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authorJesse Brandeburg <jesse.brandeburg@intel.com>2009-01-26 12:16:26 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-26 12:16:26 -0800
commit78272bbab895cc8f63bab5181dee55b72208e3b7 (patch)
tree53aa763c515170daaf60b433e251afa842009719 /drivers/net/e1000e/82571.c
parent71be7a36026b25e17657ff8e4317837176bf8cfd (diff)
e1000e: workaround hw errata
There is a hardware errata in some revisions of the 82574 that needs to be worked around in the driver by setting a register bit at init. If this bit is not set A0 versions of the 82574 can generate tx hangs. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> 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>
Diffstat (limited to 'drivers/net/e1000e/82571.c')
-rw-r--r--drivers/net/e1000e/82571.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index cf43ee743b3c..0890162953e9 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -981,11 +981,15 @@ static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw)
ew32(PBA_ECC, reg);
}
- /* PCI-Ex Control Register */
+ /* PCI-Ex Control Registers */
if (hw->mac.type == e1000_82574) {
reg = er32(GCR);
reg |= (1 << 22);
ew32(GCR, reg);
+
+ reg = er32(GCR2);
+ reg |= 1;
+ ew32(GCR2, reg);
}
return;