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

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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: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mike Looijmans 2016-10-04 07:52:04 +02:00 committed by David S. Miller
parent a44c984f1e
commit af70c1f92d
1 changed files with 21 additions and 0 deletions
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21
drivers/net/phy/micrel.c
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@ -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