linux-kernel - Re: [PATCH net-next v5 2/6] dsa: lan9303: move Turbo Mode bit initialization

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Message-ID: <20221209201353.2d6f4852@kernel.org>
Date:   Fri, 9 Dec 2022 20:13:53 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jerry Ray <jerry.ray@...rochip.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Paolo Abeni" <pabeni@...hat.com>, <jbe@...gutronix.de>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux@...linux.org.uk>
Subject: Re: [PATCH net-next v5 2/6] dsa: lan9303: move Turbo Mode bit
 initialization

On Fri, 9 Dec 2022 16:47:09 -0600 Jerry Ray wrote:
> In preparing to remove the .adjust_link api, I am moving the one-time
> initialization of the device's Turbo Mode bit into a different execution
> path. This code clears (disables) the Turbo Mode bit which is never used
> by this driver. Turbo Mode is a non-standard mode that would allow the
> 100Mbps RMII interface to run at 200Mbps.

> @@ -1073,14 +1079,6 @@ static void lan9303_adjust_link(struct dsa_switch *ds, int port,
>  		ctl &= ~BMCR_FULLDPLX;
>  
>  	lan9303_phy_write(ds, port, MII_BMCR, ctl);
> -
> -	if (port == chip->phy_addr_base) {
> -		/* Virtual Phy: Remove Turbo 200Mbit mode */
> -		lan9303_read(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, &ctl);
> -
> -		ctl &= ~LAN9303_VIRT_SPECIAL_TURBO;
> -		regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, ctl);
> -	}
>  }
>  
>  static int lan9303_port_enable(struct dsa_switch *ds, int port,

The chip variable has to go, otherwise there will be a warning in
bisection until patch 6 removes this entire function:

drivers/net/dsa/lan9303-core.c:1059:18: warning: unused variable 'chip' [-Wunused-variable]
        struct lan9303 *chip = ds->priv;
                        ^