linux-kernel - Re: [PATCH net-next v2 6/8] net: phy: at803x: Make SmartEEE support optional and configurable via ethtool

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Message-ID: <20230328120514.GF15196@pengutronix.de>
Date:   Tue, 28 Mar 2023 14:05:14 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Wei Fang <wei.fang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>
Cc:     kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Shenwei Wang <shenwei.wang@....com>,
        Clark Wang <xiaoning.wang@....com>,
        NXP Linux Team <linux-imx@....com>,
        Amit Cohen <amcohen@...dia.com>, Gal Pressman <gal@...dia.com>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next v2 6/8] net: phy: at803x: Make SmartEEE support
 optional and configurable via ethtool

On Mon, Mar 27, 2023 at 04:22:00PM +0200, Oleksij Rempel wrote:
> This commit makes SmartEEE support in the AR8035 PHY optional and
> configurable through the ethtool eee_set/get interface. Before this
> patch, SmartEEE was always enabled except when a device tree option was
> preventing it. Since EEE support not only provides advantages in power
> management, but can also uncover compatibility issues and other bugs, it
> is beneficial to allow users to control this functionality.
> 
> By making SmartEEE support optional and configurable via ethtool, the
> at803x driver can adapt to different MAC configurations and properly
> handle EEE and LPI features. This flexibility empowers users to manage
> the trade-offs between power management, compatibility, and overall
> performance as needed.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/phy/at803x.c | 126 ++++++++++++++++++++++++++++++++++++---
>  1 file changed, 118 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index 653d27a2e62b..4f65b3ebf806 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -165,8 +165,18 @@
>  
>  #define AT803X_MMD3_SMARTEEE_CTL1		0x805b
>  #define AT803X_MMD3_SMARTEEE_CTL2		0x805c
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_LOW	GENMASK(15, 0)
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_15_0	GENMASK(15, 0)
>  #define AT803X_MMD3_SMARTEEE_CTL3		0x805d
>  #define AT803X_MMD3_SMARTEEE_CTL3_LPI_EN	BIT(8)
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_HIGH	GENMASK(7, 0)
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_23_16	GENMASK(23, 16)
> +/* Tx LPI timer resolution */
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_RESOL_NS	163840
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_MAX_US	\
> +	((GENMASK(23, 0) * AT803X_MMD3_SMARTEEE_LPI_TIME_RESOL_NS) / \
> +	       NSEC_PER_USEC)
> +#define AT803X_MMD3_SMARTEEE_LPI_TIME_DEF_US	335544
>  
>  #define ATH9331_PHY_ID				0x004dd041
>  #define ATH8030_PHY_ID				0x004dd076
> @@ -302,6 +312,8 @@ struct at803x_priv {
>  	u8 smarteee_lpi_tw_100m;
>  	bool is_fiber;
>  	bool is_1000basex;
> +	bool tx_lpi_on;

@Andrew, this variable can be replace by your phydev->tx_lpi_enabled
variable. Should I wait for your patches went mainline?

Regards,
Oleksij
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