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>
diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index cf43ee74..0890162 100644
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -981,11 +981,15 @@
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;