smsc75xx: enable mac to detect speed/duplex from phy

This patch sets the automatic speed and duplex detection bits
in MAC_CR to enable the mac to determine its speed automatically
from the phy.

Note this must be done BEFORE the receiver or transmitter is
enabled.

Signed-off-by: Stephane Fillod <fillods@users.sf.net>
Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index ae23d85a973a..00103a8c5e04 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -951,6 +951,14 @@ static int smsc75xx_reset(struct usbnet *dev)
         ret = smsc75xx_write_reg(dev, INT_EP_CTL, buf);
         check_warn_return(ret, "Failed to write INT_EP_CTL: %d", ret);
 
+        /* allow mac to detect speed and duplex from phy */
+        ret = smsc75xx_read_reg(dev, MAC_CR, &buf);
+        check_warn_return(ret, "Failed to read MAC_CR: %d", ret);
+
+        buf |= (MAC_CR_ADD | MAC_CR_ASD);
+        ret = smsc75xx_write_reg(dev, MAC_CR, buf);
+        check_warn_return(ret, "Failed to write MAC_CR: %d", ret);
+
         ret = smsc75xx_read_reg(dev, MAC_TX, &buf);
         check_warn_return(ret, "Failed to read MAC_TX: %d", ret);