linux-kernel - Re: [PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

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Message-ID: <Y7/zlzcyTsF+z0cN@shell.armlinux.org.uk>
Date:   Thu, 12 Jan 2023 11:48:39 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
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>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, jbe@...gutronix.de,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

On Mon, Jan 09, 2023 at 03:18:49PM -0600, Jerry Ray wrote:
> +static void lan9303_phylink_get_caps(struct dsa_switch *ds, int port,
> +				     struct phylink_config *config)
> +{
> +	struct lan9303 *chip = ds->priv;
> +
> +	dev_dbg(chip->dev, "%s(%d) entered.", __func__, port);
> +
> +	config->mac_capabilities = MAC_10 | MAC_100 | MAC_ASYM_PAUSE |
> +				   MAC_SYM_PAUSE;

You indicate that pause modes are supported, but...

> +static void lan9303_phylink_mac_link_up(struct dsa_switch *ds, int port,
> +					unsigned int mode,
> +					phy_interface_t interface,
> +					struct phy_device *phydev, int speed,
> +					int duplex, bool tx_pause,
> +					bool rx_pause)
> +{
> +	u32 ctl;
> +
> +	/* On this device, we are only interested in doing something here if
> +	 * this is the xMII port. All other ports are 10/100 phys using MDIO
> +	 * to control there link settings.
> +	 */
> +	if (port != 0)
> +		return;
> +
> +	ctl = lan9303_phy_read(ds, port, MII_BMCR);
> +
> +	ctl &= ~BMCR_ANENABLE;
> +
> +	if (speed == SPEED_100)
> +		ctl |= BMCR_SPEED100;
> +	else if (speed == SPEED_10)
> +		ctl &= ~BMCR_SPEED100;
> +	else
> +		dev_err(ds->dev, "unsupported speed: %d\n", speed);
> +
> +	if (duplex == DUPLEX_FULL)
> +		ctl |= BMCR_FULLDPLX;
> +	else
> +		ctl &= ~BMCR_FULLDPLX;
> +
> +	lan9303_phy_write(ds, port, MII_BMCR, ctl);

There is no code here to program the resolved pause modes. Is it handled
internally within the switch? (Please add a comment to this effect
either in get_caps or here.)

Thanks.

-- 
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