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igb: Workaround for igb i210 firmware issue

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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>
This commit is contained in:
Chris J Arges 2016-11-02 09:13:42 -05:00 committed by Jeff Kirsher
parent c4f9b6e578
commit 4e684f59d7
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/intel/igb/e1000_phy.c
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@ -77,6 +77,10 @@ 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;