linux-kernel - Re: [PATCH net-next] net: phy: adin: allow control of Fast Link Down

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Message-ID: <f40f9c163f094a60443516f1744c8d09b4dc10ca.camel@gmail.com>
Date:   Tue, 28 Nov 2023 10:09:24 +0100
From:   Nuno Sá <noname.nuno@...il.com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...s.com
Subject: Re: [PATCH net-next] net: phy: adin: allow control of Fast Link Down

On Mon, 2023-11-27 at 16:31 +0100, Vincent Whitchurch wrote:
> Add support to allow Fast Link Down (aka "Enhanced link detection") to
> be controlled via the ETHTOOL_PHY_FAST_LINK_DOWN tunable.  These PHYs
> have this feature enabled by default.
> 
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---

LGTM,

Acked-by: Nuno Sa <nuno.sa@...log.com>

Thanks!
- Nuno Sá

>  drivers/net/phy/adin.c | 53
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/drivers/net/phy/adin.c b/drivers/net/phy/adin.c
> index 134637584a83..2e1a46e121d9 100644
> --- a/drivers/net/phy/adin.c
> +++ b/drivers/net/phy/adin.c
> @@ -68,6 +68,24 @@
>  #define ADIN1300_EEE_CAP_REG			0x8000
>  #define ADIN1300_EEE_ADV_REG			0x8001
>  #define ADIN1300_EEE_LPABLE_REG			0x8002
> +
> +#define ADIN1300_FLD_EN_REG			0x8E27
> +#define   ADIN1300_FLD_PCS_ERR_100_EN		BIT(7)
> +#define   ADIN1300_FLD_PCS_ERR_1000_EN		BIT(6)
> +#define   ADIN1300_FLD_SLCR_OUT_STUCK_100_EN	BIT(5)
> +#define   ADIN1300_FLD_SLCR_OUT_STUCK_1000_EN	BIT(4)
> +#define   ADIN1300_FLD_SLCR_IN_ZDET_100_EN	BIT(3)
> +#define   ADIN1300_FLD_SLCR_IN_ZDET_1000_EN	BIT(2)
> +#define   ADIN1300_FLD_SLCR_IN_INVLD_100_EN	BIT(1)
> +#define   ADIN1300_FLD_SLCR_IN_INVLD_1000_EN	BIT(0)
> +/* These bits are the ones which are enabled by default. */
> +#define ADIN1300_FLD_EN_ON	\
> +	(ADIN1300_FLD_SLCR_OUT_STUCK_100_EN | \
> +	 ADIN1300_FLD_SLCR_OUT_STUCK_1000_EN | \
> +	 ADIN1300_FLD_SLCR_IN_ZDET_100_EN | \
> +	 ADIN1300_FLD_SLCR_IN_ZDET_1000_EN | \
> +	 ADIN1300_FLD_SLCR_IN_INVLD_1000_EN)
> +
>  #define ADIN1300_CLOCK_STOP_REG			0x9400
>  #define ADIN1300_LPI_WAKE_ERR_CNT_REG		0xa000
>  
> @@ -416,6 +434,37 @@ static int adin_set_edpd(struct phy_device *phydev, u16
> tx_interval)
>  			  val);
>  }
>  
> +static int adin_get_fast_down(struct phy_device *phydev, u8 *msecs)
> +{
> +	int reg;
> +
> +	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_FLD_EN_REG);
> +	if (reg < 0)
> +		return reg;
> +
> +	if (reg & ADIN1300_FLD_EN_ON)
> +		*msecs = ETHTOOL_PHY_FAST_LINK_DOWN_ON;
> +	else
> +		*msecs = ETHTOOL_PHY_FAST_LINK_DOWN_OFF;
> +
> +	return 0;
> +}
> +
> +static int adin_set_fast_down(struct phy_device *phydev, const u8 *msecs)
> +{
> +	if (*msecs == ETHTOOL_PHY_FAST_LINK_DOWN_ON)
> +		return phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
> +					ADIN1300_FLD_EN_REG,
> +					ADIN1300_FLD_EN_ON);
> +
> +	if (*msecs == ETHTOOL_PHY_FAST_LINK_DOWN_OFF)
> +		return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
> +					  ADIN1300_FLD_EN_REG,
> +					  ADIN1300_FLD_EN_ON);
> +
> +	return -EINVAL;
> +}
> +
>  static int adin_get_tunable(struct phy_device *phydev,
>  			    struct ethtool_tunable *tuna, void *data)
>  {
> @@ -424,6 +473,8 @@ static int adin_get_tunable(struct phy_device *phydev,
>  		return adin_get_downshift(phydev, data);
>  	case ETHTOOL_PHY_EDPD:
>  		return adin_get_edpd(phydev, data);
> +	case ETHTOOL_PHY_FAST_LINK_DOWN:
> +		return adin_get_fast_down(phydev, data);
>  	default:
>  		return -EOPNOTSUPP;
>  	}
> @@ -437,6 +488,8 @@ static int adin_set_tunable(struct phy_device *phydev,
>  		return adin_set_downshift(phydev, *(const u8 *)data);
>  	case ETHTOOL_PHY_EDPD:
>  		return adin_set_edpd(phydev, *(const u16 *)data);
> +	case ETHTOOL_PHY_FAST_LINK_DOWN:
> +		return adin_set_fast_down(phydev, data);
>  	default:
>  		return -EOPNOTSUPP;
>  	}
> 
> ---
> base-commit: e1df5202e879bce09845ac62bae30206e1edfb80
> change-id: 20231127-adin-fld-c072c3b79a5a
> 
> Best regards,