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net: phy: add phy_speed_down_core and phy_resolve_min_speed

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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: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Heiner Kallweit 2019-08-12 23:51:27 +02:00 committed by Jakub Kicinski
parent 7b261e0ef5
commit 331c56ac73
2 changed files with 29 additions and 0 deletions
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28
drivers/net/phy/phy-core.c
View File

@ -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)
{

1
include/linux/phy.h
View File

@ -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