smsc75xx: fix phy interrupt acknowledge

smsc75xx phy interrupt acknowledge needs an mdio_write to clear
PHY_INT_SRC instead of just a read like in smsc95xx.

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, 7 insertions, 5 deletions

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index cc23a589e40f..4941782358ef 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -508,9 +508,10 @@ static int smsc75xx_link_reset(struct usbnet *dev)
         u16 lcladv, rmtadv;
         int ret;
 
-        /* clear interrupt status */
+        /* read and write to clear phy interrupt status */
         ret = smsc75xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
         check_warn_return(ret, "Error reading PHY_INT_SRC");
+        smsc75xx_mdio_write(dev->net, mii->phy_id, PHY_INT_SRC, 0xffff);
 
         ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);
         check_warn_return(ret, "Error writing INT_STS");
@@ -643,7 +644,7 @@ static int smsc75xx_set_mac_address(struct usbnet *dev)
 
 static int smsc75xx_phy_initialize(struct usbnet *dev)
 {
-        int bmcr, timeout = 0;
+        int bmcr, ret, timeout = 0;
 
         /* Initialize MII structure */
         dev->mii.dev = dev->net;
@@ -672,9 +673,10 @@ static int smsc75xx_phy_initialize(struct usbnet *dev)
                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
                 ADVERTISE_PAUSE_ASYM);
 
-        /* read to clear */
-        smsc75xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
-        check_warn_return(bmcr, "Error reading PHY_INT_SRC");
+        /* read and write to clear phy interrupt status */
+        ret = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
+        check_warn_return(ret, "Error reading PHY_INT_SRC");
+        smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_SRC, 0xffff);
 
         smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
                 PHY_INT_MASK_DEFAULT);