Re: [PATCH v4 0/7] PCI: Add common helper for 100 ms delay after link training
Manivannan Sadhasivam <[email protected]>
| Newsgroups | org.kernel.vger.linux-omap,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-mediatek,org.kernel.vger.linux-kernel,org.kernel.vger.linux-pci,org.kernel.vger.linux-renesas-soc |
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| Message-ID | <[email protected]> |
On Mon, 18 May 2026 08:42:39 +0800, Hans Zhang wrote:
> 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.
>
> Several PCIe host controller drivers currently omit this 100 ms delay
> when the negotiated link speed is Gen3 (8 GT/s) or higher. Only the DWC
> driver already implements it. The missing delay can lead to violations
> of the PCIe specification and cause enumeration failures with high-speed
> devices (e.g., NVIDIA RTX5070 GPU, PCIe 5.0 NVMe SSDs).
>
> [...]
Applied, thanks!
[1/7] PCI: Add pci_host_common_link_train_delay() helper
commit: 29fbf582e75015c031e7965fdd4084af123b9ca2
[2/7] PCI: cadence: Add post-link delay for LGA and j721e glue driver
commit: 869317b95fd735684057666a65dd8ef95d4bd669
[3/7] PCI: cadence: HPA: Add post-link delay
commit: 8dd5d65d0dc750b6890c0102c3992f4cef516196
[4/7] PCI: dwc: Use common pci_host_common_link_train_delay() helper
commit: 681adc339e4c972b9f7a5ef8c2fb6a2f7737d4db
[5/7] PCI: aardvark: Add 100 ms delay after link training
commit: 8a602b8bfebbf9a755e8f4732132719a3b298b29
[6/7] PCI: mediatek-gen3: Add 100 ms delay after link up
commit: 798a96740d61c24f193b82388b681b6a4f102d3b
[7/7] PCI: rzg3s-host: Use common pci_host_common_link_train_delay() helper
commit: 0ae259d0434bc31fc71696355538fd21027d6ebe
Best regards,
--
Manivannan Sadhasivam <[email protected]>