netdev - Re: [PATCH net-next v2 07/10] r8169: migrate speed

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Date:   Tue, 10 Jul 2018 23:40:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 07/10] r8169: migrate speed_down function to
 phylib

On Tue, Jul 10, 2018 at 11:26:13PM +0200, Heiner Kallweit wrote:
> On 10.07.2018 22:44, Andrew Lunn wrote:
> >>  static void rtl_speed_down(struct rtl8169_private *tp)
> >>  {
> >> -	u32 adv;
> >> -	int lpa;
> >> +	struct phy_device *phydev = tp->dev->phydev;
> >> +	u32 adv = phydev->lp_advertising & phydev->supported;
> >>  
> >> -	rtl_writephy(tp, 0x1f, 0x0000);
> >> -	lpa = rtl_readphy(tp, MII_LPA);
> >> +	if (adv & BASET10)
> >> +		phydev->advertising &= ~(BASET100 | BASET1000);
> >> +	else if (adv & BASET100)
> >> +		phydev->advertising &= ~BASET1000;
> > 
> > Please use phy_set_max_speed(). We need MAC drivers to stop directly
> > accessing phydev members. Otherwise we are going to have problems
> > supporting 2.5G PHYs.
> > 
> The issue I see with phy_set_max_speed() is that it also adjusts
> phydev->supported and I don't think that's what we want.
> What the chip supports doesn't change, just what we want to
> advertise.

True.

Which is one more reason to do it inside phylib.

      Andrew