[PATCH v7 0/3] PCI: Refactor PCIe speed validation and conversion functions

[Hans Zhang]

This series refactors PCIe speed validation and conversion logic to
shared functions in the public header, eliminating code duplication
and ensuring consistency across drivers.

---
Changes for v7:
- patch 0002 add #include <asm/bug.h> (Ilpo)
- s/u32 link_speed/enum pci_bus_speed link_speed/ (Ilpo)
- The return value of pci_bus_speed2lnkctl2 uses the variable ctrl2_speed
  to avoid the abuse of variable types. (Ilpo)

Changes for v6:
https://patchwork.kernel.org/project/linux-pci/patch/20260406105613.1228673-1-18255117159@xxxxxxx/

- missing one line of code:
  link_speed = pcie_get_link_speed(pci->max_link_speed); 

Changes for v5:
https://patchwork.kernel.org/project/linux-pci/patch/20260406104708.1218648-1-18255117159@xxxxxxx/

- Rebase to v7.0-rc1. (pci/next tree)

Changes for v4:
https://patchwork.kernel.org/project/linux-pci/patch/20251102143206.111347-1-18255117159@xxxxxxx/

- Maintain O(1) array-based lookup for speed conversion (addressing
  performance concerns from v3 feedback)
- Move pcie_valid_speed() and pci_bus_speed2lnkctl2() to pci.h
- Update dwc driver to use the shared functions
- Rebase to v6.18-rc3.

This addresses the feedback from Lukas Wunner and Manivannan Sadhasivam
on the v3 submission, ensuring no runtime performance regression while
achieving code reuse.

Changes for v3:
https://patchwork.kernel.org/project/linux-pci/patch/20250816154633.338653-1-18255117159@xxxxxxx/

- Rebase to v6.17-rc1.
- Gentle ping.

Changes for v2:
- s/PCIE_SPEED2LNKCTL2_TLS_ENC/PCIE_SPEED2LNKCTL2_TLS
- The patch commit message were modified.
---

Hans Zhang (3):
  PCI: Add public pcie_valid_speed() for shared validation
  PCI: Move pci_bus_speed2lnkctl2() to public header
  PCI: dwc: Use common speed conversion function

 drivers/pci/controller/dwc/pcie-designware.c | 28 +++++++-------------
 drivers/pci/pci.h                            | 23 ++++++++++++++++
 drivers/pci/pcie/bwctrl.c                    | 22 ---------------
 3 files changed, 32 insertions(+), 41 deletions(-)


base-commit: 525e91d84dc085492b36d4b87abb7c1cc93fcb44
-- 
2.34.1