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

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Message-ID: <20230926230346.xgdsifdnka2iawiz@skbuf>
Date:   Wed, 27 Sep 2023 02:03:46 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Pawel Dembicki <paweldembicki@...il.com>,
        "Russell King (Oracle)" <linux@...linux.org.uk>
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>,
        "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 05:49:36PM +0100, Russell King (Oracle) wrote:
> 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.
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

I also agree with adding one more patch to this which converts to
phy_interface_is_rgmii(). Paweł: there was a recent discussion about
the (ir)relevance of the specific rgmii phy-mode in fixed-link here.
https://lore.kernel.org/netdev/ZNpEaMJjmDqhK1dW@shell.armlinux.org.uk/