netdev - Freescale network device not activated on mpc8360 (kmeter1 board)

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Date:   Tue, 7 Jan 2020 13:05:35 +0000
From:   Matteo Ghidoni <matteo.ghidoni@...abb.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "sux@...lof.de" <sux@...lof.de>
Subject: Freescale network device not activated on mpc8360 (kmeter1 board)

 Hi all,

With the introduction of the following patch, we are facing an issue with the activation of the Freescale network device (ucc_geth driver) on our kmeter1 board based on a MPC8360:

commit 124eee3f6955f7aa19b9e6ff5c9b6d37cb3d1e2c
Author: Heiner Kallweit <hkallweit1@...il.com>
Date:   Tue Sep 18 21:55:36 2018 +0200

    net: linkwatch: add check for netdevice being present to linkwatch_do_dev

Based on my observations, just before trying to activate the device through linkwatch_event, the controller wants to adjust the MAC configuration and in order to achieve this it detaches the device. This avoids the activation of the net device.

This is already happening with older versions (I checked with the v4.14.162) and also there the situation is the same, but without the additional check in the if condition the device is activated.

I am currently working with the v5.4.8 kernel version, but the behavior remains the same also with the latest v5.5-rc4.

Any idea how to solve this? Any help is appreciated.

Regards,
Matteo