netdev - [net-next 6/6] e1000e: disable force K1-off feature

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Message-Id: <20190723173650.23276-7-jeffrey.t.kirsher@intel.com>
Date:   Tue, 23 Jul 2019 10:36:50 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        Aaron Brown <aaron.f.brown@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 6/6] e1000e: disable force K1-off feature

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

MAC-PHY desync may occur causing miss detection of link up event.
Disabling K1-off feature can work around the problem.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204057

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/e1000e/hw.h      | 1 +
 drivers/net/ethernet/intel/e1000e/ich8lan.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/hw.h b/drivers/net/ethernet/intel/e1000e/hw.h
index eff75bd8a8f0..e3c71fd093ee 100644
--- a/drivers/net/ethernet/intel/e1000e/hw.h
+++ b/drivers/net/ethernet/intel/e1000e/hw.h
@@ -662,6 +662,7 @@ struct e1000_dev_spec_ich8lan {
 	bool kmrn_lock_loss_workaround_enabled;
 	struct e1000_shadow_ram shadow_ram[E1000_ICH8_SHADOW_RAM_WORDS];
 	bool nvm_k1_enabled;
+	bool disable_k1_off;
 	bool eee_disable;
 	u16 eee_lp_ability;
 	enum e1000_ulp_state ulp_state;
diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index a1fab77b2096..6a9a4014f4b7 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -1538,6 +1538,9 @@ static s32 e1000_check_for_copper_link_ich8lan(struct e1000_hw *hw)
 				fextnvm6 &= ~E1000_FEXTNVM6_K1_OFF_ENABLE;
 		}
 
+		if (hw->dev_spec.ich8lan.disable_k1_off == true)
+			fextnvm6 &= ~E1000_FEXTNVM6_K1_OFF_ENABLE;
+
 		ew32(FEXTNVM6, fextnvm6);
 	}
 
-- 
2.21.0