netdev - Re: [PATCH net v2] net: phy: phy_ethtool_ksettings_set: Don't discard phy_start

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Date:   Mon, 8 Nov 2021 18:57:05 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Bastian Germann <bage@...utronix.de>
Cc:     Benedikt Spranger <b.spranger@...utronix.de>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>, davem@...emloft.net,
        netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net v2] net: phy: phy_ethtool_ksettings_set: Don't
 discard phy_start_aneg's return

> It is BCM53125. Currently, you can set "mdix auto|off|on" which does
> not take any effect.  The chip will do what is its default depending
> on copper autonegotiation.
> 
> I am adding support for setting "mdix auto|off". I want the thing to error on "mdix on".
> Where would I add that check?

/* MDI or MDI-X status/control - if MDI/MDI_X/AUTO is set then
 * the driver is required to renegotiate link
 */
#define ETH_TP_MDI_INVALID	0x00 /* status: unknown; control: unsupported */
#define ETH_TP_MDI		0x01 /* status: MDI;     control: force MDI */
#define ETH_TP_MDI_X		0x02 /* status: MDI-X;   control: force MDI-X */
#define ETH_TP_MDI_AUTO		0x03 /*                  control: auto-select */

So there are three valid settings. And you are saying you only want to
implement two of them? If the hardware can do all three, you should
implement all three.

	  Andrew