PCI: Add pci_host_common_link_train_delay() helper

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PCIe r6.0, sec 6.6.1 (Conventional Reset) requires that for a Downstream
Port supporting Link speeds greater than 5.0 GT/s, software must wait a
minimum of 100 ms after Link training completes before sending any
Configuration Request.

Introduce a static inline helper pci_host_common_link_train_delay() that
checks the given max_link_speed (2 = 5.0 GT/s, 3 = 8.0 GT/s, etc.) and
calls msleep(100) only when the speed is greater than 5.0 GT/s.

This allows multiple host controller drivers to share the same mandatory
delay without duplicating the logic.

Signed-off-by: Hans Zhang <18255117159@163.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20260518004246.1384532-2-18255117159@163.com

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Hans Zhang 2026-05-18 08:42:40 +08:00 • committed by Manivannan Sadhasivam

parent 254f49634e

commit 29fbf582e7

1 changed files with 17 additions and 0 deletions

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drivers/pci/controller/pci-host-common.h

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