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

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Date:   Tue, 3 Oct 2023 22:45:45 +0200
From:   Paweł Dembicki <paweldembicki@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        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

śr., 27 wrz 2023 o 01:03 Vladimir Oltean <olteanv@...il.com> napisał(a):
>
> 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/

I plan to make rgmii delays configurable from the device tree. Should I?
a. switch to phy_interface_is_rgmii in the current patch?
b. add another patch in this series?
c. wait with change to phy_interface_is_rgmii for patch with rgmii
delays configuration?