e1000e: 82579 intermittently disabled during S0->Sx
authorBruce Allan <bruce.w.allan@intel.com>
Fri, 13 May 2011 07:19:48 +0000 (07:19 +0000)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Fri, 10 Jun 2011 03:31:49 +0000 (20:31 -0700)
commit99730e4c13c8344b02dd96108945b48d28c14c25
tree36ae5f5c6bf0804f45dfb387931f88d11f7bc400
parentd9b24135b972ccdd5f5174fba06c730e895e6daf
e1000e: 82579 intermittently disabled during S0->Sx

When repeatedly cycling Sx->S0 states with the network cable unplugged,
the 82579 PHY may not initialize as expected and may require a full power
cycle to recover functionality to the device.  Workaround this by testing
access of the PHY registers after resuming; if that returns unexpected
results toggle the LANPHYPC signal to power cycle the PHY.

This is implemented in the new function e1000_resume_workarounds_pchlan()
which calls another new function, e1000_toggle_lanphypc_value_ich8lan(),
which has been created to reduce code duplication (same functionality
required by a previous workaround).  Also, e1000e_disable_gig_wol_ich8lan
is now e1000_suspend_workarounds_ich8lan to better reflect what it does.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
drivers/net/e1000e/e1000.h
drivers/net/e1000e/ich8lan.c
drivers/net/e1000e/netdev.c