netdev - Re: [PATCH] net: phy: mscc: enable MAC SerDes autonegotiation

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Message-ID: <Yf6QbbqaxZhZPUdC@lunn.ch>
Date:   Sat, 5 Feb 2022 15:57:49 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Raag Jadav <raagjadav@...il.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: mscc: enable MAC SerDes autonegotiation

On Sat, Feb 05, 2022 at 12:14:52PM +0530, Raag Jadav wrote:
> Enable MAC SerDes autonegotiation to distinguish between
> 1000BASE-X, SGMII and QSGMII MAC.

How does autoneg help you here? It just tells you about duplex, pause
etc. It does not indicate 1000BaseX, SGMII etc. The PHY should be
using whatever mode it was passed in phydev->interface, which the MAC
sets when it calls the connection function. If the PHY dynamically
changes its host side mode as a result of what that line side is
doing, it should also change phydev->interface. However, as far as i
can see, the mscc does not do this.

So i don't understand this commit message.

   Andrew