phy: SMSC device Energy Detect power-down mode

SMSC Ethernet Transceivers (LAN88710, LAN8710, LAN8720, LAN8187,
LAN8700, LAN83C185) provide a mechanism to conserve power when
the device is not connected to an active link partner
(Energy Detect Mode).
So this patch enables the Energy Detect power-down mode
for these Transceivers.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 5123bb954dd7..ed2644a57500 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -25,6 +25,7 @@
 
 #define MII_LAN83C185_ISF 29 /* Interrupt Source Flags */
 #define MII_LAN83C185_IM  30 /* Interrupt Mask */
+#define MII_LAN83C185_CTRL_STATUS 17 /* Mode/Status Register */
 
 #define MII_LAN83C185_ISF_INT1 (1<<1) /* Auto-Negotiation Page Received */
 #define MII_LAN83C185_ISF_INT2 (1<<2) /* Parallel Detection Fault */
@@ -37,8 +38,10 @@
 #define MII_LAN83C185_ISF_INT_ALL (0x0e)
 
 #define MII_LAN83C185_ISF_INT_PHYLIB_EVENTS \
-        (MII_LAN83C185_ISF_INT6 | MII_LAN83C185_ISF_INT4)
+        (MII_LAN83C185_ISF_INT6 | MII_LAN83C185_ISF_INT4 | \
+         MII_LAN83C185_ISF_INT7)
 
+#define MII_LAN83C185_EDPWRDOWN (1 << 13) /* EDPWRDOWN */
 
 static int smsc_phy_config_intr(struct phy_device *phydev)
 {
@@ -59,9 +62,23 @@ static int smsc_phy_ack_interrupt(struct phy_device *phydev)
 
 static int smsc_phy_config_init(struct phy_device *phydev)
 {
+        int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
+        if (rc < 0)
+                return rc;
+
+        /* Enable energy detect mode for this SMSC Transceivers */
+        rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
+                       rc | MII_LAN83C185_EDPWRDOWN);
+        if (rc < 0)
+                return rc;
+
         return smsc_phy_ack_interrupt (phydev);
 }
 
+static int lan911x_config_init(struct phy_device *phydev)
+{
+        return smsc_phy_ack_interrupt(phydev);
+}
 
 static struct phy_driver lan83c185_driver = {
         .phy_id         = 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */
@@ -147,7 +164,7 @@ static struct phy_driver lan911x_int_driver = {
         /* basic functions */
         .config_aneg    = genphy_config_aneg,
         .read_status    = genphy_read_status,
-        .config_init    = smsc_phy_config_init,
+        .config_init    = lan911x_config_init,
 
         /* IRQ related */
         .ack_interrupt  = smsc_phy_ack_interrupt,