From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752733AbcDOWae (ORCPT ); Fri, 15 Apr 2016 18:30:34 -0400 Received: from vps0.lunn.ch ([178.209.37.122]:58118 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751939AbcDOWac (ORCPT ); Fri, 15 Apr 2016 18:30:32 -0400 Date: Sat, 16 Apr 2016 00:30:26 +0200 From: Andrew Lunn To: Alexandre Belloni Cc: Florian Fainelli , "David S . Miller" , Nicolas Ferre , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] net: phy: Ensure the state machine is called when phy is UP Message-ID: <20160415223026.GD26665@lunn.ch> References: <1460750172-7796-1-git-send-email-alexandre.belloni@free-electrons.com> <57114AA4.5080803@gmail.com> <20160415205613.GE25196@piout.net> <20160415220508.GC26665@lunn.ch> <20160415221711.GG25196@piout.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160415221711.GG25196@piout.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 16, 2016 at 12:17:11AM +0200, Alexandre Belloni wrote: > On 16/04/2016 at 00:05:08 +0200, Andrew Lunn wrote : > > > Trace without my patch: > > > libphy: MACB_mii_bus: probed > > > macb f8020000.ethernet eth0: Cadence GEM rev 0x00020120 at 0xf8020000 irq 27 (fc:c2:3d:0c:6e:05) > > > Micrel KSZ8081 or KSZ8091 f8020000.etherne:01: attached PHY driver [Micrel KSZ8081 or KSZ8091] (mii_bus:phy_addr=f8020000.etherne:01, irq=171) > > > Micrel KSZ8081 or KSZ8091 f8020000.etherne:01: PHY state change READY -> READY > > > [...] > > > Micrel KSZ8081 or KSZ8091 f8020000.etherne:01: PHY state change READY -> READY > > > > Are there some state changes before this? How is it getting to state > > READY? It would expect it to start in DOWN, from when the phy device > > was created in phy_device_create(). > > > > No other changes. I forgot to mention that this is when booting with a > cable plugged in. Unplugging and replugging the cable makes the link > detection work fine even without the patch. Are you tftpbooting? I.e. has the boot loader already done an auto negotiation? I've looked at the code and i still don't see how it gets to READY. What i do see is that when you connect the phy to the MAC, the interrupt handler is installed. So maybe there are some PHY interrupts before the interface is opened? Could you put a print in phy_interrupt(). Andrew