linux-kernel - Re: [PATCH net-next v1 1/3] net: phy: micrel: add MDI/MDI-X control support for KSZ9477 switch-integrated PHYs

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Message-ID: <6597c2fd-077a-4eac-945f-97b43c130418@lunn.ch>
Date: Tue, 10 Jun 2025 14:31:45 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	kernel@...gutronix.de, linux-kernel@...r.kernel.org,
	Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/3] net: phy: micrel: add MDI/MDI-X control
 support for KSZ9477 switch-integrated PHYs

On Tue, Jun 10, 2025 at 11:13:52AM +0200, Oleksij Rempel wrote:
> Add MDI/MDI-X configuration support for PHYs integrated in the KSZ9477
> family of Ethernet switches.
> 
> All MDI/MDI-X configuration modes are supported:
>   - Automatic MDI/MDI-X (ETH_TP_MDI_AUTO)
>   - Forced MDI (ETH_TP_MDI)
>   - Forced MDI-X (ETH_TP_MDI_X)
> 
> However, when operating in automatic mode, the PHY does not expose the
> resolved crossover status (i.e., whether MDI or MDI-X is active).
> Therefore, in auto mode, the driver reports ETH_TP_MDI_INVALID as
> the current status.

I assume you also considered returning ETH_TP_MDI_AUTO? What makes
INVALID better than AUTO?

	Andrew