netdev - Re: FEC MDIO read timeout on linkup

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Message-ID: <20220429151513.GA28631@francesco-nb.int.toradex.com>
Date:   Fri, 29 Apr 2022 17:15:13 +0200
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        netdev <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Tim Harvey <tharvey@...eworks.com>
Subject: Re: FEC MDIO read timeout on linkup

On Fri, Apr 22, 2022 at 06:04:00PM +0200, Francesco Dolcini wrote:
> On Fri, Apr 22, 2022 at 12:55:22PM -0300, Fabio Estevam wrote:
> > On Fri, Apr 22, 2022 at 12:26 PM Francesco Dolcini
> > <francesco.dolcini@...adex.com> wrote:
> > > What I can see from the code is that the timeout is coming from
> > > net/phy/micrel.c:kszphy_handle_interrupt().
> > 
> > For debugging purposes, could you try not to describe the Ethernet PHY
> > irq pin inside imx6qdl-apalis.dtsi?
> Yep, we'll try to see what's going on with polling instead that having the
> interrupt enabled.

So, I was not able to reproduce the issue polling the phy instead of
using interrupt. I gonna investigate more in the direction of a race
condition somewhere, unfortunately I had very limited time to work on
this in the last days.

Francesco