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 6B4C125B2F4; Tue, 15 Sep 2026 12:37:19 +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=1789475841; cv=none; b=QHYYRWKeDNxAeGjwmjEw4voNAXzIlCn4WLd9nhhK5LIBd1s4Q+pQA5HLwa6TqfJ10/6eXyzN4Ec+x5LDFnJvIX8J6L0UIUyrRnvygPPdcaxhfuk1CfR7c83QUaFKOSQmuTMKHByQ8SmYY++y1j2FwEEokvkBn7xYBgvaBbLyZtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789475841; c=relaxed/simple; bh=fnN1sj8oxpNX3SAnWaacVMDCfYcxGT1y/iY+83O2SUI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=hcmVKXAUZa1aiV36djeKcFft/Jyry8qEswdV/6N5d0/Vg4+k03ea6MaRiuY1ApvBw9wgN3eD/Lm1juYZkNKtweZnzIQ42RsOCz/FiRNFQ2Hl1AaJ82wWfBh8PIQ0D+mm7cgcd07fBdVHnQtUEQQ386ZMUKab/j/nqBOjafkBAQk= 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=W7GR/RNj; 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="W7GR/RNj" 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=j996zvvqMoODqxFqgltWJRyO5tLYKcpJCdsDyVsTL10=; b=W7GR/RNjZ9Pgmzh9nKUccvB4Ek 7HQZGDmsQlnyNI5fMKKiGTVXCbjQ07JXKXnVmQU+p3kY1PKJDX+EnnGKXDPXHetSz4HKx3JLqZcOD jMUZvGklIBd1r5egq5dzjUSnKUiNHPTnjNu5IDzKZWLbR2foStvgvlksMnukXhdjVYOw=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1x6SPG-005Gxn-PF; Tue, 15 Sep 2026 14:37:02 +0200 Date: Tue, 15 Sep 2026 14:37:02 +0200 From: Andrew Lunn To: "A. Sverdlin" Cc: netdev@vger.kernel.org, Heiner Kallweit , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-kernel@vger.kernel.org, Aleksander Jan Bajkowski , Daniel Golle , John Crispin , Hauke Mehrtens , stable@vger.kernel.org Subject: Re: [PATCH] net: phy: intel-xway: workaround 100BASE-TX Link-Up issue Message-ID: <8768cdd3-e65f-4e74-9700-c21d642fa15d@lunn.ch> References: <20260915085921.1354706-1-alexander.sverdlin@siemens.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: <20260915085921.1354706-1-alexander.sverdlin@siemens.com> On Tue, Sep 15, 2026 at 10:59:17AM +0200, A. Sverdlin wrote: > From: Alexander Sverdlin > > MaxLinear GSW12x/GSW14x Ethernet Switch Errata Sheet states: > "An issue has been sporadically observed after device power-on on the first > link-up attempt in 100BASE-TX mode resulting in either the link-up taking a > long time, or failing to link-up altogether... > > Workaround: > After power-on, enable Cable Diagnostic Mode for all ports and disable > it..." > > Implement the proposed workaround unconditionally in the Intel XWAY driver > (MaxLinear GSW1xx switches incorporate Intel XWAY PHYs) because the > diagnostic bits have the same meaning even in older integral PHYs such as > GPY111/PEF7071/PHY11G. So it's not clear how to distinguish the affected > newer integrated PHYs, but the workaround should not hurt the older PHYs. > > Cc: stable@vger.kernel.org Please set the Subject: line correctly to indicate net, and include a Fixes: tag. https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html Out if interest, is there sufficient details in the data sheet to implement cable diagnostics? Andrew --- pw-bot: cr