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net: phy: Add phy_support_eee() indicating MAC support EEE 

In order for EEE to operate, both the MAC and the PHY need to support
it, similar to how pause works. With some exception - a number of PHYs
have SmartEEE or AutoGrEEEn support in order to provide some EEE-like
power savings with non-EEE capable MACs.

Copy the pause concept and add the call phy_support_eee() which the MAC
makes after connecting the PHY to indicate it supports EEE. phylib will
then advertise EEE when auto-neg is performed.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20240302195306.3207716-6-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrew Lunn 2024-03-02 20:53:04 +01:00 committed by Jakub Kicinski
parent 3e43b903da
commit 49168d1980
2 changed files with 30 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/net/phy/phy_device.c
View File

@ -2910,6 +2910,34 @@ void phy_advertise_eee_all(struct phy_device *phydev)
}
EXPORT_SYMBOL_GPL(phy_advertise_eee_all);
/**
* 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.
*/
void phy_support_eee(struct phy_device *phydev)
{
linkmode_copy(phydev->advertising_eee, phydev->supported_eee);
phydev->eee_cfg.tx_lpi_enabled = true;
phydev->eee_cfg.eee_enabled = true;
}
EXPORT_SYMBOL(phy_support_eee);
/**
* phy_support_sym_pause - Enable support of symmetrical pause
* @phydev: target phy_device struct

3
include/linux/phy.h
View File

@ -706,7 +706,7 @@ struct phy_device {
__ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising);
/* used with phy_speed_down */
__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
/* used for eee validation */
/* used for eee validation and configuration*/
__ETHTOOL_DECLARE_LINK_MODE_MASK(supported_eee);
__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising_eee);
bool eee_enabled;
@ -1973,6 +1973,7 @@ void phy_advertise_supported(struct phy_device *phydev);
void phy_advertise_eee_all(struct phy_device *phydev);
void phy_support_sym_pause(struct phy_device *phydev);
void phy_support_asym_pause(struct phy_device *phydev);
void phy_support_eee(struct phy_device *phydev);
void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx,
bool autoneg);
void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx);