[PATCH] [NETDEV] [003] dmfe : fix link detection

[Levitsky Maxim]

From: Maxim Levitsky <maximlevitsky@xxxxxxxxx>
Subject: [PATCH] [NET] [003] dmfe : fix link detection

Cleanup link detection
Fix link not detected when using external PHY

Signed-off-by: Maxim Levitsky <maximlevitsky@xxxxxxxxx>

---

CR12's bits 0 and 1 show link status/speed only for internal PHY.
In case external one is used, only bit 6 shows link status via special line , and can be left
unnconected
Thus we need to check bit 6 and also query PHY for link status
Note: internal phy is standard phy , so will indicate link status too.

--- linux-2.6.20-mod/drivers/net/tulip/dmfe.c   2007-02-07 18:40:33.000000000 +0200
+++ linux-2.6.20-test/drivers/net/tulip/dmfe.c  2007-02-07 18:44:01.000000000 +0200
@@ -147,7 +147,7 @@
        printk(KERN_ERR DRV_NAME ": %s %lx\n", (msg), (long) (value))
 
 #define SHOW_MEDIA_TYPE(mode) \
-       printk(KERN_ERR DRV_NAME ": \
+       printk(KERN_INFO DRV_NAME ": \
        Change Speed to %sMhz %s duplex\n",mode & 1 ?"100":"10", \
        mode & 4 ? "full":"half");
 
@@ -242,7 +242,6 @@ struct dmfe_board_info {
        u8 media_mode;                  /* user specify media mode */
        u8 op_mode;                     /* real work media mode */
        u8 phy_addr;
-       u8 link_failed;                 /* Ever link failed */
        u8 wait_reset;                  /* Hardware failed, need to reset */
        u8 dm910x_chk_mode;             /* Operating mode check */
        u8 first_in_callback;           /* Flag to record state */
@@ -536,7 +535,6 @@ static int dmfe_open(struct DEVICE *dev)
        db->tx_packet_cnt = 0;
        db->tx_queue_cnt = 0;
        db->rx_avail_cnt = 0;
-       db->link_failed = 1;
        db->wait_reset = 0;
 
        db->first_in_callback = 0;
@@ -1091,6 +1089,8 @@ static void dmfe_timer(unsigned long dat
        struct dmfe_board_info *db = netdev_priv(dev);
        unsigned long flags;
 
+       int link_ok, link_ok_phy;
+
        DMFE_DBUG(0, "dmfe_timer()", 0);
        spin_lock_irqsave(&db->lock, flags);
 
@@ -1155,22 +1155,45 @@ static void dmfe_timer(unsigned long dat
        else
                tmp_cr12 = inb(db->ioaddr + DCR12);     /* DM9102/DM9102A */
 
+       
        if ( ((db->chip_id == PCI_DM9102_ID) &&
                (db->chip_revision == 0x02000030)) ||
                ((db->chip_id == PCI_DM9132_ID) &&
                (db->chip_revision == 0x02000010)) ) {
                /* DM9102A Chip */
                if (tmp_cr12 & 2)
-                       tmp_cr12 = 0x0;         /* Link failed */
+                       link_ok = 0;
                else
-                       tmp_cr12 = 0x3; /* Link OK */
+                       link_ok = 1;
+       }
+       else
+               /*0x43 is used instead of 0x3 because bit 6 should be 
+                       connected to external PHY and specify its link status.*/
+               link_ok = (tmp_cr12 & 0x43) ? 1 : 0;
+       
+       
+       /* If chip reports that link is failed it could be because external 
+               PHY is not conected correctly to chip (through pin 89).
+               To be sure ask PHY too.
+       */
+       
+       /* need a dummy read because of PHY's register latch*/
+       phy_read (db->ioaddr, db->phy_addr, 1, db->chip_id); 
+       link_ok_phy = (phy_read (db->ioaddr, 
+                      db->phy_addr, 1, db->chip_id) & 0x4) ? 1 : 0;
+       
+
+       
+       if (link_ok_phy != link_ok) {
+               DMFE_DBUG (0, "PHY and chip report different link status", 0);
+               link_ok = link_ok | link_ok_phy;
        }
 
-       if ( !(tmp_cr12 & 0x3) && !db->link_failed ) {
+       if ( !link_ok && netif_carrier_ok(dev) ) {
                /* Link Failed */
                DMFE_DBUG(0, "Link Failed", tmp_cr12);
-               db->link_failed = 1;
-               netif_carrier_off(db->dev);
+               
+               netif_carrier_off(dev);
 
                /* For Force 10/100M Half/Full mode: Enable Auto-Nego mode */
                /* AUTO or force 1M Homerun/Longrun don't need */
@@ -1184,19 +1207,17 @@ static void dmfe_timer(unsigned long dat
                        db->cr6_data&=~0x00000200;      /* bit9=0, HD mode */
                        update_cr6(db->cr6_data, db->ioaddr);
                }
-       } else
-               if ((tmp_cr12 & 0x3) && db->link_failed) {
-                       DMFE_DBUG(0, "Link link OK", tmp_cr12);
-                       db->link_failed = 0;
+               
+       } else if (!netif_carrier_ok(dev)) {
+               
+               DMFE_DBUG(0, "Link OK", tmp_cr12);
 
                        /* Auto Sense Speed */
-                       if ( (db->media_mode & DMFE_AUTO) &&
-                               dmfe_sense_speed(db) )
-                               db->link_failed = 1;
-                       else
-                               netif_carrier_on(db->dev);
+               if (! (db->media_mode & DMFE_AUTO) || !dmfe_sense_speed(db)) {
+                       netif_carrier_on(dev);
+                       SHOW_MEDIA_TYPE(db->op_mode);
+               }
                        dmfe_process_mode(db);
-                       /* SHOW_MEDIA_TYPE(db->op_mode); */
                }
 
        /* HPNA remote command check */
@@ -1243,7 +1264,7 @@ static void dmfe_dynamic_reset(struct DE
        db->tx_packet_cnt = 0;
        db->tx_queue_cnt = 0;
        db->rx_avail_cnt = 0;
-       db->link_failed = 1;
+       netif_carrier_off(dev);
        db->wait_reset = 0;
 
        /* Re-initilize DM910X board */


 
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