ixgbe: Fix 82598 premature copper PHY link indicatation

Modified patch with Dave's comments to replace mdelay with proper msleep.
Fix 82598 copper link issue, where the phy prematurely indicates link
before it is ready to process packets. The new function looks for phy
link and indicates that, when it is available. If phy is not ready
within few seconds of MAC indicating link, the function will return
failure which translates to link down indication.

Signed-off-by:  Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ixgbe/ixgbe_82598.c b/drivers/net/ixgbe/ixgbe_82598.c
index e2d5343f127553d7ad7c5d4b032bd087f66db990..204177d78cecfc1479ae867d0e40709ec2297ec1 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_82598.c
+++ b/drivers/net/ixgbe/ixgbe_82598.c
@@ -509,6 +509,40 @@ static s32 ixgbe_start_mac_link_82598(struct ixgbe_hw *hw,
        return status;
 }
 
+/**
+ *  ixgbe_validate_link_ready - Function looks for phy link
+ *  @hw: pointer to hardware structure
+ *
+ *  Function indicates success when phy link is available. If phy is not ready
+ *  within 5 seconds of MAC indicating link, the function returns error.
+ **/
+static s32 ixgbe_validate_link_ready(struct ixgbe_hw *hw)
+{
+       u32 timeout;
+       u16 an_reg;
+
+       if (hw->device_id != IXGBE_DEV_ID_82598AT2)
+               return 0;
+
+       for (timeout = 0;
+            timeout < IXGBE_VALIDATE_LINK_READY_TIMEOUT; timeout++) {
+               hw->phy.ops.read_reg(hw, MDIO_STAT1, MDIO_MMD_AN, &an_reg);
+
+               if ((an_reg & MDIO_AN_STAT1_COMPLETE) &&
+                   (an_reg & MDIO_STAT1_LSTATUS))
+                       break;
+
+               msleep(100);
+       }
+
+       if (timeout == IXGBE_VALIDATE_LINK_READY_TIMEOUT) {
+               hw_dbg(hw, "Link was indicated but link is down\n");
+               return IXGBE_ERR_LINK_SETUP;
+       }
+
+       return 0;
+}
+
 /**
  *  ixgbe_check_mac_link_82598 - Get link/speed status
  *  @hw: pointer to hardware structure
@@ -589,6 +623,10 @@ static s32 ixgbe_check_mac_link_82598(struct ixgbe_hw *hw,
        else
                *speed = IXGBE_LINK_SPEED_1GB_FULL;
 
+       if ((hw->device_id == IXGBE_DEV_ID_82598AT2) && (*link_up == true) &&
+           (ixgbe_validate_link_ready(hw) != 0))
+               *link_up = false;
+
        /* if link is down, zero out the current_mode */
        if (*link_up == false) {
                hw->fc.current_mode = ixgbe_fc_none;

diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index f3e8d52610b7d57960dbbe835cdb7845ed05dc2f..84650c6ebe038bcfbebf872b1c56c4804ec50680 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -841,6 +841,8 @@
 #define IXGBE_MPVC      0x04318
 #define IXGBE_SGMIIC    0x04314
 
+#define IXGBE_VALIDATE_LINK_READY_TIMEOUT 50
+
 /* Omer CORECTL */
 #define IXGBE_CORECTL           0x014F00
 /* BARCTRL */