[PATCH 0/3 V2][SRU][OEM-6.0/OEM-5.17] UBUNTU: SAUCE: Can only reach PC3 when ethernet is plugged r8169

[Koba Ko]

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

[Impact]
System only can reach PC3, and it affects power consumption alot.

[Fix]
Kaiheng implemented a dynamic ASPM for r8169, it not only fixes the PC state issue, but also fixes network speed issue.
V7:
https://patchwork.kernel.org/project/netdevbpf/patch/20211016075442.650311-5-kai.heng.feng@canonical.com/
V6:
https://patchwork.ozlabs.org/project/linux-pci/cover/20211007161552.272771-1-kai.heng.feng@canonical.com/

[Test]
Verified on 2 different systems which has PC state issue and has network speed issue, these patches fix both issues.

[Where problems could occur]
It toggles ASPM on and off depends on the network traffic during runtime, I don't think it'll lead to any regressions. Some potential issues have been addressed during the patch submitting. It's v6 now and accepted by upstream.

~~~
V2: mark as SAUCE.

Kai-Heng Feng (3):
  [OEM-6.0/OEM-5.17] r8169: Enable chip-specific ASPM regardless of
    PCIe ASPM status
  [OEM-6.0/OEM-5.17] r8169: Use mutex to guard config register
    locking
  [OEM-6.0/OEM-5.17] r8169: Implement dynamic ASPM mechanism

 drivers/net/ethernet/realtek/r8169_main.c | 77 ++++++++++++++++++-----
 drivers/pci/pcie/aspm.c                   |  1 +
 2 files changed, 62 insertions(+), 16 deletions(-)

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2.34.1