From nobody Fri Apr 3 01:42:19 2026 Received: from e240-2.smtp-out.eu-north-1.amazonses.com (e240-2.smtp-out.eu-north-1.amazonses.com [23.251.240.2]) (using TLSv1.2 with cipher AES128-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8D37023EAA1; Mon, 16 Feb 2026 05:09:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=23.251.240.2 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771218554; cv=none; b=q7Z1zEgqmLrv1ioonWCwPiUl7mdTBLTjp7OlFUtdVd5cW5U7ekl9tqFYwMzbZYgl7U30fsH05cWxyQDXuebsiaPB3bwwoAodgfCtdEM9P3yUNHiDEVzSzx58DsrnsuL2klUCBPJ5tZ0J1ibj5lbe8zO21ksFTTvZSo3bfniCE8k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771218554; c=relaxed/simple; bh=zTF0n3ZPca6HiZM8IrHdiI8Fauoz8CjcIXBDOiAT/tY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:To:Cc; b=MkJP/rEwODhXLHov1h9vAW/ZyC901iHQYzZ8FbeXyESHlX+cjJSEOsN5EbPj69fzfKj2YG/YF/guiuNA9UsVpy1j5w8/YpWo1zskZ4fYeQgx2YI+GV7eDb7s1IiDUa3WJXqU3r94rIYbO5YkMZd0yCc+ZEhDEdkoae4vGIX5Iww= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=poleshift.se; spf=pass smtp.mailfrom=eu-north-1.amazonses.com; dkim=pass (2048-bit key) header.d=poleshift.se header.i=@poleshift.se header.b=2tlVPRf/; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b=hGCgZMxw; dkim=fail (0-bit key) header.d=poleshift.se header.i=@poleshift.se header.b=LgLghBYF reason="key not found in DNS"; arc=none smtp.client-ip=23.251.240.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=poleshift.se Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=eu-north-1.amazonses.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=poleshift.se header.i=@poleshift.se header.b="2tlVPRf/"; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b="hGCgZMxw"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=poleshift.se header.i=@poleshift.se header.b="LgLghBYF" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=n6aiayff3zq3manwyovyvpolm4pou2ef; d=poleshift.se; t=1771218550; h=From:Date:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:To:Cc; bh=zTF0n3ZPca6HiZM8IrHdiI8Fauoz8CjcIXBDOiAT/tY=; b=2tlVPRf/B3sugyh2Ov95zh6IcX4/vPt/UlhFsFt3Bi7SRyvsUVqq+o68aWVaAOf4 41HfxEjCo80mnxA0T7cBsERGhdgU3CgzIQJBqj4xxdqSIZTKJ2Tfmtn6R0iZWh8u/ii ZCVppHGMyvl7iQ6HsD1D8NrI5Q3rvmwfiolNtyaCj21owA6cUGoegoHLT5E4DkYOlZj kUNiy1Biqzj4yquBSUWkSEWosLn7RHh0I9r67I24h5+j0TgtYsMyuTtTAQwrvXDL+P2 SvbTmnc83yxpCNt7gs+AAirDtQXXTvpskvuv03XNfRNyOnztsqmP65Ze1d1lLAUmmmf 5ameCjNobA== DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=icdr7g7fbtu2nwxgaimytihkt42k3kiy; d=amazonses.com; t=1771218550; h=From:Date:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:To:Cc:Feedback-ID; bh=zTF0n3ZPca6HiZM8IrHdiI8Fauoz8CjcIXBDOiAT/tY=; b=hGCgZMxw6rviyFJGd/SgLl7Xvnpxo/QbqQXXsx0W1wFDP1qltlNNAMhMtSIQF+RX iLmTAvzjvu/bRmiIqzHo1F5KuLKnskl+O3bxPortzYLQM1TUeUI4MHIs4YwBQuPBuBd ECu0ChHUtIJsTkyQALSo47Sa6Xx00gcr/vG6qLNc= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=poleshift.se; s=20230429; t=1771218547; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=e8XzRtgRSeA6LjMJkop2UgCC+9WgG8clys3TIusKi84=; b=LgLghBYFYG2rfiSdHFvLfyUXiUYB9YejJCrL4AbvAJ/t7Yg6IUevW1TTCVpE4iXGhQ449t TpuppGKPSkh/sCP1dWi2UUTkdWlJ3aZFRn5ZN6g6/fhCzxOIYpWeSmUkDIOPV37cMxh+8r pwHYslGm0HKQXDYeBfnOxP76JbTo6ZQ= From: =?utf-8?q?Martin_P=C3=A5lsson?= Date: Mon, 16 Feb 2026 05:09:09 +0000 Subject: [PATCH v2] net: usb: lan78xx: scan all MDIO addresses on LAN7801 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="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <0110019c64da3c2a-d4a4adbe-c78b-4051-a95b-e7ed5db247a1-000000@eu-north-1.amazonses.com> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/4WNQQ6CMBBFr0K6dkynViSuuIdhMcJgJyKQDiEQw t2tXMDlez///80oR2E192wzkWdRGfoE7pSZOlD/YpAmsXHW5dahh476W7EsMIYVPqRvaGUB8il tGK/ka5OqY+Skj9lHlTiITkNcj5cZf/bP4IyAcHkSobVFjuzLcehYg7TTWdlU+75/AZI5RT27A AAA X-Change-ID: 20260214-lan78xx-phy-mask-fix-a4260de15a4c To: Thangaraj Samynathan , Rengarajan Sundararajan , UNGLinuxDriver@microchip.com, Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?Martin_P=C3=A5lsson?= X-Mailer: b4 0.14.3 Feedback-ID: ::1.eu-north-1.nVsitYrO9p3qnPLcZXP017jV0c/PN62ZbS4lYSSQpnA=:AmazonSES X-SES-Outgoing: 2026.02.16-23.251.240.2 The LAN7801 is designed exclusively for external PHYs (unlike the LAN7800/LAN7850 which have internal PHYs), but lan78xx_mdio_init() restricts PHY scanning to MDIO addresses 0-7 by setting phy_mask to ~(0xFF). This prevents discovery of external PHYs wired to addresses outside that range. One such case is the DP83TC814 100BASE-T1 PHY, which is typically configured at MDIO address 10 via PHYAD bootstrap pins and goes undetected with the current mask. Set phy_mask to 0 for the LAN7801 so that all 32 MDIO addresses are scanned during bus registration, allowing any external PHY to be discovered regardless of its address. Fixes: 02dc1f3d613d ("lan78xx: add LAN7801 MAC only support") Signed-off-by: Martin P=C3=A5lsson --- Changes in v2: - Added Fixes: tag - Link to v1: https://lore.kernel.org/r/20260214-lan78xx-phy-mask-fix-v1-1-= 3baa100861e4@poleshift.se --- drivers/net/usb/lan78xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 00397a807393..9d8f1ff7028d 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -2094,8 +2094,8 @@ static int lan78xx_mdio_init(struct lan78xx_net *dev) dev->mdiobus->phy_mask =3D ~(1 << 1); break; case ID_REV_CHIP_ID_7801_: - /* scan thru PHYAD[2..0] */ - dev->mdiobus->phy_mask =3D ~(0xFF); + /* scan all 32 MDIO addresses for external PHYs */ + dev->mdiobus->phy_mask =3D 0; break; } =20 --- base-commit: ee5492fd88cfc079c19fbeac78e9e53b7f6c04f3 change-id: 20260214-lan78xx-phy-mask-fix-a4260de15a4c Best regards, --=20 Martin P=C3=A5lsson