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e1000e: disable K1 at 1000Mbps for 82577/82578

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This workaround is required for an issue in hardware where noise on the
interconnect between the MAC and PHY could be generated by a lower power
mode (K1) at 1000Mbps resulting in bad packets.  Disable K1 while at 1000
Mbps but keep it enabled for 10/100Mbps and when the cable is disconnected.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruce Allan
2009-07-01 13:29:08 +00:00
committed by David S. Miller
parent 906e8d9792
commit 7d3cabbcc8
3 changed files with 110 additions and 7 deletions
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6
drivers/net/e1000e/lib.c
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@ -378,12 +378,6 @@ s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
mac->get_link_status = 0;
if (hw->phy.type == e1000_phy_82578) {
ret_val = e1000_link_stall_workaround_hv(hw);
if (ret_val)
return ret_val;
}
/*
* Check if there was DownShift, must be checked
* immediately after link-up