From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=156.67.10.101 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794254111; b=sM2QFoC2uAETeuNeLzvlKfoQlpSloahEzfT2eSnL50YNA0U+/1rUvDcCfNCiFCRDCDN6 tJf7dZ6HUu2zMa8FlCHLhaVtf9CBBfPDoHDWMZRLcTW5S/Bw8G5FoN6biteCa6QnN2UbB ogcy7gL0WivBRIke1wmebq0xicQCbn5Cn1mmGn0RhjKe2vsrGBUNdhZ6XXNixGZA6AuTj jueAegJSrEuAgqSEo1k5qKUK8RNiG81L66Mgfrrxro+Ph+aOGYsXbso75pq7al0yBF2YD 4mXDU50B/ZqlVXusDBa8jajKQz6/ex6d2Gic43Rqqcof6P1gIxfDAnkJOd4gPi2PHcg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794254111; h=DMARC-Filter:DKIM-Signature:Received:Date:From:To:Cc:Subject: Message-ID:References:MIME-Version:Content-Type:Content-Disposition: In-Reply-To; bh=BYHIJBcBzX4woTKDxJ+AvoVlmuTug2Ro1Y2L1Yciwrw=; b=PIzu9fsw0sHM9zVmV3MBPlru0W9X5C2+kwLCJ+O94NGHPIvvY6NZvE4VAgHFdafdMuTN j8aZvelP0zbOo3MeFiekYyFlnImwTRf5dirlaRwAdOkLhhwdtxKrkJhGZmekF6vN2HCYy Gp0wVI0K8NRpujQrVz9QY/+OmmnRSV0YbfiVWgCuFJZvRzvgkEloVYUHu4AtLC7Y3JrRZ +Z7Hb6YhA3cZlhzFUaUSGkYEEEuWNerEGfuN1JVFwX35faAk/Og2l9LLkbuPGbHoW6q91 9rdrDw0Rxzl8v0rVn2medY2WYQ4f/5bv/ItUtEe5EhiKecF8bk+NxI2EH+bqzBKM2hg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=lunn.ch; spf=pass smtp.mailfrom=lunn.ch; dkim=pass header.d=lunn.ch header.i=@lunn.ch header.a=rsa-sha256 header.s=20171124 header.b=B4raoCQN; arc=none smtp.remote-ip=156.67.10.101 Received: from vps0.lunn.ch (vps0.lunn.ch [156.67.10.101]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C65B3606A33E; Mon, 9 Nov 2026 19:55:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org C65B3606A33E Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lunn.ch Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.a=rsa-sha256 header.s=20171124 header.b=B4raoCQN DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Disposition:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:From:Sender:Reply-To:Subject: Date:Message-ID:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Content-Disposition:In-Reply-To:References; bh=BYHIJBcBzX4woTKDxJ+AvoVlmuTug2Ro1Y2L1Yciwrw=; b=B4raoCQN8gsvUex+Q8OePWBW7u r5YhYneu+ii6Y+mO/SOP08HMZ2rhwY11TMJVcztNP32aNQf9Nwd8MbDynYHGNyUQkvDzmynieRU1M JzrwsgEQt8iH5AsXqOXiWuVW/imtOxouUCyS74/XKA3JHH9T6nY/3otCIto+Ebw8R0g8=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1xQVSN-00FKho-06; Mon, 09 Nov 2026 20:55:07 +0100 Date: Mon, 9 Nov 2026 20:55:06 +0100 From: Andrew Lunn To: Pufan Jin Cc: Conor Dooley , Heiko Stuebner , Krzysztof Kozlowski , Rob Herring , 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 Message-ID: References: <20261109191515.252449-1-cyan2254650260@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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