From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from vps0.lunn.ch (vps0.lunn.ch [156.67.10.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3B4A36F8EA; Tue, 18 Aug 2026 19:40:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=156.67.10.101 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787082020; cv=none; b=urFv5FFCxgUwRHPdYKMr6coCT19j8l/RZk+zyNzLUA3wFpeULsxXyg7VwP2vx/xor/QYhkMLQ/cVf7Bknouwtfmhbrc17RaAGIy4vCq9lwguLaVrj0J+hD825YhxAsQ/uNtSt/mSUrByqbSqRlxiSWPWK9G5dwW0WK4jjsBam5Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787082020; c=relaxed/simple; bh=T2wJ9BjgRlsdLny/z53s7gb5yXot30mUfku1kmL3cRg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=VeuBPXq8W22+iDy2c6vlfQEnugaN1dzSGccULc60e9oldJH5dhEtptRLBOdNLJQ+Rbe6trw89A4Gi+7ptB5KOhHf642Z3oRtjKw4wN3XL8rNj+ljOV9zydfrDUzcfwDum2FoyWfVdZh+VgAJ20ac0XEO0+izv4ftdezuN5VDkIs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch; spf=pass smtp.mailfrom=lunn.ch; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b=ahId5uog; arc=none smtp.client-ip=156.67.10.101 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.b="ahId5uog" 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=qcY5lCMzzbsfrlx8fIBhERSXargFQ45oBwuw6EHCuyk=; b=ahId5uog8Ffs5KIo/LUL03I1vd duIMVbKN3UkcDna0YmZEal2W7nQdg8aKn7BOP12XRJH7a5u2sT35vbzcbP6VmqbpEcdn+QddbtRDX XMClXaNS9hganQXJt26oXTOOogAJuK61zg1j76utj3RfadhDdF48bTb0OQ+l+DPwQVuc=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1wwPf8-000WD7-SX; Tue, 18 Aug 2026 21:39:54 +0200 Date: Tue, 18 Aug 2026 21:39:54 +0200 From: Andrew Lunn To: Vladislav Karmanov Cc: netdev@vger.kernel.org, chester.a.unal@arinc9.com, daniel@makrotopia.org, dqfext@gmail.com, sean.wang@mediatek.com, olteanv@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, yangshiji66@outlook.com Subject: Re: [PATCH net] net: dsa: mt7530: do not advertise EEE on MT7621 switch Message-ID: <4854e2d6-df1e-4ada-bf49-0623bd207e6a@lunn.ch> References: <20260818182829.1580811-1-vladislav.karmanov.dev@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260818182829.1580811-1-vladislav.karmanov.dev@gmail.com> On Tue, Aug 18, 2026 at 09:28:29PM +0300, Vladislav Karmanov wrote: > From: Shiji Yang > Date: Sat, 28 Mar 2026 23:29:56 +0800 > > There are hardware defects in the MT7621 (MT7530) EEE support: with EEE > advertised, some link partners cannot establish a stable connection. > Notably, on a 2-pair (4-wire) cable where both ends advertise gigabit, > 1000BASE-T training cannot succeed, and instead of falling back to > 100 Mbps the port flaps in a loop and no link/DHCP lease is obtained. > This is confined to the WAN / phylib bring-up path; the DSA/LAN side on > the same device is unaffected. Do we know what is broken here? MAC or PHY? If it is the PHY which is broken, it would be better to put the workaround into the PHY driver. Andrew