igb: Workaround for igb i210 firmware issue

commit 4e684f59d760a2c7c716bb60190783546e2d08a1 upstream.

Sometimes firmware may not properly initialize I347AT4_PAGE_SELECT causing
the probe of an igb i210 NIC to fail. This patch adds an addition zeroing
of this register during igb_get_phy_id to workaround this issue.

Thanks for Jochen Henneberg for the idea and original patch.

Signed-off-by: Chris J Arges <christopherarges@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/net/ethernet/intel/igb/e1000_phy.c b/drivers/net/ethernet/intel/igb/e1000_phy.c
index 5dec66a96793a74fa1a75c6811524d37c7b933aa..3012c09c5c1c52aeef31904a2accfc6f34d62292 100644 (file)
--- a/drivers/net/ethernet/intel/igb/e1000_phy.c
+++ b/drivers/net/ethernet/intel/igb/e1000_phy.c
@@ -87,6 +87,10 @@ s32 igb_get_phy_id(struct e1000_hw *hw)
        s32 ret_val = 0;
        u16 phy_id;
 
+       /* ensure PHY page selection to fix misconfigured i210 */
+       if (hw->mac.type == e1000_i210)
+               phy->ops.write_reg(hw, I347AT4_PAGE_SELECT, 0);
+
        ret_val = phy->ops.read_reg(hw, PHY_ID1, &phy_id);
        if (ret_val)
                goto out;