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Commit 2a6deb6a authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'phy-helpers' 



Heiner Kallweit says:

====================
net: phy: add functionality to speed down PHY when waiting for WoL packet

Some network drivers include functionality to speed down the PHY when
suspending and just waiting for a WoL packet because this saves energy.

This patch is based on our recent discussion about factoring out this
functionality to phylib. First user will be the r8169 driver.

v2:
- add warning comment to phy_speed_down regarding usage of sync = false
- remove sync parameter from phy_speed_up
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 7f657d5b 2b9672dd

drivers/net/phy/phy.c

+87 −4
Original line number Diff line number Diff line
@@ -467,6 +467,14 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd) 
}

EXPORT_SYMBOL(phy_mii_ioctl);



static int phy_config_aneg(struct phy_device *phydev)

{

	if (phydev->drv->config_aneg)

		return phydev->drv->config_aneg(phydev);

	else

		return genphy_config_aneg(phydev);

}



/**

 * phy_start_aneg_priv - start auto-negotiation for this PHY device

 * @phydev: the phy_device struct
@@ -493,10 +501,7 @@ static int phy_start_aneg_priv(struct phy_device *phydev, bool sync) 
	/* Invalidate LP advertising flags */

	phydev->lp_advertising = 0;



	if (phydev->drv->config_aneg)

		err = phydev->drv->config_aneg(phydev);

	else

		err = genphy_config_aneg(phydev);

	err = phy_config_aneg(phydev);

	if (err < 0)

		goto out_unlock;
@@ -546,6 +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

include/linux/phy.h

+2 −0
Original line number Diff line number Diff line
@@ -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);