tc35815: Increase timeout for mdio

The current timeout value is too short for very high-load condition
which jiffies might jump up in busy-loop.
Also add minimum delay before checking completion of MDIO.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c
index 62965d6665d2..f42aaf72cc95 100644
--- a/drivers/net/tc35815.c
+++ b/drivers/net/tc35815.c
@@ -594,9 +594,10 @@ static int tc_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
         struct net_device *dev = bus->priv;
         struct tc35815_regs __iomem *tr =
                 (struct tc35815_regs __iomem *)dev->base_addr;
-        unsigned long timeout = jiffies + 10;
+        unsigned long timeout = jiffies + HZ;
 
         tc_writel(MD_CA_Busy | (mii_id << 5) | (regnum & 0x1f), &tr->MD_CA);
+        udelay(12); /* it takes 32 x 400ns at least */
         while (tc_readl(&tr->MD_CA) & MD_CA_Busy) {
                 if (time_after(jiffies, timeout))
                         return -EIO;
@@ -610,11 +611,12 @@ static int tc_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 val)
         struct net_device *dev = bus->priv;
         struct tc35815_regs __iomem *tr =
                 (struct tc35815_regs __iomem *)dev->base_addr;
-        unsigned long timeout = jiffies + 10;
+        unsigned long timeout = jiffies + HZ;
 
         tc_writel(val, &tr->MD_Data);
         tc_writel(MD_CA_Busy | MD_CA_Wr | (mii_id << 5) | (regnum & 0x1f),
                   &tr->MD_CA);
+        udelay(12); /* it takes 32 x 400ns at least */
         while (tc_readl(&tr->MD_CA) & MD_CA_Busy) {
                 if (time_after(jiffies, timeout))
                         return -EIO;