[Bug 2106251] [NEW] Backport "PCI: Wait for device readiness with Configuration RRS" to N/O

Public bug reported:

GCP is requesting a backport of the patch d591f6804e7e "PCI: Wait for
device readiness with Configuration RRS" from upstream to the Noble and
Oracular kernels.

The following patches are required for the backport:
d591f6804e7e1310881c9224d72247a2b65039af PCI: Wait for device readiness with Configuration RRS
ce526e1b29c70cff175e3ab8d9cb7e3f24321498 PCI: Avoid FLR for Mediatek MT7922 WiFi

Impact:
- GCP states that they would like to leverage the flexibility that the patch affords over and above the typical PCI quirks treatment.

Testing:
- Boot-tested the changes in GCP environment on amd64 hardware.

Regression potential:
- The changes affect the PCI core and the Mediatek MT7922 WiFi driver. The PCI core is affected in the device wait logic. Latency between device reset and configuration accesses may be altered. The Mediatek driver introduces a quirk that specifies those devices don't implement FLR.

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

** Affects: linux (Ubuntu Noble)
Importance: Undecided
Assignee: Tim Whisonant (tswhison)
Status: In Progress

** Affects: linux (Ubuntu Oracular)
Importance: Undecided
Assignee: Tim Whisonant (tswhison)
Status: In Progress

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

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

** Changed in: linux (Ubuntu Noble)
Status: New => In Progress

** Changed in: linux (Ubuntu Noble)
Assignee: (unassigned) => Tim Whisonant (tswhison)

** Changed in: linux (Ubuntu Oracular)
Status: New => In Progress

** Changed in: linux (Ubuntu Oracular)
Assignee: (unassigned) => Tim Whisonant (tswhison)

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

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https://bugs.launchpad.net/bugs/2106251

Title:
Backport "PCI: Wait for device readiness with Configuration RRS" to
N/O

Status in linux package in Ubuntu:
Invalid
Status in linux source package in Noble:
In Progress
Status in linux source package in Oracular:
In Progress

Bug description:
GCP is requesting a backport of the patch d591f6804e7e "PCI: Wait for
device readiness with Configuration RRS" from upstream to the Noble
and Oracular kernels.

The following patches are required for the backport:
d591f6804e7e1310881c9224d72247a2b65039af PCI: Wait for device readiness with Configuration RRS
ce526e1b29c70cff175e3ab8d9cb7e3f24321498 PCI: Avoid FLR for Mediatek MT7922 WiFi

Impact:
- GCP states that they would like to leverage the flexibility that the patch affords over and above the typical PCI quirks treatment.

Testing:
- Boot-tested the changes in GCP environment on amd64 hardware.

Regression potential:
- The changes affect the PCI core and the Mediatek MT7922 WiFi driver. The PCI core is affected in the device wait logic. Latency between device reset and configuration accesses may be altered. The Mediatek driver introduces a quirk that specifies those devices don't implement FLR.

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