From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 31F98264A92; Mon, 1 Dec 2025 11:32:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764588755; cv=none; b=U80O8gXuAmD1PdpnDB5IjuzK99l6WVZqC9EeVe/jLUtNFm58CXZE+c15ClF/6LMcHD+v6l1ocA1Hie2NeGvKUjUtv80EEbkQixhHVnh7y154EjxDs/lSpmzDUI8BHORIiuYLB3sVZYUNP+i6j9r2isyOszU+jzvyaa1su9oZnOk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764588755; c=relaxed/simple; bh=V7q9v3JAlOyLYXKxL077BZkaqlajfyNKumir4zAtG7s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=f6dqt6LGfWjtm0jV0A8IsxPFtI+xise2wxOQbbdB2CllUOkHC4wMunE/OMo59R04liBLbBTFnFIeJzndla+8OCCBiGfJ22fRKqiFAue3W34b108dtGa7Ina4+rmUkducI5OrjgKfAWim5CW3Vv0quM8xdMVrvUGPSZG0utzxwCE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=TySYqNZV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="TySYqNZV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A43BCC4CEF1; Mon, 1 Dec 2025 11:32:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764588755; bh=V7q9v3JAlOyLYXKxL077BZkaqlajfyNKumir4zAtG7s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TySYqNZVxSjaS4YDXl++hnz0ChBH1EbCvos23NaMspqV/Lnb+eWw9Fwqk0fEaK/BZ JrZYMwWgqabDqYnEy4yiR3a0psckdKiHOmZXb2cSV8gx84/mcIUBxdgVDEcGNhLdXR 3l+5WZlYnU+yFfu+NGhpfiEp979hWJ9A2ZuO9GAE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Fainelli , =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.4 116/187] net: dsa: b53: prevent GMII_PORT_OVERRIDE_CTRL access on BCM5325 Date: Mon, 1 Dec 2025 12:23:44 +0100 Message-ID: <20251201112245.421320820@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251201112241.242614045@linuxfoundation.org> References: <20251201112241.242614045@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Álvaro Fernández Rojas [ Upstream commit 37883bbc45a8555d6eca88d3a9730504d2dac86c ] BCM5325 doesn't implement GMII_PORT_OVERRIDE_CTRL register so we should avoid reading or writing it. PORT_OVERRIDE_RX_FLOW and PORT_OVERRIDE_TX_FLOW aren't defined on BCM5325 and we should use PORT_OVERRIDE_LP_FLOW_25 instead. Reviewed-by: Florian Fainelli Signed-off-by: Álvaro Fernández Rojas Link: https://patch.msgid.link/20250614080000.1884236-12-noltari@gmail.com Signed-off-by: Jakub Kicinski Stable-dep-of: b6a8a5477fe9 ("net: dsa: b53: fix resetting speed and pause on forced link") Signed-off-by: Sasha Levin --- drivers/net/dsa/b53/b53_common.c | 21 +++++++++++++++++---- drivers/net/dsa/b53/b53_regs.h | 1 + 2 files changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c index 4de302f20e4f3..dca23e0edb9a8 100644 --- a/drivers/net/dsa/b53/b53_common.c +++ b/drivers/net/dsa/b53/b53_common.c @@ -1026,6 +1026,8 @@ static void b53_force_link(struct b53_device *dev, int port, int link) if (port == dev->cpu_port) { off = B53_PORT_OVERRIDE_CTRL; val = PORT_OVERRIDE_EN; + } else if (is5325(dev)) { + return; } else { off = B53_GMII_PORT_OVERRIDE_CTRL(port); val = GMII_PO_EN; @@ -1050,6 +1052,8 @@ static void b53_force_port_config(struct b53_device *dev, int port, if (port == dev->cpu_port) { off = B53_PORT_OVERRIDE_CTRL; val = PORT_OVERRIDE_EN; + } else if (is5325(dev)) { + return; } else { off = B53_GMII_PORT_OVERRIDE_CTRL(port); val = GMII_PO_EN; @@ -1080,10 +1084,19 @@ static void b53_force_port_config(struct b53_device *dev, int port, return; } - if (rx_pause) - reg |= PORT_OVERRIDE_RX_FLOW; - if (tx_pause) - reg |= PORT_OVERRIDE_TX_FLOW; + if (rx_pause) { + if (is5325(dev)) + reg |= PORT_OVERRIDE_LP_FLOW_25; + else + reg |= PORT_OVERRIDE_RX_FLOW; + } + + if (tx_pause) { + if (is5325(dev)) + reg |= PORT_OVERRIDE_LP_FLOW_25; + else + reg |= PORT_OVERRIDE_TX_FLOW; + } b53_write8(dev, B53_CTRL_PAGE, off, reg); } diff --git a/drivers/net/dsa/b53/b53_regs.h b/drivers/net/dsa/b53/b53_regs.h index ea6897c3f6f76..77fb7ae660b8c 100644 --- a/drivers/net/dsa/b53/b53_regs.h +++ b/drivers/net/dsa/b53/b53_regs.h @@ -92,6 +92,7 @@ #define PORT_OVERRIDE_SPEED_10M (0 << PORT_OVERRIDE_SPEED_S) #define PORT_OVERRIDE_SPEED_100M (1 << PORT_OVERRIDE_SPEED_S) #define PORT_OVERRIDE_SPEED_1000M (2 << PORT_OVERRIDE_SPEED_S) +#define PORT_OVERRIDE_LP_FLOW_25 BIT(3) /* BCM5325 only */ #define PORT_OVERRIDE_RV_MII_25 BIT(4) /* BCM5325 only */ #define PORT_OVERRIDE_RX_FLOW BIT(4) #define PORT_OVERRIDE_TX_FLOW BIT(5) -- 2.51.0