linux-kernel - Re: [PATCH 14/16] net: phy: adin: make sure down-speed auto-neg is enabled

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Date:   Tue, 6 Aug 2019 06:53:24 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "andrew@...n.ch" <andrew@...n.ch>
Subject: Re: [PATCH 14/16] net: phy: adin: make sure down-speed auto-neg is
 enabled

On Tue, 2019-08-06 at 07:52 +0200, Heiner Kallweit wrote:
> [External]
> 
> On 05.08.2019 18:54, Alexandru Ardelean wrote:
> > Down-speed auto-negotiation may not always be enabled, in which case the
> > PHY won't down-shift to 100 or 10 during auto-negotiation.
> > 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > ---
> >  drivers/net/phy/adin.c | 27 +++++++++++++++++++++++++++
> >  1 file changed, 27 insertions(+)
> > 
> > diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
> > index 86848444bd98..a1f3456a8504 100644
> > --- a/drivers/net/phy/adin.c
> > +++ b/drivers/net/phy/adin.c
> > @@ -32,6 +32,13 @@
> >  #define   ADIN1300_NRG_PD_TX_EN			BIT(2)
> >  #define   ADIN1300_NRG_PD_STATUS		BIT(1)
> >  
> > +#define ADIN1300_PHY_CTRL2			0x0016
> > +#define   ADIN1300_DOWNSPEED_AN_100_EN		BIT(11)
> > +#define   ADIN1300_DOWNSPEED_AN_10_EN		BIT(10)
> > +#define   ADIN1300_GROUP_MDIO_EN		BIT(6)
> > +#define   ADIN1300_DOWNSPEEDS_EN	\
> > +	(ADIN1300_DOWNSPEED_AN_100_EN | ADIN1300_DOWNSPEED_AN_10_EN)
> > +
> >  #define ADIN1300_INT_MASK_REG			0x0018
> >  #define   ADIN1300_INT_MDIO_SYNC_EN		BIT(9)
> >  #define   ADIN1300_INT_ANEG_STAT_CHNG_EN	BIT(8)
> > @@ -425,6 +432,22 @@ static int adin_config_mdix(struct phy_device *phydev)
> >  	return phy_write(phydev, ADIN1300_PHY_CTRL1, reg);
> >  }
> >  
> > +static int adin_config_downspeeds(struct phy_device *phydev)
> > +{
> > +	int reg;
> > +
> > +	reg = phy_read(phydev, ADIN1300_PHY_CTRL2);
> > +	if (reg < 0)
> > +		return reg;
> > +
> > +	if ((reg & ADIN1300_DOWNSPEEDS_EN) == ADIN1300_DOWNSPEEDS_EN)
> > +		return 0;
> > +
> > +	reg |= ADIN1300_DOWNSPEEDS_EN;
> > +
> > +	return phy_write(phydev, ADIN1300_PHY_CTRL2, reg);
> 
> Using phy_set_bits() would be easier.

ack;
missed this;

thanks

> 
> > +}
> > +
> >  static int adin_config_aneg(struct phy_device *phydev)
> >  {
> >  	int ret;
> > @@ -433,6 +456,10 @@ static int adin_config_aneg(struct phy_device *phydev)
> >  	if (ret)
> >  		return ret;
> >  
> > +	ret = adin_config_downspeeds(phydev);
> > +	if (ret < 0)
> > +		return ret;
> > +
> >  	return genphy_config_aneg(phydev);
> >  }
> >  
> >