: rockchip: Change ethernet TXD timing delay value Dongjin Kim
2025-08-19 15:10 ` Chukun Pan
2025-08-20 2:40 ` Dongjin Kim
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