From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A08F3C43381 for ; Fri, 8 Mar 2019 12:55:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E606208E4 for ; Fri, 8 Mar 2019 12:55:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552049717; bh=V36gT4x2aE+TqTvMGhxtoMMhS7SEdmtePx9BPdJ1bIs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=05jerjrczgvqiHPVPwg4ZL/pkEyZtHG9KmPXCaOfY1Uh1c89HnseDXEitRB4o+9oJ Xm2f2Oph5qtZUlokq49L5QO7lgSVMq42TUHhv6ArDXsbqbVNJRjOxtWNeCnm2XMjSx 2fcY86cDfSTLqkr7/j5gAf7Ua7YAS47hKychuxgs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727028AbfCHMzQ (ORCPT ); Fri, 8 Mar 2019 07:55:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:59162 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727452AbfCHMzL (ORCPT ); Fri, 8 Mar 2019 07:55:11 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6D0F02085A; Fri, 8 Mar 2019 12:55:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552049709; bh=V36gT4x2aE+TqTvMGhxtoMMhS7SEdmtePx9BPdJ1bIs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=05vP5hUNCI1ilj9ovmyemrRndNenmjEyfk3UwL6vnkkot09xP8qJzXzDaFzHjOMeA Co8T+pm2SwDhtIYCqJtAmCKLTLqcpreLAPi0iYXg577w1UdmKV66tZmSyUnqkUYxHN K75ivgtn9LQNcjWSRhRVoCiPOsw4dFbdlZj1TqPc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Onnasch , Rajasingh Thavamani , Andrew Lunn , "David S. Miller" Subject: [PATCH 4.20 40/76] net: phy: Micrel KSZ8061: link failure after cable connect Date: Fri, 8 Mar 2019 13:49:52 +0100 Message-Id: <20190308124916.237710706@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190308124914.789210760@linuxfoundation.org> References: <20190308124914.789210760@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rajasingh Thavamani [ Upstream commit 232ba3a51cc224b339c7114888ed7f0d4d95695e ] With Micrel KSZ8061 PHY, the link may occasionally not come up after Ethernet cable connect. The vendor's (Microchip, former Micrel) errata sheet 80000688A.pdf descripes the problem and possible workarounds in detail, see below. The batch implements workaround 1, which permanently fixes the issue. DESCRIPTION Link-up may not occur properly when the Ethernet cable is initially connected. This issue occurs more commonly when the cable is connected slowly, but it may occur any time a cable is connected. This issue occurs in the auto-negotiation circuit, and will not occur if auto-negotiation is disabled (which requires that the two link partners be set to the same speed and duplex). END USER IMPLICATIONS When this issue occurs, link is not established. Subsequent cable plug/unplaug cycle will not correct the issue. WORk AROUND There are four approaches to work around this issue: 1. This issue can be prevented by setting bit 15 in MMD device address 1, register 2, prior to connecting the cable or prior to setting the Restart Auto-negotiation bit in register 0h. The MMD registers are accessed via the indirect access registers Dh and Eh, or via the Micrel EthUtil utility as shown here: . if using the EthUtil utility (usually with a Micrel KSZ8061 Evaluation Board), type the following commands: > address 1 > mmd 1 > iw 2 b61a . Alternatively, write the following registers to write to the indirect MMD register: Write register Dh, data 0001h Write register Eh, data 0002h Write register Dh, data 4001h Write register Eh, data B61Ah 2. The issue can be avoided by disabling auto-negotiation in the KSZ8061, either by the strapping option, or by clearing bit 12 in register 0h. Care must be taken to ensure that the KSZ8061 and the link partner will link with the same speed and duplex. Note that the KSZ8061 defaults to full-duplex when auto-negotiation is off, but other devices may default to half-duplex in the event of failed auto-negotiation. 3. The issue can be avoided by connecting the cable prior to powering-up or resetting the KSZ8061, and leaving it plugged in thereafter. 4. If the above measures are not taken and the problem occurs, link can be recovered by setting the Restart Auto-Negotiation bit in register 0h, or by resetting or power cycling the device. Reset may be either hardware reset or software reset (register 0h, bit 15). PLAN This errata will not be corrected in the future revision. Fixes: 7ab59dc15e2f ("drivers/net/phy/micrel_phy: Add support for new PHYs") Signed-off-by: Alexander Onnasch Signed-off-by: Rajasingh Thavamani Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/phy/micrel.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -339,6 +339,17 @@ static int ksz8041_config_aneg(struct ph return genphy_config_aneg(phydev); } +static int ksz8061_config_init(struct phy_device *phydev) +{ + int ret; + + ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_DEVID1, 0xB61A); + if (ret) + return ret; + + return kszphy_config_init(phydev); +} + static int ksz9021_load_values_from_of(struct phy_device *phydev, const struct device_node *of_node, u16 reg, @@ -1044,7 +1055,7 @@ static struct phy_driver ksphy_driver[] .phy_id_mask = MICREL_PHY_ID_MASK, .features = PHY_BASIC_FEATURES, .flags = PHY_HAS_INTERRUPT, - .config_init = kszphy_config_init, + .config_init = ksz8061_config_init, .ack_interrupt = kszphy_ack_interrupt, .config_intr = kszphy_config_intr, .suspend = genphy_suspend,