linux-kernel - [PATCH 3.12 058/142] igb: Workaround for igb i210 firmware issue

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Message-Id: <f3102ed1f121cdb44251e1b8f0bf2ea8e3111ee5.1491838390.git.jslaby@suse.cz>
Date:   Mon, 10 Apr 2017 17:32:19 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Chris J Arges <christopherarges@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 058/142] igb: Workaround for igb i210 firmware issue

From: Chris J Arges <christopherarges@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ 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: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/ethernet/intel/igb/e1000_phy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/e1000_phy.c b/drivers/net/ethernet/intel/igb/e1000_phy.c
index ad2b74d95138..bd91752760d0 100644
--- 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;
-- 
2.12.2