linux-kernel - [PATCH v4 0/3] PCI: Refactor PCIe speed validation and conversion functions

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Message-Id: <20251102143206.111347-1-18255117159@163.com>
Date: Sun,  2 Nov 2025 22:32:03 +0800
From: Hans Zhang <18255117159@....com>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	kwilczynski@...nel.org,
	mani@...nel.org,
	ilpo.jarvinen@...ux.intel.com,
	jingoohan1@...il.com
Cc: robh@...nel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hans Zhang <18255117159@....com>
Subject: [PATCH v4 0/3] PCI: Refactor PCIe speed validation and conversion functions

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 v4:
- 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@163.com/

- 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 | 18 +++-------------
 drivers/pci/pci.h                            | 22 ++++++++++++++++++++
 drivers/pci/pcie/bwctrl.c                    | 22 --------------------
 3 files changed, 25 insertions(+), 37 deletions(-)


base-commit: 691d401c7e0e5ea34ac6f8151bc0696db1b2500a
-- 
2.34.1