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net: phy: add configuration of rx clock stop mode

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Add a function to allow configuration of the PCS's clock stop enable
bit, used to configure whether the xMII receive clock can be stopped
during LPI mode.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1tVZDR-0002Jl-Ry@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2025-01-08 16:47:33 +00:00 committed by Jakub Kicinski
parent 7b24f164cf
commit cf337105ad
2 changed files with 23 additions and 5 deletions
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27
drivers/net/phy/phy.c
View File

@ -1640,6 +1640,27 @@ void phy_mac_interrupt(struct phy_device *phydev)
}
EXPORT_SYMBOL(phy_mac_interrupt);
/**
* phy_eee_rx_clock_stop() - configure PHY receive clock in LPI
* @phydev: target phy_device struct
* @clk_stop_enable: flag to indicate whether the clock can be stopped
*
* Configure whether the PHY can disable its receive clock during LPI mode,
* See IEEE 802.3 sections 22.2.2.2, 35.2.2.10, and 45.2.3.1.4.
*
* Returns: 0 or negative error.
*/
int phy_eee_rx_clock_stop(struct phy_device *phydev, bool clk_stop_enable)
{
/* Configure the PHY to stop receiving xMII
* clock while it is signaling LPI.
*/
return phy_modify_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
MDIO_PCS_CTRL1_CLKSTOP_EN,
clk_stop_enable ? MDIO_PCS_CTRL1_CLKSTOP_EN : 0);
}
EXPORT_SYMBOL_GPL(phy_eee_rx_clock_stop);
/**
* phy_init_eee - init and check the EEE feature
* @phydev: target phy_device struct
@ -1664,11 +1685,7 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
return -EPROTONOSUPPORT;
if (clk_stop_enable)
/* Configure the PHY to stop receiving xMII
* clock while it is signaling LPI.
*/
ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
MDIO_PCS_CTRL1_CLKSTOP_EN);
ret = phy_eee_rx_clock_stop(phydev, true);
return ret < 0 ? ret : 0;
}

1
include/linux/phy.h
View File

@ -2096,6 +2096,7 @@ int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask);
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_eee_rx_clock_stop(struct phy_device *phydev, bool clk_stop_enable);
int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable);
int phy_get_eee_err(struct phy_device *phydev);
int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_keee *data);