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e1000e: provide comment for 82571 workaround

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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 2009-11-20 23:26:24 +00:00 committed by David S. Miller
parent fe4016746d
commit 84efb7b968
1 changed files with 7 additions and 0 deletions
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7
drivers/net/e1000e/82571.c
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@ -1114,6 +1114,13 @@ static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw)
reg |= (1 << 22); reg |= (1 << 22);
ew32(GCR, reg); ew32(GCR, reg);
/*
* Workaround for hardware errata.
* apply workaround for hardware errata documented in errata
* docs Fixes issue where some error prone or unreliable PCIe
* completions are occurring, particularly with ASPM enabled.
* Without fix, issue can cause tx timeouts.
*/
reg = er32(GCR2); reg = er32(GCR2);
reg |= 1; reg |= 1;
ew32(GCR2, reg); ew32(GCR2, reg);