netdev - RE: [PATCH v2 2/5] dpaa_eth: move of_phy

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Message-ID: <DB3PR0402MB3849B210D6DA612C31BA0C5AEC4F0@DB3PR0402MB3849.eurprd04.prod.outlook.com>
Date:   Mon, 16 Oct 2017 04:26:28 +0000
From:   Madalin-cristian Bucur <madalin.bucur@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "junote@...look.com" <junote@...look.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 2/5] dpaa_eth: move of_phy_connect() to the eth driver

> -----Original Message-----
> From: Andrew Lunn [mailto:andrew@...n.ch]
> Sent: Sunday, October 15, 2017 9:34 PM
> To: Madalin-cristian Bucur <madalin.bucur@....com>
> Cc: netdev@...r.kernel.org; davem@...emloft.net; f.fainelli@...il.com;
> vivien.didelot@...oirfairelinux.com; junote@...look.com; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH v2 2/5] dpaa_eth: move of_phy_connect() to the eth
> driver
> 
> On Fri, Oct 13, 2017 at 05:50:09PM +0300, Madalin Bucur wrote:
> > Signed-off-by: Madalin Bucur <madalin.bucur@....com>
> > ---
> >  drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 48 +++++++++++--
> >  drivers/net/ethernet/freescale/fman/mac.c      | 97 ++++++-------------
> -------
> >  drivers/net/ethernet/freescale/fman/mac.h      |  5 +-
> >  3 files changed, 66 insertions(+), 84 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > index 4225806..7cf61d6 100644
> > --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > @@ -2435,6 +2435,48 @@ static void dpaa_eth_napi_disable(struct
> dpaa_priv *priv)
> >  	}
> >  }
> >
> > +static void dpaa_adjust_link(struct net_device *net_dev)
> > +{
> > +	struct mac_device *mac_dev;
> > +	struct dpaa_priv *priv;
> > +
> > +	priv = netdev_priv(net_dev);
> > +	mac_dev = priv->mac_dev;
> > +	mac_dev->adjust_link(mac_dev);
> > +}
> > +
> > +static int dpaa_phy_init(struct net_device *net_dev)
> > +{
> > +	struct mac_device *mac_dev;
> > +	struct phy_device *phy_dev;
> > +	struct dpaa_priv *priv;
> > +
> > +	priv = netdev_priv(net_dev);
> > +	mac_dev = priv->mac_dev;
> > +
> > +	phy_dev = of_phy_connect(net_dev, mac_dev->phy_node,
> > +				 &dpaa_adjust_link, 0,
> > +				 mac_dev->phy_if);
> > +	if (!phy_dev) {
> > +		netif_err(priv, ifup, net_dev, "init_phy() failed\n");
> > +		return -ENODEV;
> > +	}
> > +
> > +	/* Remove any features not supported by the controller */
> > +	phy_dev->supported &= mac_dev->if_support;
> > +
> > +	/* Enable the symmetric and asymmetric PAUSE frame advertisements,
> > +	 * as most of the PHY drivers do not enable them by default.
> > +	 */
> 
> Hi Madalin
> 
> This is just moving code around, so the patch is O.K. However, it
> would be nice to have a followup patch. This comment is wrong. The phy
> driver should never enable symmetric and asymmetric PAUSE frames. The
> MAC needs to, because only the MAC knows if the MAC supports pause
> frames.
> 
> 	Andrew

Hi Andrew,

This is obsolete and it will be removed, I'll send a v3. It remained there from
a time it used to be valid (the original DPAA Ethernet driver was developed
and maintained out of tree since about 9 years ago). I see this thread on the
subject which is relatively recent:

https://www.spinics.net/lists/netdev/msg404288.html

Thanks,
Madalin