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Date:   Wed, 2 Sep 2020 13:16:45 -0500
From:   Dan Murphy <dmurphy@...com>
To:     <davem@...emloft.net>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <hkallweit1@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dp83869: Add ability to advertise Fiber
 connection


On 9/2/20 8:25 AM, Dan Murphy wrote:
> Add the ability to advertise the Fiber connection if the strap or the
> op-mode is configured for 100Base-FX.
>
> Auto negotiation is not supported on this PHY when in fiber mode.
>
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>   drivers/net/phy/dp83869.c | 35 +++++++++++++++++++++++++++++++++++
>   1 file changed, 35 insertions(+)
>
> diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
> index 58103152c601..1acf498832f1 100644
> --- a/drivers/net/phy/dp83869.c
> +++ b/drivers/net/phy/dp83869.c
> @@ -52,6 +52,11 @@
>   					 BMCR_FULLDPLX | \
>   					 BMCR_SPEED1000)
>   
> +#define MII_DP83869_FIBER_ADVERTISE    (ADVERTISED_TP | ADVERTISED_MII | \
> +					ADVERTISED_FIBRE | ADVERTISED_BNC |  \
> +					ADVERTISED_Pause | ADVERTISED_Asym_Pause | \
> +					ADVERTISED_100baseT_Full)
> +
>   /* This is the same bit mask as the BMCR so re-use the BMCR default */
>   #define DP83869_FX_CTRL_DEFAULT	MII_DP83869_BMCR_DEFAULT
>   
> @@ -300,6 +305,7 @@ static int dp83869_configure_mode(struct phy_device *phydev,
>   {
>   	int phy_ctrl_val;
>   	int ret;
> +	int bmcr;
>   
>   	if (dp83869->mode < DP83869_RGMII_COPPER_ETHERNET ||
>   	    dp83869->mode > DP83869_SGMII_COPPER_ETHERNET)
> @@ -383,7 +389,36 @@ static int dp83869_configure_mode(struct phy_device *phydev,
>   
>   		break;
>   	case DP83869_RGMII_1000_BASE:
> +		break;
>   	case DP83869_RGMII_100_BASE:
> +		/* Only allow advertising what this PHY supports */
> +		linkmode_and(phydev->advertising, phydev->advertising,
> +			     phydev->supported);
> +
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT,
> +				 phydev->supported);
> +		linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT,
> +				 phydev->advertising);
> +
> +		/* Auto neg is not supported in fiber mode */
> +		bmcr = phy_read(phydev, MII_BMCR);
> +		if (bmcr < 0)
> +			return bmcr;
> +
> +		phydev->autoneg = AUTONEG_DISABLE;
> +		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
> +				   phydev->supported);
> +		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
> +				   phydev->advertising);
> +
> +		if (bmcr & BMCR_ANENABLE) {
> +			ret =  phy_modify(phydev, MII_BMCR, BMCR_ANENABLE, 0);
> +			if (ret < 0)
> +				return ret;
> +		}
> +		ret = phy_modify_changed(phydev, MII_ADVERTISE,
> +					 MII_DP83869_FIBER_ADVERTISE,
> +					 MII_DP83869_FIBER_ADVERTISE);

This is not correct after some testing find that this fails to init 
since ret will be non-zero on success

Dan

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