Commit 65d7be09 authored by Alexandru Ardelean's avatar Alexandru Ardelean Committed by David S. Miller
Browse files

net: phy: adin: implement Energy Detect Powerdown mode via phy-tunable 



This driver becomes the first user of the kernel's `ETHTOOL_PHY_EDPD`
phy-tunable feature.
EDPD is also enabled by default on PHY config_init, but can be disabled via
the phy-tunable control.

When enabling EDPD, it's also a good idea (for the ADIN PHYs) to enable TX
periodic pulses, so that in case the other PHY is also on EDPD mode, there
is no lock-up situation where both sides are waiting for the other to
transmit.

Via the phy-tunable control, TX pulses can be disabled if specifying 0
`tx-interval` via ethtool.

The ADIN PHY supports only fixed 1 second intervals; they cannot be
configured. That is why the acceptable values are 1,
ETHTOOL_PHY_EDPD_DFLT_TX_MSECS and ETHTOOL_PHY_EDPD_NO_TX (which disables
TX pulses).

Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarAlexandru Ardelean <alexandru.ardelean@analog.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9f2f13f4

drivers/net/phy/adin.c

+61 −0
Original line number Diff line number Diff line
@@ -26,6 +26,11 @@ 


#define ADIN1300_RX_ERR_CNT			0x0014



#define ADIN1300_PHY_CTRL_STATUS2		0x0015

#define   ADIN1300_NRG_PD_EN			BIT(3)

#define   ADIN1300_NRG_PD_TX_EN			BIT(2)

#define   ADIN1300_NRG_PD_STATUS		BIT(1)



#define ADIN1300_PHY_CTRL2			0x0016

#define   ADIN1300_DOWNSPEED_AN_100_EN		BIT(11)

#define   ADIN1300_DOWNSPEED_AN_10_EN		BIT(10)
@@ -328,12 +333,62 @@ static int adin_set_downshift(struct phy_device *phydev, u8 cnt) 
			    ADIN1300_DOWNSPEEDS_EN);

}



static int adin_get_edpd(struct phy_device *phydev, u16 *tx_interval)

{

	int val;



	val = phy_read(phydev, ADIN1300_PHY_CTRL_STATUS2);

	if (val < 0)

		return val;



	if (ADIN1300_NRG_PD_EN & val) {

		if (val & ADIN1300_NRG_PD_TX_EN)

			/* default is 1 second */

			*tx_interval = ETHTOOL_PHY_EDPD_DFLT_TX_MSECS;

		else

			*tx_interval = ETHTOOL_PHY_EDPD_NO_TX;

	} else {

		*tx_interval = ETHTOOL_PHY_EDPD_DISABLE;

	}



	return 0;

}



static int adin_set_edpd(struct phy_device *phydev, u16 tx_interval)

{

	u16 val;



	if (tx_interval == ETHTOOL_PHY_EDPD_DISABLE)

		return phy_clear_bits(phydev, ADIN1300_PHY_CTRL_STATUS2,

				(ADIN1300_NRG_PD_EN | ADIN1300_NRG_PD_TX_EN));



	val = ADIN1300_NRG_PD_EN;



	switch (tx_interval) {

	case 1000: /* 1 second */

		/* fallthrough */

	case ETHTOOL_PHY_EDPD_DFLT_TX_MSECS:

		val |= ADIN1300_NRG_PD_TX_EN;

		/* fallthrough */

	case ETHTOOL_PHY_EDPD_NO_TX:

		break;

	default:

		return -EINVAL;

	}



	return phy_modify(phydev, ADIN1300_PHY_CTRL_STATUS2,

			  (ADIN1300_NRG_PD_EN | ADIN1300_NRG_PD_TX_EN),

			  val);

}



static int adin_get_tunable(struct phy_device *phydev,

			    struct ethtool_tunable *tuna, void *data)

{

	switch (tuna->id) {

	case ETHTOOL_PHY_DOWNSHIFT:

		return adin_get_downshift(phydev, data);

	case ETHTOOL_PHY_EDPD:

		return adin_get_edpd(phydev, data);

	default:

		return -EOPNOTSUPP;

	}
@@ -345,6 +400,8 @@ static int adin_set_tunable(struct phy_device *phydev, 
	switch (tuna->id) {

	case ETHTOOL_PHY_DOWNSHIFT:

		return adin_set_downshift(phydev, *(const u8 *)data);

	case ETHTOOL_PHY_EDPD:

		return adin_set_edpd(phydev, *(const u16 *)data);

	default:

		return -EOPNOTSUPP;

	}
@@ -368,6 +425,10 @@ static int adin_config_init(struct phy_device *phydev) 
	if (rc < 0)

		return rc;



	rc = adin_set_edpd(phydev, ETHTOOL_PHY_EDPD_DFLT_TX_MSECS);

	if (rc < 0)

		return rc;



	phydev_dbg(phydev, "PHY is using mode '%s'\n",

		   phy_modes(phydev->interface));

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