fec: use interrupt for MDIO completion indication

With the move to phylib (commit e6b043d) I was seeing sporadic "MDIO write
timeout" messages. Measure of the actual time spent showed latency times of
more than 1600us.

This patch uses the MII event indication of the FEC hardware to detect
completion of MDIO transactions.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 30 deletions

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index b4afd7a6ee29..937f1b4a3483 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -187,6 +187,7 @@ struct fec_enet_private {
         int     index;
         int     link;
         int     full_duplex;
+        struct  completion mdio_done;
 };
 
 static irqreturn_t fec_enet_interrupt(int irq, void * dev_id);
@@ -205,7 +206,7 @@ static void fec_stop(struct net_device *dev);
 #define FEC_MMFR_TA             (2 << 16)
 #define FEC_MMFR_DATA(v)        (v & 0xffff)
 
-#define FEC_MII_TIMEOUT         10000
+#define FEC_MII_TIMEOUT         1000 /* us */
 
 /* Transmitter timeout */
 #define TX_TIMEOUT (2 * HZ)
@@ -334,6 +335,11 @@ fec_enet_interrupt(int irq, void * dev_id)
                         ret = IRQ_HANDLED;
                         fec_enet_tx(dev);
                 }
+
+                if (int_events & FEC_ENET_MII) {
+                        ret = IRQ_HANDLED;
+                        complete(&fep->mdio_done);
+                }
         } while (int_events);
 
         return ret;
@@ -608,18 +614,13 @@ spin_unlock:
                 phy_print_status(phy_dev);
 }
 
-/*
- * NOTE: a MII transaction is during around 25 us, so polling it...
- */
 static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 {
         struct fec_enet_private *fep = bus->priv;
-        int timeout = FEC_MII_TIMEOUT;
+        unsigned long time_left;
 
         fep->mii_timeout = 0;
-
-        /* clear MII end of transfer bit*/
-        writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
+        init_completion(&fep->mdio_done);
 
         /* start a read op */
         writel(FEC_MMFR_ST | FEC_MMFR_OP_READ |
@@ -627,13 +628,12 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
                 FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
 
         /* wait for end of transfer */
-        while (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_MII)) {
-                cpu_relax();
-                if (timeout-- < 0) {
-                        fep->mii_timeout = 1;
-                        printk(KERN_ERR "FEC: MDIO read timeout\n");
-                        return -ETIMEDOUT;
-                }
+        time_left = wait_for_completion_timeout(&fep->mdio_done,
+                        usecs_to_jiffies(FEC_MII_TIMEOUT));
+        if (time_left == 0) {
+                fep->mii_timeout = 1;
+                printk(KERN_ERR "FEC: MDIO read timeout\n");
+                return -ETIMEDOUT;
         }
 
         /* return value */
@@ -644,12 +644,10 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
                            u16 value)
 {
         struct fec_enet_private *fep = bus->priv;
-        int timeout = FEC_MII_TIMEOUT;
+        unsigned long time_left;
 
         fep->mii_timeout = 0;
-
-        /* clear MII end of transfer bit*/
-        writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
+        init_completion(&fep->mdio_done);
 
         /* start a read op */
         writel(FEC_MMFR_ST | FEC_MMFR_OP_READ |
@@ -658,13 +656,12 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
                 fep->hwp + FEC_MII_DATA);
 
         /* wait for end of transfer */
-        while (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_MII)) {
-                cpu_relax();
-                if (timeout-- < 0) {
-                        fep->mii_timeout = 1;
-                        printk(KERN_ERR "FEC: MDIO write timeout\n");
-                        return -ETIMEDOUT;
-                }
+        time_left = wait_for_completion_timeout(&fep->mdio_done,
+                        usecs_to_jiffies(FEC_MII_TIMEOUT));
+        if (time_left == 0) {
+                fep->mii_timeout = 1;
+                printk(KERN_ERR "FEC: MDIO write timeout\n");
+                return -ETIMEDOUT;
         }
 
         return 0;
@@ -1216,7 +1213,8 @@ fec_restart(struct net_device *dev, int duplex)
         writel(0, fep->hwp + FEC_R_DES_ACTIVE);
 
         /* Enable interrupts we wish to service */
-        writel(FEC_ENET_TXF | FEC_ENET_RXF, fep->hwp + FEC_IMASK);
+        writel(FEC_ENET_TXF | FEC_ENET_RXF | FEC_ENET_MII,
+                        fep->hwp + FEC_IMASK);
 }
 
 static void
@@ -1236,9 +1234,6 @@ fec_stop(struct net_device *dev)
         writel(1, fep->hwp + FEC_ECNTRL);
         udelay(10);
 
-        /* Clear outstanding MII command interrupts. */
-        writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
-
         writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
 }