[PATCH v2 0/2][SRU][Jammy] e1000e report hardware hang

[AceLan Kao]

From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1973104

[Impact]
e1000e hardware unit hang after s2idle
May 06 15:34:49 ubuntu kernel: e1000e 0000:00:1f.6 enp0s31f6: Detected Hardware Unit Hang:
                                 TDH <1>
                                 TDT <5>
                                 next_to_use <5>
                                 next_to_clean <1>
                               buffer_info[next_to_clean]:
                                 time_stamp <1000587f0>
                                 next_to_watch <1>
                                 jiffies <1000589c0>
                                 next_to_watch.status <0>
                               MAC Status <40080283>
                               PHY Status <796d>
                               PHY 1000BASE-T Status <3800>
                               PHY Extended Status <3000>
                               PCI Status <10>

[Fix]
Below commits fix this issue which have been included in v5.19-rc8
https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20220508070905.1878172-1-sasha.neftin@intel.com/

6cfa45361d3e Revert "e1000e: Fix possible HW unit hang after an s0ix exit"
b49feacbeffc e1000e: Enable GPT clock before sending message to CSME

[Test]
Verified on the target machine, and confirmed the issue is gone.

[Where problems could occur]
The impact is low, it keeps the GPT clock enabled for CSME when
e1000e_pm_resume() is called. With the new fix, the old workaround could
be removed. I can't see this may introduce any regression.

Sasha Neftin (2):
  e1000e: Enable GPT clock before sending message to CSME
  Revert "e1000e: Fix possible HW unit hang after an s0ix exit"

 drivers/net/ethernet/intel/e1000e/hw.h      |  1 -
 drivers/net/ethernet/intel/e1000e/ich8lan.c |  4 ---
 drivers/net/ethernet/intel/e1000e/ich8lan.h |  1 -
 drivers/net/ethernet/intel/e1000e/netdev.c  | 30 +++------------------
 4 files changed, 4 insertions(+), 32 deletions(-)

-- 
2.25.1