4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sumit Semwal <sumit.sem...@linaro.org>
From: Chris J Arges <christopherar...@gmail.com>
[ Upstream commit 4e684f59d760a2c7c716bb60190783546e2d08a1 ]
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 <christopherar...@gmail.com>
Tested-by: Aaron Brown <aaron.f.br...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Sumit Semwal <sumit.sem...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/net/ethernet/intel/igb/e1000_phy.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/net/ethernet/intel/igb/e1000_phy.c
+++ b/drivers/net/ethernet/intel/igb/e1000_phy.c
@@ -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;
