Commit 331c56ac authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Jakub Kicinski
Browse files

net: phy: add phy_speed_down_core and phy_resolve_min_speed 



phy_speed_down_core provides most of the functionality for
phy_speed_down. It makes use of new helper phy_resolve_min_speed that is
based on the sorting of the settings[] array. In certain cases it may be
helpful to be able to exclude legacy half duplex modes, therefore
prepare phy_resolve_min_speed() for it.

v2:
- rename __phy_speed_down to phy_speed_down_core

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
parent 7b261e0e

drivers/net/phy/phy-core.c

+28 −0
Original line number Diff line number Diff line
@@ -315,6 +315,34 @@ void phy_resolve_aneg_linkmode(struct phy_device *phydev) 
}

EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);



static int phy_resolve_min_speed(struct phy_device *phydev, bool fdx_only)

{

	__ETHTOOL_DECLARE_LINK_MODE_MASK(common);

	int i = ARRAY_SIZE(settings);



	linkmode_and(common, phydev->lp_advertising, phydev->advertising);



	while (--i >= 0) {

		if (test_bit(settings[i].bit, common)) {

			if (fdx_only && settings[i].duplex != DUPLEX_FULL)

				continue;

			return settings[i].speed;

		}

	}



	return SPEED_UNKNOWN;

}



int phy_speed_down_core(struct phy_device *phydev)

{

	int min_common_speed = phy_resolve_min_speed(phydev, true);



	if (min_common_speed == SPEED_UNKNOWN)

		return -EINVAL;



	return __set_linkmode_max_speed(min_common_speed, phydev->advertising);

}



static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,

			     u16 regnum)

{

include/linux/phy.h

+1 −0
Original line number Diff line number Diff line
@@ -665,6 +665,7 @@ size_t phy_speeds(unsigned int *speeds, size_t size, 
		  unsigned long *mask);

void of_set_phy_supported(struct phy_device *phydev);

void of_set_phy_eee_broken(struct phy_device *phydev);

int phy_speed_down_core(struct phy_device *phydev);



/**

 * phy_is_started - Convenience function to check whether PHY is started

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