linux-kernel - Re: [PATCH net-next v3 2/8] net: dsa: vsc73xx: convert to PHYLINK

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Message-ID: <ZQCWoIjvAJZ1Qyii@shell.armlinux.org.uk>
Date:   Tue, 12 Sep 2023 17:49:36 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Pawel Dembicki <paweldembicki@...il.com>
Cc:     netdev@...r.kernel.org, Dan Carpenter <dan.carpenter@...aro.org>,
        Simon Horman <simon.horman@...igine.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        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>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/8] net: dsa: vsc73xx: convert to PHYLINK

On Tue, Sep 12, 2023 at 02:21:56PM +0200, Pawel Dembicki wrote:
> +static void vsc73xx_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)
> +{
> +	struct vsc73xx *vsc = ds->priv;
> +	u32 val;
> +
> +	if (speed == SPEED_1000)
> +		val = VSC73XX_MAC_CFG_GIGA_MODE | VSC73XX_MAC_CFG_TX_IPG_1000M;
> +	else
> +		val = VSC73XX_MAC_CFG_TX_IPG_100_10M;
> +
> +	if (interface == PHY_INTERFACE_MODE_RGMII)
> +		val |= VSC73XX_MAC_CFG_CLK_SEL_1000M;
> +	else
> +		val |= VSC73XX_MAC_CFG_CLK_SEL_EXT;

I know the original code tested against PHY_INTERFACE_MODE_RGMII, but
is this correct, or should it be:

	if (phy_interface_is_rgmii(interface))

since the various RGMII* modes are used to determine the delay on the
PHY side.

Even so, I don't think that is a matter for this patch, but a future
(or maybe a preceeding patch) to address.

Other than that, I think it looks okay.

Thanks.

-- 
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