FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2025-01-10 03:20:49 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

net: phy: add phy_speed_down and phy_speed_up

Browse Source 
Some network drivers include functionality to speed down the PHY when
suspending and just waiting for a WoL packet because this saves energy.
This functionality is quite generic, therefore let's factor it out to
phylib.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2018-07-12 21:32:53 +02:00 committed by David S. Miller
parent 7629958070
commit 2b9672ddb6
2 changed files with 80 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
drivers/net/phy/phy.c
View File

@ -551,6 +551,84 @@ int phy_start_aneg(struct phy_device *phydev)
}
EXPORT_SYMBOL(phy_start_aneg);
static int phy_poll_aneg_done(struct phy_device *phydev)
{
unsigned int retries = 100;
int ret;
do {
msleep(100);
ret = phy_aneg_done(phydev);
} while (!ret && --retries);
if (!ret)
return -ETIMEDOUT;
return ret < 0 ? ret : 0;
}
/**
* phy_speed_down - set speed to lowest speed supported by both link partners
* @phydev: the phy_device struct
* @sync: perform action synchronously
*
* Description: Typically used to save energy when waiting for a WoL packet
*
* WARNING: Setting sync to false may cause the system being unable to suspend
* in case the PHY generates an interrupt when finishing the autonegotiation.
* This interrupt may wake up the system immediately after suspend.
* Therefore use sync = false only if you're sure it's safe with the respective
* network chip.
*/
int phy_speed_down(struct phy_device *phydev, bool sync)
{
u32 adv = phydev->lp_advertising & phydev->supported;
u32 adv_old = phydev->advertising;
int ret;
if (phydev->autoneg != AUTONEG_ENABLE)
return 0;
if (adv & PHY_10BT_FEATURES)
phydev->advertising &= ~(PHY_100BT_FEATURES |
PHY_1000BT_FEATURES);
else if (adv & PHY_100BT_FEATURES)
phydev->advertising &= ~PHY_1000BT_FEATURES;
if (phydev->advertising == adv_old)
return 0;
ret = phy_config_aneg(phydev);
if (ret)
return ret;
return sync ? phy_poll_aneg_done(phydev) : 0;
}
EXPORT_SYMBOL_GPL(phy_speed_down);
/**
* phy_speed_up - (re)set advertised speeds to all supported speeds
* @phydev: the phy_device struct
*
* Description: Used to revert the effect of phy_speed_down
*/
int phy_speed_up(struct phy_device *phydev)
{
u32 mask = PHY_10BT_FEATURES | PHY_100BT_FEATURES | PHY_1000BT_FEATURES;
u32 adv_old = phydev->advertising;
if (phydev->autoneg != AUTONEG_ENABLE)
return 0;
phydev->advertising = (adv_old & ~mask) | (phydev->supported & mask);
if (phydev->advertising == adv_old)
return 0;
return phy_config_aneg(phydev);
}
EXPORT_SYMBOL_GPL(phy_speed_up);
/**
* phy_start_machine - start PHY state machine tracking
* @phydev: the phy_device struct

2
include/linux/phy.h
View File

@ -942,6 +942,8 @@ void phy_start(struct phy_device *phydev);
void phy_stop(struct phy_device *phydev);
int phy_start_aneg(struct phy_device *phydev);
int phy_aneg_done(struct phy_device *phydev);
int phy_speed_down(struct phy_device *phydev, bool sync);
int phy_speed_up(struct phy_device *phydev);
int phy_stop_interrupts(struct phy_device *phydev);
int phy_restart_aneg(struct phy_device *phydev);