[PATCH 0/6 V2][SRU][Lunar] Fix only reach PC3 when ethernet is plugged r8169

[Koba Ko]

BugLink: https://bugs.launchpad.net/bugs/1946433

[impact]
Restrictions on enabling ASPM prevented power savings when the network is not fully loaded. 
Keeping ASPM enabled during NAPI poll can cause issues 
like rx_missed errors or tx timeouts on some chip versions. 
The root causes of these issues are unknown.

[fix] 
- Remove unnecessary ASPM restrictions to allow enabling ASPM more often, increasing power savings.
- Disable ASPM during NAPI poll to avoid issues on some chip versions.

[test cases]
1. don't ping or make data transacation through ethernet.
2. check /sys/kernel/debug/pmc_core_package_cstate_show

[where the issue could happen]
low, this increases both performance and stablility.

[Misc]
All patches landed on unstable.

~~~
V2: SRUed the cleaner version that have landsed on vanilla kernel.

Heiner Kallweit (6):
  r8169: use spinlock to protect mac ocp register access
  r8169: use spinlock to protect access to registers Config2 and Config5
  r8169: enable cfg9346 config register access in atomic context
  r8169: prepare rtl_hw_aspm_clkreq_enable for usage in atomic context
  r8169: disable ASPM during NAPI poll
  r8169: remove ASPM restrictions now that ASPM is disabled during NAPI
    poll

 drivers/net/ethernet/realtek/r8169_main.c | 145 +++++++++++++++-------
 1 file changed, 100 insertions(+), 45 deletions(-)

-- 
2.25.1