netdev - Re: [PATCH net-next 0/9] net: add phylink managed EEE support

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Message-ID: <Z44dOlfRN5FmHcdS@shell.armlinux.org.uk>
Date: Mon, 20 Jan 2025 09:54:02 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: 'Andrew Lunn' <andrew@...n.ch>,
	'Heiner Kallweit' <hkallweit1@...il.com>, mengyuanlou@...-swift.com,
	'Alexandre Torgue' <alexandre.torgue@...s.st.com>,
	'Andrew Lunn' <andrew+netdev@...n.ch>,
	'Bryan Whitehead' <bryan.whitehead@...rochip.com>,
	"'David S. Miller'" <davem@...emloft.net>,
	'Eric Dumazet' <edumazet@...gle.com>,
	'Jakub Kicinski' <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	'Marcin Wojtas' <marcin.s.wojtas@...il.com>,
	'Maxime Coquelin' <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org, 'Paolo Abeni' <pabeni@...hat.com>,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next 0/9] net: add phylink managed EEE support

On Mon, Jan 20, 2025 at 09:51:29AM +0800, Jiawen Wu wrote:
> On Fri, Jan 17, 2025 8:24 PM, Russell King (Oracle) wrote:
> > On Fri, Jan 17, 2025 at 06:17:05PM +0800, Jiawen Wu wrote:
> > > > > Since merging these patches, phylink_connect_phy() can no longer be
> > > > > invoked correctly in ngbe_open(). The error is returned from the function
> > > > > phy_eee_rx_clock_stop(). Since EEE is not supported on our NGBE hardware.
> > > >
> > > > That would mean phy_modify_mmd() is failing, but the question is why
> > > > that is. Please investigate. Thanks.
> > >
> > > Yes, phy_modify_mmd() returns -EOPNOTSUPP. Since .read/write_mmd are
> > > implemented in the PHY driver, but it's not supported to read/write the
> > > register field (devnum=MDIO_MMD_PCS, regnum= MDIO_CTRL1).
> > >
> > > So the error occurs on  __phy_read_mmd():
> > > 	if (phydev->drv && phydev->drv->read_mmd)
> > > 		return phydev->drv->read_mmd(phydev, devad, regnum);
> > 
> > Thanks. The patch below should fix it. Please test, meanwhile I'll
> > prepare a proper patch.
> > 
> > diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> > index 66eea3f963d3..56d411bb2547 100644
> > --- a/drivers/net/phy/phylink.c
> > +++ b/drivers/net/phy/phylink.c
> > @@ -2268,7 +2268,11 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
> >  	/* Explicitly configure whether the PHY is allowed to stop it's
> >  	 * receive clock.
> >  	 */
> > -	return phy_eee_rx_clock_stop(phy, pl->config->eee_rx_clk_stop_enable);
> > +	ret = phy_eee_rx_clock_stop(phy, pl->config->eee_rx_clk_stop_enable);
> > +	if (ret == -EOPNOTSUPP)
> > +		ret = 0;
> > +
> > +	return ret;
> >  }
> > 
> >  static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
> 
> Test pass.
> Thanks.

Thanks, I guess that's a tested-by then?

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