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

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Message-ID: <dffd06a341b58e9689f578c3456cc11d@manjaro.org>
Date: Sun, 19 Jan 2025 12:36:52 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: Tianling Shen <cnsztl@...il.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, Jonas
 Karlman <jonas@...boo.se>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, Peter Geis
 <pgwipeout@...il.com>
Subject: Re: [PATCH] arm64: dts: rockchip: change eth phy mode to rgmii-id for
 orangepi r1 plus lts

On 2025-01-19 12:15, Tianling Shen wrote:
> On 2025/1/19 17:54, Dragan Simic wrote:
>> 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@...r.kernel.org # 6.6+
>>> Signed-off-by: Tianling Shen <cnsztl@...il.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

I see, but those values differ from the values found in the
"tx_delay" and "rx_delay" DT parameters, so I think this patch
should be tested with at least one more Orange Pi R1 Plus LTS
board, to make sure it's all still fine.

>> 
>>>      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";