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Date: Mon, 20 Mar 2017 18:51:19 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Chris J Arges <christopherarges@...il.com>, Aaron Brown <aaron.f.brown@...el.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com>, Sasha Levin <alexander.levin@...izon.com> Subject: [PATCH 4.9 44/93] igb: Workaround for igb i210 firmware issue 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chris J Arges <christopherarges@...il.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 <christopherarges@...il.com> Tested-by: Aaron Brown <aaron.f.brown@...el.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
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