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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 9739BC282CC for ; Thu, 7 Feb 2019 01:17:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 70E78218D3 for ; Thu, 7 Feb 2019 01:17:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726600AbfBGBQ7 (ORCPT ); Wed, 6 Feb 2019 20:16:59 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:39008 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726465AbfBGBQ7 (ORCPT ); Wed, 6 Feb 2019 20:16:59 -0500 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::bf5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 963031404973D; Wed, 6 Feb 2019 17:16:58 -0800 (PST) Date: Wed, 06 Feb 2019 17:16:57 -0800 (PST) Message-Id: <20190206.171657.1823157800327376584.davem@davemloft.net> To: miquel.raynal@bootlin.com Cc: andrew@lunn.ch, vivien.didelot@gmail.com, f.fainelli@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com, gregory.clement@bootlin.com, antoine.tenart@bootlin.com, maxime.chevallier@bootlin.com, nadavh@marvell.com Subject: Re: [PATCH net-next v3] net: dsa: mv88e6xxx: Prevent suspend to RAM From: David Miller In-Reply-To: <20190205110728.11451-1-miquel.raynal@bootlin.com> References: <20190205110728.11451-1-miquel.raynal@bootlin.com> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Wed, 06 Feb 2019 17:16:59 -0800 (PST) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Miquel Raynal Date: Tue, 5 Feb 2019 12:07:28 +0100 > On one hand, the mv88e6xxx driver has a work queue called in loop > which will attempt register accesses after MDIO bus suspension, that > entirely freezes the platform during suspend. > > On the other hand, the DSA core is not ready yet to support suspend to > RAM operation because so far there is no way to recover reliably the > switch configuration. > > To avoid the kernel to freeze when suspending with a switch driven by > the mv88e6xxx driver, we choose to prevent the driver suspension and > in the same way, the whole platform. > > Signed-off-by: Miquel Raynal Applied to net-next, thanks.