linux-kernel - Re: [PATCH net-next] net: phy: micrel: lan8814: Enable in-band auto-negotiation

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Message-ID: <b74e7d46-630a-412b-a92c-374d1495758b@bootlin.com>
Date: Fri, 14 Nov 2025 10:21:06 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Horatiu Vultur <horatiu.vultur@...rochip.com>, andrew@...n.ch,
 hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: micrel: lan8814: Enable in-band
 auto-negotiation

Hi Horatiu,

On 14/11/2025 09:42, Horatiu Vultur wrote:
> The lan8814 supports two interfaces towards the host (QSGMII and QUSGMII).
> Currently the lan8814 disables the auto-negotiation towards the host
> side. So, extend this to allow to configure to use in-band
> auto-negotiation.
> I have tested this only with the QSGMII interface.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>

Maxime

> ---
>  drivers/net/phy/micrel.c | 26 +++++++++++++++++++++-----
>  1 file changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 57ea947369fed..5d90ccc20df75 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -2988,6 +2988,8 @@ static int ksz886x_cable_test_get_status(struct phy_device *phydev,
>  #define LAN_EXT_PAGE_ACCESS_ADDRESS_DATA		0x17
>  #define LAN_EXT_PAGE_ACCESS_CTRL_EP_FUNC		0x4000
>  
> +#define LAN8814_QSGMII_TX_CONFIG			0x35
> +#define LAN8814_QSGMII_TX_CONFIG_QSGMII			BIT(3)
>  #define LAN8814_QSGMII_SOFT_RESET			0x43
>  #define LAN8814_QSGMII_SOFT_RESET_BIT			BIT(0)
>  #define LAN8814_QSGMII_PCS1G_ANEG_CONFIG		0x13
> @@ -4501,12 +4503,24 @@ static void lan8814_setup_led(struct phy_device *phydev, int val)
>  static int lan8814_config_init(struct phy_device *phydev)
>  {
>  	struct kszphy_priv *lan8814 = phydev->priv;
> +	int ret;
>  
> -	/* Disable ANEG with QSGMII PCS Host side */
> -	lanphy_modify_page_reg(phydev, LAN8814_PAGE_PORT_REGS,
> -			       LAN8814_QSGMII_PCS1G_ANEG_CONFIG,
> -			       LAN8814_QSGMII_PCS1G_ANEG_CONFIG_ANEG_ENA,
> -			       0);
> +	/* Based on the interface type select how the advertise ability is
> +	 * encoded, to set as SGMII or as USGMII.
> +	 */
> +	if (phydev->interface == PHY_INTERFACE_MODE_QSGMII)
> +		ret = lanphy_modify_page_reg(phydev, LAN8814_PAGE_COMMON_REGS,
> +					     LAN8814_QSGMII_TX_CONFIG,
> +					     LAN8814_QSGMII_TX_CONFIG_QSGMII,
> +					     LAN8814_QSGMII_TX_CONFIG_QSGMII);
> +	else
> +		ret = lanphy_modify_page_reg(phydev, LAN8814_PAGE_COMMON_REGS,
> +					     LAN8814_QSGMII_TX_CONFIG,
> +					     LAN8814_QSGMII_TX_CONFIG_QSGMII,
> +					     0);
> +
> +	if (ret < 0)
> +		return ret;
>  
>  	/* MDI-X setting for swap A,B transmit */
>  	lanphy_modify_page_reg(phydev, LAN8814_PAGE_PCS_DIGITAL, LAN8814_ALIGN_SWAP,
> @@ -6640,6 +6654,8 @@ static struct phy_driver ksphy_driver[] = {
>  	.suspend	= genphy_suspend,
>  	.resume		= kszphy_resume,
>  	.config_intr	= lan8814_config_intr,
> +	.inband_caps	= lan8842_inband_caps,
> +	.config_inband	= lan8842_config_inband,
>  	.handle_interrupt = lan8814_handle_interrupt,
>  	.cable_test_start	= lan8814_cable_test_start,
>  	.cable_test_get_status	= ksz886x_cable_test_get_status,