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Commit af70c1f9 authored by Mike Looijmans's avatar Mike Looijmans Committed by David S. Miller
Browse files

phy: micrel.c: Enable ksz9031 energy-detect power-down mode 



Set bit 0 in register 1C.23 to enable the EDPD feature of the
KSZ9031 PHY. This reduces power consumption when the link is
down.

Signed-off-by: default avatarMike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a44c984f

drivers/net/phy/micrel.c

+21 −0
Original line number Diff line number Diff line
@@ -439,6 +439,10 @@ static int ksz9021_config_init(struct phy_device *phydev) 
#define MII_KSZ9031RN_TX_DATA_PAD_SKEW	6

#define MII_KSZ9031RN_CLK_PAD_SKEW	8



/* MMD Address 0x1C */

#define MII_KSZ9031RN_EDPD		0x23

#define MII_KSZ9031RN_EDPD_ENABLE	BIT(0)



static int ksz9031_extended_write(struct phy_device *phydev,

				  u8 mode, u32 dev_addr, u32 regnum, u16 val)

{
@@ -510,6 +514,18 @@ static int ksz9031_center_flp_timing(struct phy_device *phydev) 
	return genphy_restart_aneg(phydev);

}



/* Enable energy-detect power-down mode */

static int ksz9031_enable_edpd(struct phy_device *phydev)

{

	int reg;



	reg = ksz9031_extended_read(phydev, OP_DATA, 0x1C, MII_KSZ9031RN_EDPD);

	if (reg < 0)

		return reg;

	return ksz9031_extended_write(phydev, OP_DATA, 0x1C, MII_KSZ9031RN_EDPD,

				      reg | MII_KSZ9031RN_EDPD_ENABLE);

}



static int ksz9031_config_init(struct phy_device *phydev)

{

	const struct device *dev = &phydev->mdio.dev;
@@ -525,6 +541,11 @@ static int ksz9031_config_init(struct phy_device *phydev) 
	};

	static const char *control_skews[2] = {"txen-skew-ps", "rxdv-skew-ps"};

	const struct device *dev_walker;

	int result;



	result = ksz9031_enable_edpd(phydev);

	if (result < 0)

		return result;



	/* The Micrel driver has a deprecated option to place phy OF

	 * properties in the MAC node. Walk up the tree of devices to