sky2: be more selective about FIFO watchdog

Be more selective about when to enable the ram buffer watchdog code.
It is unnecessary on XL A3 or later revs, and with Yukon FE
the buffer is so small (4K) that the watchdog detects false positives.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index f3a8243219ae7c69418ceb3517781f77a0529222..0792031a5cf959a1543f32f4e0f2ab4ccb7b0ec2 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -826,7 +826,8 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
        sky2_write8(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_RST_CLR);
        sky2_write16(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_OPER_ON);
 
-       if (!(hw->flags & SKY2_HW_RAMBUFFER)) {
+       /* On chips without ram buffer, pause is controled by MAC level */
+       if (sky2_read8(hw, B2_E_0) == 0) {
                sky2_write8(hw, SK_REG(port, RX_GMF_LP_THR), 768/8);
                sky2_write8(hw, SK_REG(port, RX_GMF_UP_THR), 1024/8);
 
@@ -1281,7 +1282,7 @@ static int sky2_up(struct net_device *dev)
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
-       u32 imask;
+       u32 imask, ramsize;
        int cap, err = -ENOMEM;
        struct net_device *otherdev = hw->dev[sky2->port^1];
 
@@ -1336,13 +1337,12 @@ static int sky2_up(struct net_device *dev)
 
        sky2_mac_init(hw, port);
 
-       if (hw->flags & SKY2_HW_RAMBUFFER) {
-               /* Register is number of 4K blocks on internal RAM buffer. */
-               u32 ramsize = sky2_read8(hw, B2_E_0) * 4;
+       /* Register is number of 4K blocks on internal RAM buffer. */
+       ramsize = sky2_read8(hw, B2_E_0) * 4;
+       if (ramsize > 0) {
                u32 rxspace;
 
-               printk(KERN_DEBUG PFX "%s: ram buffer %dK\n", dev->name, ramsize);
-
+               pr_debug(PFX "%s: ram buffer %dK\n", dev->name, ramsize);
                if (ramsize < 16)
                        rxspace = ramsize / 2;
                else
@@ -2005,7 +2005,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
 
        synchronize_irq(hw->pdev->irq);
 
-       if (!(hw->flags & SKY2_HW_RAMBUFFER))
+       if (sky2_read8(hw, B2_E_0) == 0)
                sky2_set_tx_stfwd(hw, port);
 
        ctl = gma_read16(hw, port, GM_GP_CTRL);
@@ -2536,7 +2536,7 @@ static void sky2_watchdog(unsigned long arg)
                        ++active;
 
                        /* For chips with Rx FIFO, check if stuck */
-                       if ((hw->flags & SKY2_HW_RAMBUFFER) &&
+                       if ((hw->flags & SKY2_HW_FIFO_HANG_CHECK) &&
                             sky2_rx_hung(dev)) {
                                pr_info(PFX "%s: receiver hang detected\n",
                                        dev->name);
@@ -2694,8 +2694,10 @@ static int __devinit sky2_init(struct sky2_hw *hw)
        switch(hw->chip_id) {
        case CHIP_ID_YUKON_XL:
                hw->flags = SKY2_HW_GIGABIT
-                       | SKY2_HW_NEWER_PHY
-                       | SKY2_HW_RAMBUFFER;
+                       | SKY2_HW_NEWER_PHY;
+               if (hw->chip_rev < 3)
+                       hw->flags |= SKY2_HW_FIFO_HANG_CHECK;
+
                break;
 
        case CHIP_ID_YUKON_EC_U:
@@ -2721,11 +2723,10 @@ static int __devinit sky2_init(struct sky2_hw *hw)
                        dev_err(&hw->pdev->dev, "unsupported revision Yukon-EC rev A1\n");
                        return -EOPNOTSUPP;
                }
-               hw->flags = SKY2_HW_GIGABIT | SKY2_HW_RAMBUFFER;
+               hw->flags = SKY2_HW_GIGABIT | SKY2_HW_FIFO_HANG_CHECK;
                break;
 
        case CHIP_ID_YUKON_FE:
-               hw->flags = SKY2_HW_RAMBUFFER;
                break;
 
        case CHIP_ID_YUKON_FE_P:

diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 69cd98400fe669639b596ea99185d66e9b49e265..8bc5c54e3efacd2cdc63e12aabd31a5ce37b0051 100644 (file)
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -2063,7 +2063,7 @@ struct sky2_hw {
 #define SKY2_HW_FIBRE_PHY      0x00000002
 #define SKY2_HW_GIGABIT                0x00000004
 #define SKY2_HW_NEWER_PHY      0x00000008
-#define SKY2_HW_RAMBUFFER      0x00000010      /* chip has RAM FIFO */
+#define SKY2_HW_FIFO_HANG_CHECK        0x00000010
 #define SKY2_HW_NEW_LE         0x00000020      /* new LSOv2 format */
 #define SKY2_HW_AUTO_TX_SUM    0x00000040      /* new IP decode for Tx */
 #define SKY2_HW_ADV_POWER_CTL  0x00000080      /* additional PHY power regs */