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Date:   Tue, 6 Dec 2022 21:32:24 +0200
From:   Vladimir Oltean <olteanv@gmail.com>
To:     Jerry Ray <jerry.ray@microchip.com>
Cc:     Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux@armlinux.org.uk
Subject: Re: [PATCH net-next v3 2/2] dsa: lan9303: Move to PHYLINK
Message-ID: <20221206193224.f3obnsjtphbxole4@skbuf>
References: <20221206183500.6898-1-jerry.ray@microchip.com>
 <20221206183500.6898-1-jerry.ray@microchip.com>
 <20221206183500.6898-3-jerry.ray@microchip.com>
 <20221206183500.6898-3-jerry.ray@microchip.com>
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In-Reply-To: <20221206183500.6898-3-jerry.ray@microchip.com>
 <20221206183500.6898-3-jerry.ray@microchip.com>
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On Tue, Dec 06, 2022 at 12:35:00PM -0600, Jerry Ray wrote:
> This patch replaces the .adjust_link api with the .phylink_get_caps api.

Am I supposed to read this commit description and understand what the
change does?

You can't "replace" adjust_link with phylink_get_caps, since they don't
do the same thing. The equivalent set of operations are roughly
phylink_mac_config and phylink_mac_link_up, probably just the latter in
your case.

By deleting adjust_link and not replacing with any of the above, the
change is telling me that nothing from adjust_link was needed?

> 
> Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
> ---
> v2-> v3:
>   Added back in disabling Turbo Mode on the CPU MII interface.
>   Removed the unnecessary clearing of the phy supported interfaces.
> ---
>  drivers/net/dsa/lan9303-core.c | 79 ++++++++++++++++++----------------
>  1 file changed, 42 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
> index baa336bb9d15..c6236b328ed8 100644
> --- a/drivers/net/dsa/lan9303-core.c
> +++ b/drivers/net/dsa/lan9303-core.c
> @@ -886,6 +886,13 @@ static int lan9303_check_device(struct lan9303 *chip)
>  		return ret;
>  	}
>  
> +	/* Virtual Phy: Always disable Turbo 200Mbit mode */
> +	ret = lan9303_read(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, &reg);
> +	if (ret)
> +		return ret;
> +	reg &= ~LAN9303_VIRT_SPECIAL_TURBO;
> +	regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg);

Separate patch which moves this, please.

> +
>  	return 0;
>  }
>  
> @@ -1047,42 +1054,6 @@ 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_adjust_link(struct dsa_switch *ds, int port,
> -				struct phy_device *phydev)
> -{
> -	struct lan9303 *chip = ds->priv;
> -	int ctl;
> -
> -	if (!phy_is_pseudo_fixed_link(phydev))
> -		return;
> -
> -	ctl = lan9303_phy_read(ds, port, MII_BMCR);
> -
> -	ctl &= ~BMCR_ANENABLE;
> -
> -	if (phydev->speed == SPEED_100)
> -		ctl |= BMCR_SPEED100;
> -	else if (phydev->speed == SPEED_10)
> -		ctl &= ~BMCR_SPEED100;
> -	else
> -		dev_err(ds->dev, "unsupported speed: %d\n", phydev->speed);
> -
> -	if (phydev->duplex == DUPLEX_FULL)
> -		ctl |= BMCR_FULLDPLX;
> -	else
> -		ctl &= ~BMCR_FULLDPLX;
> -
> -	lan9303_phy_write(ds, port, MII_BMCR, ctl);

Are you going to explain why modifying this register is no longer needed?

> -
> -	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,
>  			       struct phy_device *phy)
>  {
> @@ -1279,6 +1250,40 @@ static int lan9303_port_mdb_del(struct dsa_switch *ds, int port,
>  	return 0;
>  }
>  
> +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 (dsa_port_is_cpu(dsa_to_port(ds, port))) {
> +		/* cpu port */

This comment and the "internal ports" are absolutely redundant, they
bring nothing to the understanding of the code.

> +		__set_bit(PHY_INTERFACE_MODE_RMII,
> +			  config->supported_interfaces);
> +		__set_bit(PHY_INTERFACE_MODE_MII,
> +			  config->supported_interfaces);
> +	} else {
> +		/* internal ports */
> +		__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;
> +}
> +
>  /* For non-cpu ports, the max frame size is 1518.
>   * The CPU port supports a max frame size of 1522.
>   * There is a JUMBO flag to make the max size 2048, but this driver
> @@ -1304,7 +1309,7 @@ static const struct dsa_switch_ops lan9303_switch_ops = {
>  	.get_strings = lan9303_get_strings,
>  	.phy_read = lan9303_phy_read,
>  	.phy_write = lan9303_phy_write,
> -	.adjust_link = lan9303_adjust_link,
> +	.phylink_get_caps	= lan9303_phylink_get_caps,

Some of the lan9303_switch_ops are not aligned, and some are aligned
with spaces. None with tabs. Please be consistent with something that
exists, or create a preparatory patch which brings some more consistence
with the way in which you want things to be.

>  	.get_ethtool_stats = lan9303_get_ethtool_stats,
>  	.get_sset_count = lan9303_get_sset_count,
>  	.port_enable = lan9303_port_enable,
> -- 
> 2.17.1
>