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Date:   Mon, 25 Apr 2022 00:01:07 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Marcel Ziswiler <marcel.ziswiler@toradex.com>
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Subject: Re: net: stmmac: dwmac-imx: half duplex crash
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On Sat, Apr 23, 2022 at 10:58:07PM +0000, Marcel Ziswiler wrote:
> Hi there
> 
> We lately tried operating the IMX8MPEVK ENET_QOS imx-dwmac driver in half-duplex modes which crashes as
> follows:

How many transmit queues do you have in operation:

       /* Half-Duplex can only work with single queue */
        if (priv->plat->tx_queues_to_use > 1)
                priv->phylink_config.mac_capabilities &=
                        ~(MAC_10HD | MAC_100HD | MAC_1000HD);

What does ethtool show before you force it? Does it actually list the
HALF modes?

     Andrew