Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752189AbdHAQGe (ORCPT ); Tue, 1 Aug 2017 12:06:34 -0400 Received: from vps0.lunn.ch ([178.209.37.122]:48015 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751607AbdHAQGc (ORCPT ); Tue, 1 Aug 2017 12:06:32 -0400 Date: Tue, 1 Aug 2017 18:06:28 +0200 From: Andrew Lunn To: Vivien Didelot Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@savoirfairelinux.com, "David S. Miller" , Florian Fainelli Subject: Re: [PATCH net-next 10/11] net: dsa: mv88e6xxx: remove EEE support Message-ID: <20170801160628.GJ23157@lunn.ch> References: <20170731221719.16695-1-vivien.didelot@savoirfairelinux.com> <20170731221719.16695-11-vivien.didelot@savoirfairelinux.com> <20170801142843.GE23157@lunn.ch> <87r2wv2tci.fsf@weeman.i-did-not-set--mail-host-address--so-tickle-me> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87r2wv2tci.fsf@weeman.i-did-not-set--mail-host-address--so-tickle-me> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1185 Lines: 30 On Tue, Aug 01, 2017 at 11:36:13AM -0400, Vivien Didelot wrote: > Hi Andrew, > > Andrew Lunn writes: > > > On Mon, Jul 31, 2017 at 06:17:18PM -0400, Vivien Didelot wrote: > >> The PHY's EEE settings are already accessed by the DSA layer through the > >> Marvell PHY driver and there is nothing to be done for switch's MACs. > > > > I'm confused, or missing something. Does not patch #1 mean that if the > > DSA driver does not have a set_eee function, we always return -ENODEV > > in slave.c? > > If there is a PHY, phy_init_eee (if eee_enabled is true) and > phy_ethtool_set_eee is called. If there is a .set_eee op, it is > called. If both are absent, -ENODEV is returned. O.K, i don't think that is correct. EEE should only be enabled if both the MAC and the PHY supports it. We need some way for the MAC to indicate it does not support EEE. If set_eee is optional the meaning of a NULL pointer is that the MAC does support EEE. So for mv88e6060, lan9303, microchip and mt7530 which currently don't support EEE, you need to add a set_eee which returns -ENODEV. Having to implement the op to say you don't implement the feature just seems wrong. Andrew