netdev - [BUG] net: phy: genphy_loopback: add link speed configuration

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Date:   Tue, 14 Dec 2021 07:00:37 +0000
From:   "Ismail, Mohammad Athari" <mohammad.athari.ismail@...el.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        "Voon, Weifeng" <weifeng.voon@...el.com>,
        "Wong, Vee Khee" <vee.khee.wong@...el.com>
Subject: [BUG] net: phy: genphy_loopback: add link speed configuration

Hi Oleksij,

"net: phy: genphy_loopback: add link speed configuration" patch causes Marvell 88E1510 PHY not able to perform PHY loopback using ethtool command (ethtool -t eth0 offline). Below is the error message: 

"Marvell 88E1510 stmmac-3:01: genphy_loopback failed: -110" 

Tested on Intel Elkhart Lake platform (Synopsys Designware QoS MAC and Marvell88E1510 PHY). Kernel version is 5.15.x.

Reverting the patch able to fix the issue.

Thank you.

Regards,
Athari