r8169: fix mdio_read and update mdio_write according to hw specs

[net-next-2.6.git] / drivers / net / r8169.c

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 217e709bda3ede440478bf2eb73c5646dd96e903..96b6cfbf0a3a682b14216fa23a9e737a48973aaa 100644 (file)
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -559,6 +559,11 @@ static void mdio_write(void __iomem *ioaddr, int reg_addr, int value)
                        break;
                udelay(25);
        }
+       /*
+        * According to hardware specs a 20us delay is required after write
+        * complete indication, but before sending next command.
+        */
+       udelay(20);
 }
 
 static int mdio_read(void __iomem *ioaddr, int reg_addr)
@@ -578,6 +583,12 @@ static int mdio_read(void __iomem *ioaddr, int reg_addr)
                }
                udelay(25);
        }
+       /*
+        * According to hardware specs a 20us delay is required after read
+        * complete indication, but before sending next command.
+        */
+       udelay(20);
+
        return value;
 }