From patchwork Tue May 4 22:29:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Marangi X-Patchwork-Id: 12238619 X-Patchwork-Delegate: kuba@kernel.org 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 D7750C433B4 for ; Tue, 4 May 2021 22:30:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91619613BA for ; Tue, 4 May 2021 22:30:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233210AbhEDWbk (ORCPT ); Tue, 4 May 2021 18:31:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233160AbhEDWaq (ORCPT ); Tue, 4 May 2021 18:30:46 -0400 Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6C0DC06174A; Tue, 4 May 2021 15:29:49 -0700 (PDT) Received: by mail-ej1-x62c.google.com with SMTP id b25so15588003eju.5; Tue, 04 May 2021 15:29:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=lxVgYY/ynXCAEKAsuKTSHi68DPLsSQLz31l13nMArY4=; b=RftIqtnKyj1zeXOQzz94oDymxoT2D67j52QHkvENbI59SbXQdvZqgXYMuxC7MLcZi3 f60z3mAZgekwZFQGY1D8Ag2ZO7a2gWl3CtOmxIcmsRPTt1UNYj6OcIE3LW2vF2j/XdPS fn2y2tLW9Bt3w69ksgNvLwCI0k1sQ1mOUvtVxcV51dQp7eSUKL/aqyHnqCmd6itA0jja 0VjkTOxya6/asVe908+RGuTR3PvYX1hZchPHAiGpr2pQYOfdcf9Xr035XLcO6fGn9M9I WCzVtfS+E8Vqt3+5U2vWK/D9+FkTExx2wfsZ++CpYCdKp96PWw/6aavIsZjS19hCax4Z V2/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=lxVgYY/ynXCAEKAsuKTSHi68DPLsSQLz31l13nMArY4=; b=lZL0SusEnSyvT4pTgvI+ajas1uU/Ulyy2l2osPqpQ/PNv3wzM6dNmNvCq1UVUqWsAv GDVw6v5ceaPC5UY6wubQlL1z1X997I0HHlPoXsvHRYnkbdRSOWzXwXsYJEc7W/n1J2Sw XltDHBTLUaccL80f0KAw0gAAIPHPQ0+romGuLIZ/CAFc1hZekw+McdmaQNi8jqkkM56n 5c/6tsNpKKXvk2nYtlQCFqJelS6EjnMdvTqGxW0TzHNy1yifi6dNg9RYoe3nBDwTt6sg y+8zmSjNnZlzptwlpusRmOZjqGsOFpwn8qXUK8kL40BpnneQDcu1pshAKd58JgBi12tM NzYA== X-Gm-Message-State: AOAM531kIOJP/XuZijTtDCeVZxrR2kLEXZn3ifBJcsqvXp39MBuGhG6R 6/vnGhfZAoJlmaAoCgknvGw= X-Google-Smtp-Source: ABdhPJzkz4TxC9K99xCe1dxHaz8/cJdSLxPynx6ys5RKHZt8sxfP4Aj8lIeIjivusO3SHhqUZ0Tr9w== X-Received: by 2002:a17:906:4d11:: with SMTP id r17mr24134842eju.217.1620167388511; Tue, 04 May 2021 15:29:48 -0700 (PDT) Received: from Ansuel-xps.localdomain (93-35-189-2.ip56.fastwebnet.it. [93.35.189.2]) by smtp.googlemail.com with ESMTPSA id q12sm2052946ejy.91.2021.05.04.15.29.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 May 2021 15:29:48 -0700 (PDT) From: Ansuel Smith To: Florian Fainelli Cc: Ansuel Smith , Andrew Lunn , Vivien Didelot , Vladimir Oltean , "David S. Miller" , Jakub Kicinski , Russell King , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH net-next v3 14/20] net: dsa: qca8k: clear MASTER_EN after phy read/write Date: Wed, 5 May 2021 00:29:08 +0200 Message-Id: <20210504222915.17206-14-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210504222915.17206-1-ansuelsmth@gmail.com> References: <20210504222915.17206-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Clear MDIO_MASTER_EN bit from MDIO_MASTER_CTRL after read/write operation. The MDIO_MASTER_EN bit is not reset after read/write operation and the next operation can be wrongly interpreted by the switch as a mdio operation. This cause a production of wrong/garbage data from the switch and underfined bheavior. (random port drop, unplugged port flagged with link up, wrong port speed) Also on driver remove the MASTER_CTRL can be left set and cause the malfunction of any next driver using the mdio device. Signed-off-by: Ansuel Smith --- drivers/net/dsa/qca8k.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c index cb9b44769e92..b21835d719b5 100644 --- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c @@ -655,8 +655,14 @@ qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data) if (ret) return ret; - return qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL, - QCA8K_MDIO_MASTER_BUSY); + ret = qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL, + QCA8K_MDIO_MASTER_BUSY); + + /* even if the busy_wait timeouts try to clear the MASTER_EN */ + qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL, + QCA8K_MDIO_MASTER_EN); + + return ret; } static int @@ -690,6 +696,10 @@ qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum) val &= QCA8K_MDIO_MASTER_DATA_MASK; + /* even if the busy_wait timeouts try to clear the MASTER_EN */ + qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL, + QCA8K_MDIO_MASTER_EN); + return val; }