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Message-Id: <5285B176-5178-4F6F-8FB6-B898AC0EC939@tahomasoft.com>
Date: Sat, 30 Aug 2025 18:21:18 -0400
From: Erik Beck <xunil@...omasoft.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Chukun Pan <amadeus@....edu.cn>, Heiko Stuebner <heiko@...ech.de>,
Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: rockchip: Add HINLINK H68K
> On Aug 30, 2025, at 17:38, Andrew Lunn <andrew@...n.ch> wrote:
>
>
>>
>>> +&gmac0 {
>>> + assigned-clocks = <&cru SCLK_GMAC0_RX_TX>, <&cru SCLK_GMAC0>;
>>> + assigned-clock-parents = <&cru SCLK_GMAC0_RGMII_SPEED>;
>>> + assigned-clock-rates = <0>, <125000000>;
>>> + clock_in_out = "output";
>>> + phy-handle = <&rgmii_phy0>;
>>> + phy-mode = "rgmii-id";
>>
>> Please change phy-mode here to "rgmii". This change will yield an ethernet
>> speed throughput change of a factor of 100+.
>
> Rockchip by default do bad things with RGMII delays.
>
> tx_delay:
> description: Delay value for TXD timing.
> $ref: /schemas/types.yaml#/definitions/uint32
> minimum: 0
> maximum: 0x7F
> default: 0x30
>
> rx_delay:
> description: Delay value for RXD timing.
> $ref: /schemas/types.yaml#/definitions/uint32
> minimum: 0
> maximum: 0x7F
> default: 0x10
>
> Try setting both of these to 0. And then use 'rgmii-id'.
>
> Andrew
Thank you!
>
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> Linux-rockchip@...ts.infradead.org
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