linux-kernel - Re: [PATCH net-next V1 2/2] net: phy: micrel: Add PHY Auto/MDI/MDI-X set driver for KSZ9131

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Date:   Mon, 24 Oct 2022 11:56:59 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
        <linux-kernel@...r.kernel.org>, <bryan.whitehead@...rochip.com>,
        <hkallweit1@...il.com>, <pabeni@...hat.com>, <edumazet@...gle.com>,
        <linux@...linux.org.uk>, <UNGLinuxDriver@...rochip.com>,
        <andrew@...n.ch>, <Ian.Saturley@...rochip.com>
Subject: Re: [PATCH net-next V1 2/2] net: phy: micrel: Add PHY Auto/MDI/MDI-X
 set driver for KSZ9131

The 10/24/2022 13:55, Raju Lakkaraju wrote:
> Add support for MDI-X status and configuration for KSZ9131 chips

Reviewed-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

> 
> Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
> ---
> Change List:
> ============
> V0 -> V1:
>  - Drop the "_" from the end of the macros
>  - Add KSZ9131 MDI-X specific register contain 9131 in macro names 
> 
>  drivers/net/phy/micrel.c | 77 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 54a17b576eac..26ce0c5defcd 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -1295,6 +1295,81 @@ static int ksz9131_config_init(struct phy_device *phydev)
>  	return 0;
>  }
>  
> +#define MII_KSZ9131_AUTO_MDIX		0x1C
> +#define MII_KSZ9131_AUTO_MDI_SET	BIT(7)
> +#define MII_KSZ9131_AUTO_MDIX_SWAP_OFF	BIT(6)
> +
> +static int ksz9131_mdix_update(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	ret = phy_read(phydev, MII_KSZ9131_AUTO_MDIX);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ret & MII_KSZ9131_AUTO_MDIX_SWAP_OFF) {
> +		if (ret & MII_KSZ9131_AUTO_MDI_SET)
> +			phydev->mdix_ctrl = ETH_TP_MDI;
> +		else
> +			phydev->mdix_ctrl = ETH_TP_MDI_X;
> +	} else {
> +		phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
> +	}
> +
> +	if (ret & MII_KSZ9131_AUTO_MDI_SET)
> +		phydev->mdix = ETH_TP_MDI;
> +	else
> +		phydev->mdix = ETH_TP_MDI_X;
> +
> +	return 0;
> +}
> +
> +static int ksz9131_config_mdix(struct phy_device *phydev, u8 ctrl)
> +{
> +	u16 val;
> +
> +	switch (ctrl) {
> +	case ETH_TP_MDI:
> +		val = MII_KSZ9131_AUTO_MDIX_SWAP_OFF |
> +		      MII_KSZ9131_AUTO_MDI_SET;
> +		break;
> +	case ETH_TP_MDI_X:
> +		val = MII_KSZ9131_AUTO_MDIX_SWAP_OFF;
> +		break;
> +	case ETH_TP_MDI_AUTO:
> +		val = 0;
> +		break;
> +	default:
> +		return 0;
> +	}
> +
> +	return phy_modify(phydev, MII_KSZ9131_AUTO_MDIX,
> +			  MII_KSZ9131_AUTO_MDIX_SWAP_OFF |
> +			  MII_KSZ9131_AUTO_MDI_SET, val);
> +}
> +
> +static int ksz9131_read_status(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	ret = ksz9131_mdix_update(phydev);
> +	if (ret < 0)
> +		return ret;
> +
> +	return genphy_read_status(phydev);
> +}
> +
> +static int ksz9131_config_aneg(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	ret = ksz9131_config_mdix(phydev, phydev->mdix_ctrl);
> +	if (ret)
> +		return ret;
> +
> +	return genphy_config_aneg(phydev);
> +}
> +
>  #define KSZ8873MLL_GLOBAL_CONTROL_4	0x06
>  #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX	BIT(6)
>  #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED	BIT(4)
> @@ -3304,6 +3379,8 @@ static struct phy_driver ksphy_driver[] = {
>  	.probe		= kszphy_probe,
>  	.config_init	= ksz9131_config_init,
>  	.config_intr	= kszphy_config_intr,
> +	.config_aneg	= ksz9131_config_aneg,
> +	.read_status	= ksz9131_read_status,
>  	.handle_interrupt = kszphy_handle_interrupt,
>  	.get_sset_count = kszphy_get_sset_count,
>  	.get_strings	= kszphy_get_strings,
> -- 
> 2.25.1
> 

-- 
/Horatiu