Forwardport from http://mails.dpdk.org/archives/dev/2016-November/050658.html
MAC-PHY desync may occur causing misdetection 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.f...@canonical.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 56f88a4e538c..c1e0e03dc5cb 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); } -- 2.17.1
