netdev - RE: [PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

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Date:   Mon, 16 Jan 2023 17:33:06 +0000
From:   <Jerry.Ray@...rochip.com>
To:     <Arun.Ramadoss@...rochip.com>, <olteanv@...il.com>,
        <andrew@...n.ch>, <linux-kernel@...r.kernel.org>,
        <linux@...linux.org.uk>, <f.fainelli@...il.com>, <kuba@...nel.org>,
        <edumazet@...gle.com>, <pabeni@...hat.com>, <jbe@...gutronix.de>,
        <netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: RE: [PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

> > diff --git a/drivers/net/dsa/lan9303-core.c
> > b/drivers/net/dsa/lan9303-core.c
> > index 7be4c491e5d9..e514fff81af6 100644
> > --- a/drivers/net/dsa/lan9303-core.c
> > +++ b/drivers/net/dsa/lan9303-core.c
> > @@ -1058,37 +1058,6 @@ static int lan9303_phy_write(struct dsa_switch
> > *ds, int phy, int regnum,
> >  	return chip->ops->phy_write(chip, phy, regnum, val);
> >  }
> >    
> > +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;
> > +
> > +	if (port == 0) {
> > +		__set_bit(PHY_INTERFACE_MODE_RMII,
> > +			  config->supported_interfaces);
> > +		__set_bit(PHY_INTERFACE_MODE_MII,
> > +			  config->supported_interfaces);
> > +	} else {
> > +		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
> > +			  config->supported_interfaces);
> > +		/* Compatibility for phylib's default interface type
> > when the
> > +		 * phy-mode property is absent
> > +		 */
> > +		__set_bit(PHY_INTERFACE_MODE_GMII,
> > +			  config->supported_interfaces);
> > +	}
> > +
> > +	/* This driver does not make use of the speed, duplex, pause or
> > the
> > +	 * advertisement in its mac_config, so it is safe to mark this
> > driver
> > +	 * as non-legacy.
> > +	 */
> > +	config->legacy_pre_march2020 = false;
> > +}
> > +
> > +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);
> 
> I think, We will not reach in the error part, since in the
> phylink_get_caps we specified only 10 and 100 Mbps speed. Phylink layer
> will validate and if the value is beyond the speed supported, it will 
> return back.
> 

I will remove the error check and will go with either 10 or 100.
	ctl &= ~BMCR_SPEED100;
	if ((speed == SPEED_100)
		ctl |= BMCR_SPEED100;

Regards,
Jerry.

> > +
> > +	if (duplex == DUPLEX_FULL)
> > +		ctl |= BMCR_FULLDPLX;
> > +	else
> > +		ctl &= ~BMCR_FULLDPLX;
> > +
> > +	lan9303_phy_write(ds, port, MII_BMCR, ctl);
> > +}
> > +