From nobody Fri Apr 17 20:28:31 2026 Received: from e240-5.smtp-out.eu-north-1.amazonses.com (e240-5.smtp-out.eu-north-1.amazonses.com [23.251.240.5]) (using TLSv1.2 with cipher AES128-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B90EA2FE58F; Sat, 14 Feb 2026 12:15:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=23.251.240.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771071328; cv=none; b=duTfQiVZRLphsJOMLqP/bB4JVdzHlCfPXpsTnXQmxQcvBM/sRqElYXfIBsx3r3ux4JQVN/5FmEM4jX+znrbS+Q8nqW+iAjW0o8+4uh/4rcsRKTZGYVw6vpbgDMQE+Hbs6b13ldCP2wuw6QZVRKOZwKqdD5q/u/byxESetDkJCJQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771071328; c=relaxed/simple; bh=rFlgiUhbRa59lDQuTF6+GPlvrsi3zx3UKYbAFtUx9IQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:To:Cc; b=ia8FAcHJz62a4WPjCeFo35IDCl+ZtG3EXz4fmC2PtzhfAN13uDxtTCqFqlJH8nSj6RowsnQjfY/cYE0cnxok7ez2CIUC6+H78FUkomu5TNz3kEJk2S01wrpVcgwFmaodxvO5hmoZWs6aH4bdLDN7Txj9mCNm6Q5Z5hBJdAsuX/4= 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=IMWwiVTC; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b=N13hJtPN; dkim=fail (0-bit key) header.d=poleshift.se header.i=@poleshift.se header.b=BBxj/c4r reason="key not found in DNS"; arc=none smtp.client-ip=23.251.240.5 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="IMWwiVTC"; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b="N13hJtPN"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=poleshift.se header.i=@poleshift.se header.b="BBxj/c4r" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=n6aiayff3zq3manwyovyvpolm4pou2ef; d=poleshift.se; t=1771071321; h=From:Date:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:To:Cc; bh=rFlgiUhbRa59lDQuTF6+GPlvrsi3zx3UKYbAFtUx9IQ=; b=IMWwiVTCmdar/Uhb/2jpXwqmhFrJWZVYEM0AbyHoBjUpQm9J6kEZI6dPhVdz8CBf BRRGyTldQUZbdn8ZB7J5h3COVhXS4UPUKtG3nt+n780lQYKlaKgoS74adCpPzzOD4zg GmcmaUDlfMHtQy6pabRUEvZg+ZtMMCDQtGPtWB/kLcrenghz011cx7HMNgM7UnEsuGj h3sXKHWkBjkC8Mr2+y6KvZ4AAjqDER5h8w2bD7OeKrGUOAd2KIM4z0YQjU2FXKk44Ua 47u1LeTn7QvH/VDh0x59BtJLLoul9lwo3J8dNlfBSCqWen0ImMm+9AJFuv+Bb1kkNhy wtYV8leIFw== DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=icdr7g7fbtu2nwxgaimytihkt42k3kiy; d=amazonses.com; t=1771071321; h=From:Date:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:To:Cc:Feedback-ID; bh=rFlgiUhbRa59lDQuTF6+GPlvrsi3zx3UKYbAFtUx9IQ=; b=N13hJtPNUVjB1iv7w7AHY/h9FiQ6dsjzcfpion0zhoiEzvmz7hqhGwcgtf4B9kpt w1LPyYGymytJRH5XbEOjWm1LfikC1/FMuULfCaTtsPTllFL6FC4qM5nECnl5JB05loN 1kX8oSWwdhKfGTmNV2R0hv+NoGa5spjVBxoZNXq4= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=poleshift.se; s=20230429; t=1771071319; 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=yq1Yi+g/1PPOy4yvt0Qjkyz18T5vp1xuhQ51csxeR08=; b=BBxj/c4rHbZ7jB1/a4dfP5ENbflvy1BBh1h02ZzBFCpumejhpzx4tgVcPZ3Tu/38S0gWAQ +jR6u2vGHyVXMx4AfNvYtJMa0VxpfNL/3P0p30IaAoL6nMkPE+h7f7O8b4plFqvmvKvY8n a9QOZ/C/pcDt1XUF2aPAsSq50PHqQpo= From: =?utf-8?q?Martin_P=C3=A5lsson?= Date: Sat, 14 Feb 2026 12:15:21 +0000 Subject: [PATCH] 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: <0110019c5c13b668-dd1f5db3-309a-442a-b483-262c4edbb360-000000@eu-north-1.amazonses.com> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/x2MSwqAMAwFryJZG7ClfvAq4iJo1KBWaUEq4t0NL ucNbx6IHIQjtNkDgS+JcngFk2cwLORnRhmVwRa2KqxxuJGvm5TwXG7cKa44SUJyakc2JbkB9Ho G1vnPdv37fnqamtVmAAAA 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 , martin@poleshift.se Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.3 Feedback-ID: ::1.eu-north-1.nVsitYrO9p3qnPLcZXP017jV0c/PN62ZbS4lYSSQpnA=:AmazonSES X-SES-Outgoing: 2026.02.14-23.251.240.5 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. Signed-off-by: Martin P=C3=A5lsson --- 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