linux-kernel - Re: [PATCH v3 07/13] net: phy: add qca8081 get

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Date:   Wed, 20 Oct 2021 14:20:20 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jie Luo <quic_luoj@...cinc.com>
Cc:     Luo Jie <luoj@...eaurora.org>, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        sricharan@...eaurora.org
Subject: Re: [PATCH v3 07/13] net: phy: add qca8081 get_features

On Wed, Oct 20, 2021 at 02:39:57PM +0800, Jie Luo wrote:
> 
> On 10/19/2021 5:44 AM, Andrew Lunn wrote:
> > On Mon, Oct 18, 2021 at 11:33:27AM +0800, Luo Jie wrote:
> > > Reuse the at803x phy driver get_features excepting
> > > adding 2500M capability.
> > > 
> > > Signed-off-by: Luo Jie<luoj@...eaurora.org>
> > > ---
> > >   drivers/net/phy/at803x.c | 10 ++++++++++
> > >   1 file changed, 10 insertions(+)
> > > 
> > > diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> > > index 42d3f8ccca94..0c22ef735230 100644
> > > --- a/drivers/net/phy/at803x.c
> > > +++ b/drivers/net/phy/at803x.c
> > > @@ -719,6 +719,15 @@ static int at803x_get_features(struct phy_device *phydev)
> > >   	if (err)
> > >   		return err;
> > > +	if (phydev->drv->phy_id == QCA8081_PHY_ID) {
> > > +		err = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_NG_EXTABLE);
> > > +		if (err < 0)
> > > +			return err;
> > > +
> > > +		linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->supported,
> > > +				err & MDIO_PMA_NG_EXTABLE_2_5GBT);
> > > +	}
> > genphy_c45_pma_read_abilities()?
> > 
> > 	Andrew
> 
> Hi Andrew,
> 
> Thanks for this comment, if we use genphy_c45_pma_read_abilities here, the
> ETHTOOL_LINK_MODE_Autoneg_BIT
> 
> will be lost, since MDIO_MMD_AN.MDIO_STAT1 does not have bit
> MDIO_AN_STAT1_ABLE.
 
Yes, if your PHY breaks the standard, the helpers are not much use,
that assume standard compliment PHYs.

     Andrew