linux-kernel - Re: [PATCH v2 4/4] net: mtip: The L2 switch driver for imx287

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Message-ID: <022e19f5-9a9c-42eb-9358-a6fe832e8f5f@lunn.ch>
Date: Mon, 31 Mar 2025 00:01:20 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Lukasz Majewski <lukma@...x.de>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, davem@...emloft.net,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/4] net: mtip: The L2 switch driver for imx287

> > > +	/* Prevent a state halted on mii error */
> > > +	if (fep->mii_timeout && phy_dev->state == PHY_HALTED) {
> > > +		phy_dev->state = PHY_UP;
> > > +		goto spin_unlock;
> > > +	}  
> > 
> > A MAC driver should not be playing around with the internal state of
> > phylib.
> 
> Ok, I've replaced it with PHY API calls (phy_start() and
> phy_is_started()).

phy_start() and phy_stop() should be used in pairs. It is not good to
call start more often than stop.

What exactly is going on here? Why would there be MII errors?

	Andrew