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authorMike Looijmans <mike.looijmans@topic.nl>2016-10-04 07:52:04 +0200
committerDavid S. Miller <davem@davemloft.net>2016-10-05 21:19:06 -0400
commitaf70c1f92d3567035d2f73f39079459d58c706dc (patch)
tree3c1e3afa5a3ce61dadb675f0e253e1b2ff6bd6bc /drivers/net/phy
parenta44c984f1ef16229cdfd92326ad10118b1940ff9 (diff)
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: 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>
Diffstat (limited to 'drivers/net/phy')
-rw-r--r--drivers/net/phy/micrel.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 885ac9cbab5a..081df68d2ce1 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -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