Re: [PATCH] arm64: dts: rockchip: change eth phy mode to rgmii-id for orangepi r1 plus lts

Tianling Shen
2025-01-19T11:17:37Z

Hi Dragan,

On 2025/1/19 17:54, Dragan Simic wrote:
> Hello Tianling,
>
> Thanks for the patch.  Please, see a comment below.
>
> On 2025-01-19 10:11, Tianling Shen wrote:
>> In general the delay should be added by the PHY instead of the MAC,
>> and this improves network stability on some boards which seem to
>> need different delay.
>>
>> Fixes: 387b3bbac5ea ("arm64: dts: rockchip: Add Xunlong OrangePi R1
>> Plus LTS")
>> Cc: stable@vger.kernel.org # 6.6+
>> Signed-off-by: Tianling Shen <cnsztl@gmail.com>
>> ---
>>  arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts | 3 +--
>>  arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts     | 1 +
>>  arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi    | 1 -
>>  3 files changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git
>> a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
>> b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
>> index 67c246ad8b8c..ec2ce894da1f 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
>> +++ b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus-lts.dts
>> @@ -17,8 +17,7 @@ / {
>>
>>  &gmac2io {
>>      phy-handle = <&yt8531c>;
>> -    tx_delay = <0x19>;
>> -    rx_delay = <0x05>;
>> +    phy-mode = "rgmii-id";
>
> Shouldn't the "tx_delay" and "rx_delay" DT parameters be converted
> into the "tx-internal-delay-ps" and "rx-internal-delay-ps" parameters,
> respectively, so the Motorcomm PHY driver can pick them up and
> actually configure the internal PHY delays?

The documentation[1] says "{t,r}x-internal-delay-ps" default to 1950 and
that value already works fine on my board.

1.
https://www.kernel.org/doc/Documentation/devicetree/bindings/net/motorcomm%2Cyt8xxx.yaml

Thanks,
Tianling.

>
>>      status = "okay";
>>
>>      mdio {
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
>> b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
>> index 324a8e951f7e..846b931e16d2 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
>> +++ b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dts
>> @@ -15,6 +15,7 @@ / {
>>
>>  &gmac2io {
>>      phy-handle = <&rtl8211e>;
>> +    phy-mode = "rgmii";
>>      tx_delay = <0x24>;
>>      rx_delay = <0x18>;
>>      status = "okay";
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
>> b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
>> index 4f193704e5dc..09508e324a28 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
>> +++ b/arch/arm64/boot/dts/rockchip/rk3328-orangepi-r1-plus.dtsi
>> @@ -109,7 +109,6 @@ &gmac2io {
>>      assigned-clocks = <&cru SCLK_MAC2IO>, <&cru SCLK_MAC2IO_EXT>;
>>      assigned-clock-parents = <&gmac_clk>, <&gmac_clk>;
>>      clock_in_out = "input";
>> -    phy-mode = "rgmii";
>>      phy-supply = <&vcc_io>;
>>      pinctrl-0 = <&rgmiim1_pins>;
>>      pinctrl-names = "default";