From: Andrew Lunn <andrew@lunn.ch>
To: Pufan Jin <cyan2254650260@gmail.com>
Cc: Conor Dooley <conor+dt@kernel.org>,
Heiko Stuebner <heiko@sntech.de>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Rob Herring <robh@kernel.org>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org
Subject: Re: [PATCH] arm64: dts: rockchip: use rgmii-id for LubanCat 4 gmac1
Date: Mon, 9 Nov 2026 20:55:06 +0100 [thread overview]
Message-ID: <f2663951-aa1a-44de-87cc-8e7b105e1036@lunn.ch> (raw)
In-Reply-To: <20261109191515.252449-1-cyan2254650260@gmail.com>
On Tue, Nov 10, 2026 at 03:15:15AM +0800, Pufan Jin wrote:
> The LubanCat 4 PCB adds ~2ns of trace delay on both TXC and RXC, but
> that alone is not sufficient for reliable RGMII operation. With
> phy-mode = "rgmii" and zero MAC delays the link comes up at 1Gbps but
> drops ~90% of the packets; the PHY's internal TX/RX delay is required.
Sorry, but this does not make sense. 4ns of delay is 2ns too many.
You need a proper explanation of what is going on here.
Andrew
next prev parent reply other threads:[~2026-11-09 19:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-09 19:15 Pufan Jin
2026-11-09 19:55 ` Andrew Lunn [this message]
2026-11-09 20:48 ` Pufan Jin
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