net-next:asix:poll in asix_get_phyid in case phy not ready

Sometimes the phy isn't ready after reset...poll and pray it will be soon.

Signed-off-by: Freddy Xin <freddy@asix.com.tw>
Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/net/usb/asix.c b/drivers/net/usb/asix.c
index 873860d46e9e..b4675e89e42c 100644
--- a/drivers/net/usb/asix.c
+++ b/drivers/net/usb/asix.c
@@ -652,9 +652,17 @@ static u32 asix_get_phyid(struct usbnet *dev)
 {
         int phy_reg;
         u32 phy_id;
+        int i;
 
-        phy_reg = asix_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID1);
-        if (phy_reg < 0)
+        /* Poll for the rare case the FW or phy isn't ready yet.  */
+        for (i = 0; i < 100; i++) {
+                phy_reg = asix_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID1);
+                if (phy_reg != 0 && phy_reg != 0xFFFF)
+                        break;
+                mdelay(1);
+        }
+
+        if (phy_reg <= 0 || phy_reg == 0xFFFF)
                 return 0;
 
         phy_id = (phy_reg & 0xffff) << 16;