[Bug 1976438] [NEW] Fix sub-optimal I210 network speed

Public bug reported:

[Impact]
I210 may not reach maximum speed on Intel Alder Lake platforms.

[Fix]
Following the datasheet to ensure I210 is not in idle state when CPU is
using PCIe link to perform TX.

[Test]
With the fix applied, the I210 TX/RX speed can reach ~94x MBps.

[Where problems could occur]
Since this changes how hardware idles, it can slightly increase power
consumption.

** Affects: hwe-next
Importance: Undecided
Status: New

** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete

** Affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: New

** Affects: linux-oem-5.17 (Ubuntu)
Importance: Undecided
Status: New

** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Won't Fix

** Affects: linux-oem-5.14 (Ubuntu Focal)
Importance: Medium
Status: Confirmed

** Affects: linux-oem-5.17 (Ubuntu Focal)
Importance: Undecided
Status: Invalid

** Affects: linux (Ubuntu Jammy)
Importance: Medium
Status: Confirmed

** Affects: linux-oem-5.14 (Ubuntu Jammy)
Importance: Undecided
Status: Invalid

** Affects: linux-oem-5.17 (Ubuntu Jammy)
Importance: Medium
Status: Confirmed


** Tags: oem-priority originate-from-1968653 sutton

** Also affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.17 (Ubuntu)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.14 (Ubuntu Focal)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.17 (Ubuntu Focal)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.14 (Ubuntu Jammy)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.17 (Ubuntu Jammy)
Importance: Undecided
Status: New

** Changed in: linux (Ubuntu Focal)
Status: New => Won't Fix

** Changed in: linux (Ubuntu Jammy)
Status: New => Confirmed

** Changed in: linux-oem-5.14 (Ubuntu Focal)
Status: New => Confirmed

** Changed in: linux-oem-5.14 (Ubuntu Jammy)
Status: New => Invalid

** Changed in: linux-oem-5.17 (Ubuntu Focal)
Status: New => Invalid

** Changed in: linux-oem-5.17 (Ubuntu Jammy)
Status: New => Confirmed

** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium

** Changed in: linux-oem-5.14 (Ubuntu Focal)
Importance: Undecided => Medium

** Changed in: linux-oem-5.17 (Ubuntu Jammy)
Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1976438

Title:
Fix sub-optimal I210 network speed

Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-5.14 package in Ubuntu:
New
Status in linux-oem-5.17 package in Ubuntu:
New
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.14 source package in Focal:
Confirmed
Status in linux-oem-5.17 source package in Focal:
Invalid
Status in linux source package in Jammy:
Confirmed
Status in linux-oem-5.14 source package in Jammy:
Invalid
Status in linux-oem-5.17 source package in Jammy:
Confirmed

Bug description:
[Impact]
I210 may not reach maximum speed on Intel Alder Lake platforms.

[Fix]
Following the datasheet to ensure I210 is not in idle state when CPU is
using PCIe link to perform TX.

[Test]
With the fix applied, the I210 TX/RX speed can reach ~94x MBps.

[Where problems could occur]
Since this changes how hardware idles, it can slightly increase power
consumption.

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