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smsc75xx: fix mdio reads and writes 

smsc75xx needs MII_ACCESS_BUSY to be set to correctly trigger mdio I/O.  Note smsc75xx is different from smsc95xx in this regard.

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>
This commit is contained in:
Steve Glendinning 2012-04-30 07:56:51 +00:00 committed by David S. Miller
parent 7bdd305e02
commit cb8722d30c
1 changed files with 2 additions and 2 deletions
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4
drivers/net/usb/smsc75xx.c
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@ -171,7 +171,7 @@ static int smsc75xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
idx &= dev->mii.reg_num_mask;
addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
| ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
| MII_ACCESS_READ;
| MII_ACCESS_READ | MII_ACCESS_BUSY;
ret = smsc75xx_write_reg(dev, MII_ACCESS, addr);
check_warn_goto_done(ret, "Error writing MII_ACCESS");
@ -210,7 +210,7 @@ static void smsc75xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
idx &= dev->mii.reg_num_mask;
addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
| ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
| MII_ACCESS_WRITE;
| MII_ACCESS_WRITE | MII_ACCESS_BUSY;
ret = smsc75xx_write_reg(dev, MII_ACCESS, addr);
check_warn_goto_done(ret, "Error writing MII_ACCESS");