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 Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60285C2A070 for ; Sun, 4 Jan 2026 23:54:46 +0000 (UTC) Received: from mx.nabladev.com (mx.nabladev.com [178.251.229.89]) by mx.groups.io with SMTP id smtpd.msgproc01-g2.46737.1767547771091344121 for ; Sun, 04 Jan 2026 09:29:31 -0800 Authentication-Results: mx.groups.io; dkim=pass header.i=@nabladev.com header.s=dkim header.b=hKLyW+dN; spf=pass (domain: nabladev.com, ip: 178.251.229.89, mailfrom: pavel@nabladev.com) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 935E2FFF10; Sun, 4 Jan 2026 18:29:28 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nabladev.com; s=dkim; t=1767547769; h=from:subject:date:message-id:to:cc:mime-version:content-type: in-reply-to:references; bh=RFjIhXCArRHw19qiMZdrcZWytcdqvmebysq6VmTGqNw=; b=hKLyW+dNdP2wZcFstGstqxibVD+wEO7d1NNMKjgEcD9kTgJGp8CgOv6PWcHYDVF4qkoOXE 0/dLu2f59RbzA4cdia6EhSytQ7RvM+eDk8qhctrOKC5ivsj5pcY0SalAre9f1nUIAXa/R3 3qiDq66bZ0D4lpCRTiHPzB1lG15ZbU+cncQP0MLHyFZZ6VexuyMI2TtwfaK6nSLkFJxlhs JBSgbhyzdoxe+v4fGzklX5Nt2rHxBjAGYoMiWNxgC1ena8VJiCH4/+dsd2Fyo4kmIxTLv2 Gf/uTJC5b+wLb3lmT9lhl+iB7fhNXmY698CFEaZ1yIWqDBykxjlJCbJb/pWNuQ== Date: Sun, 4 Jan 2026 18:29:27 +0100 From: Pavel Machek To: ovidiu.panait.rb@renesas.com Cc: cip-dev@lists.cip-project.org, nobuhiro.iwamatsu.x90@mail.toshiba Subject: Re: [cip-dev] [PATCH 6.1.y-cip 0/3] net: stmmac: Fix EEE-related issues Message-ID: References: <20251229083954.3598-1-ovidiu.panait.rb@renesas.com> MIME-Version: 1.0 In-Reply-To: <20251229083954.3598-1-ovidiu.panait.rb@renesas.com> X-Last-TLS-Session-Version: TLSv1.3 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="YXMoPxElRIPxzSVN" Content-Disposition: inline List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Sun, 04 Jan 2026 23:54:46 -0000 X-Groupsio-URL: https://lists.cip-project.org/g/cip-dev/message/21301 --YXMoPxElRIPxzSVN Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! >=20 > When testing Ethernet on the Renesas RZ/V2H and RZ/V2N platforms with > 6.1-cip, LPI interrupt storms and VLAN register access timeouts were > observed. >=20 > Both issues are caused by the RX clock stop feature being enabled by > default. When EEE is active and the link is idle, the PHY stops the > RX clock to save power. However, the stmmac hardware requires the RX > clock to be running when accessing certain registers. >=20 > More specifically, VLAN operations fail with: >=20 > # ip link add link end1 name end1.5 type vlan id 5 > 15c40000.ethernet end1: Timeout accessing MAC_VLAN_Tag_Filter > RTNETLINK answers: Device or resource busy >=20 > Also, LPI interrupt storms occur because the RX clock may be stopped when > the driver attempts to clear the pending interrupt. The interrupt is > not cleared and keeps re-triggering until the RX clock resumes. >=20 > A comprehensive overview of RX clock related issues in stmmac can be > found in these threads: > https://lore.kernel.org/all/20251026122905.29028-1-laurent.pinchart@ideas= onboard.com/ > https://lore.kernel.org/all/Z9ySeo61VYTClIJJ@shell.armlinux.org.uk/ >=20 > These issues are already fixed in mainline. This series backports the > relevant stmmac EEE fixes to 6.1-cip. I had a minor comment here, but that should be fixed in mainline, first, so should not block the merge. Reviewed-by: Pavel Machek I can apply the series if it passes testing and there are no other comments. Best regards, Pavel --=20 In cooperation with Nabla. --YXMoPxElRIPxzSVN Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQRPfPO7r0eAhk010v0w5/Bqldv68gUCaVqjdwAKCRAw5/Bqldv6 8ujlAJ9DXp6e1azWIQPH1v8nze39OGz1MwCfQXuuhpuUwzrvLWToIBqnL9ChqzU= =4NDg -----END PGP SIGNATURE----- --YXMoPxElRIPxzSVN--