netdev - Re: [PATCH net-next v8 3/8] net: phy: Add helper to set EEE Clock stop enable bit

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Date: Sat, 2 Mar 2024 18:16:34 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Oleksij Rempel <o.rempel@...gutronix.de>, 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>, Russell King <linux@...linux.org.uk>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>, 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>
Subject: Re: [PATCH net-next v8 3/8] net: phy: Add helper to set EEE Clock
 stop enable bit

On 01.03.2024 11:01, Oleksij Rempel wrote:
> From: Andrew Lunn <andrew@...n.ch>
> 
> The MAC driver can request that the PHY stops the clock during EEE
> LPI. This has normally been does as part of phy_init_eee(), however
> that function is overly complex and often wrongly used. Add a
> standalone helper, to aid removing phy_init_eee().
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/phy/phy.c | 20 ++++++++++++++++++++
>  include/linux/phy.h   |  1 +
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> index 2bc0a7d51c63f..ab18b0d9beb47 100644
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
> @@ -1579,6 +1579,26 @@ void phy_mac_interrupt(struct phy_device *phydev)
>  }
>  EXPORT_SYMBOL(phy_mac_interrupt);
>  
> +/**
> + * phy_eee_clk_stop_enable - Clock should stop during LIP
> + * @phydev: target phy_device struct
> + *
> + * Description: Program the MMD register 3.0 setting the "Clock stop enable"
> + * bit.
> + */
> +int phy_eee_clk_stop_enable(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	mutex_lock(&phydev->lock);
> +	ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
> +			       MDIO_PCS_CTRL1_CLKSTOP_EN);
> +	mutex_unlock(&phydev->lock);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(phy_eee_clk_stop_enable);
> +
I don't see a user of this function in the series.
Based on the commit description, wouldn't it be better to
make this patch part of a future series removing
phy_init_eee()?

>  /**
>   * phy_init_eee - init and check the EEE feature
>   * @phydev: target phy_device struct
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index a880f6d7170ea..432c561f58098 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -1995,6 +1995,7 @@ int phy_unregister_fixup_for_id(const char *bus_id);
>  int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask);
>  
>  int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable);
> +int phy_eee_clk_stop_enable(struct phy_device *phydev);
>  int phy_get_eee_err(struct phy_device *phydev);
>  int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_keee *data);
>  int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_keee *data);