Comment 2 for bug 1949353

https://lists.ubuntu.com/archives/kernel-team/2021-November/125883.html

BugLink: https://bugs.launchpad.net/bugs/1951861

[Impact]
e1000e devices stop working after s2idle resume.

[Fix]
Revert the offending patch series, which is to bring some minor power
saving.

[Test]
Vendor did extensive tests and didn't find any regression, and the power
consumption remains the same.

[Where problems could occur]
Maybe on some system the series can save some energy, so reverting will
cause some power consumption increase.

Kai-Heng Feng (3):
  Revert "e1000e: Additional PHY power saving in S0ix"
  Revert "e1000e: Add polling mechanism to indicate CSME DPG exit"
  Revert "e1000e: Add handshake with the CSME to support S0ix"

 drivers/net/ethernet/intel/e1000e/ich8lan.h | 3 -
 drivers/net/ethernet/intel/e1000e/netdev.c | 358 +++++++++-----------
 drivers/net/ethernet/intel/e1000e/regs.h | 1 -
 3 files changed, 154 insertions(+), 208 deletions(-)