linux-kernel - Re: [PATCH net-next V4 5/5] net: lan743x: Add support to ethtool phylink get and set settings

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Message-ID: <9f74455e-45ec-495a-bc8e-1c61caab747c@lunn.ch>
Date: Fri, 30 Aug 2024 22:55:10 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, linux@...linux.org.uk,
	kuba@...nel.org, hkallweit1@...il.com, richardcochran@...il.com,
	rdunlap@...radead.org, Bryan.Whitehead@...rochip.com,
	edumazet@...gle.com, pabeni@...hat.com,
	linux-kernel@...r.kernel.org, horms@...nel.org,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next V4 5/5] net: lan743x: Add support to ethtool
 phylink get and set settings

> @@ -3055,6 +3071,10 @@ static void lan743x_phylink_mac_link_up(struct phylink_config *config,
>  					  cap & FLOW_CTRL_TX,
>  					  cap & FLOW_CTRL_RX);
>  
> +	if (phydev)
> +		lan743x_mac_eee_enable(adapter, phydev->enable_tx_lpi &&
> +				       phydev->eee_enabled);

This is wrong. The documentation says:

/**
 * phy_support_eee - Set initial EEE policy configuration
 * @phydev: Target phy_device struct
 *
 * This function configures the initial policy for Energy Efficient Ethernet
 * (EEE) on the specified PHY device, influencing that EEE capabilities are
 * advertised before the link is established. It should be called during PHY
 * registration by the MAC driver and/or the PHY driver (for SmartEEE PHYs)
 * if MAC supports LPI or PHY is capable to compensate missing LPI functionality
 * of the MAC.
 *
 * The function sets default EEE policy parameters, including preparing the PHY
 * to advertise EEE capabilities based on hardware support.
 *
 * It also sets the expected configuration for Low Power Idle (LPI) in the MAC
 * driver. If the PHY framework determines that both local and remote
 * advertisements support EEE, and the negotiated link mode is compatible with
 * EEE, it will set enable_tx_lpi = true. The MAC driver is expected to act on
 * this setting by enabling the LPI timer if enable_tx_lpi is set.
 */

So you should only be looking at enable_tx_lpi.

Also, do you actually call phy_support_eee() anywhere? I don't see it
in this patch, but maybe it was already there?

   	Adrew