[bugzilla-daemon@xxxxxxxxxx: [Bug 218765] New: broken device, retraining non-functional downstream link at 2.5GT/s]

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FYI.  The retraining was added by a89c82249c37 ("PCI: Work around PCIe
link training failures").

Paul, is this a regression?  a89c82249c37 appeared in v6.5.  I
*assume* whatever is below bus 01 did actually work before v6.5, in
spite of the fact that apparently PCI_EXP_LNKSTA_DLLLA was not set 
when we enumerated the 00:1c.0 Root Port?

----- Forwarded message from bugzilla-daemon@xxxxxxxxxx -----

https://bugzilla.kernel.org/show_bug.cgi?id=218765

Created attachment 306199
  --> https://bugzilla.kernel.org/attachment.cgi?id=306199&action=edit
Linux 6.9-rc5+ messages (output of `dmesg`)

I noticed a one second delay with Linux 6.9-rc5+:

```
[    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022
[…]
[    0.201109] pci 0000:00:1c.0: [8086:9d10] type 01 class 0x060400 PCIe Root
Port
[    0.201109] pci 0000:00:1c.0: PCI bridge to [bus 01-39]
[    0.201109] pci 0000:00:1c.0:   bridge window [mem 0xc4000000-0xda0fffff]
[    0.201109] pci 0000:00:1c.0:   bridge window [mem 0xa0000000-0xc1ffffff
64bit pref]
[    0.201109] pci 0000:00:1c.0: broken device, retraining non-functional
downstream link at 2.5GT/s
[    1.209109] pci 0000:00:1c.0: retraining failed
[    1.209143] pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
[    1.209677] pci 0000:00:1c.4: [8086:9d14] type 01 class 0x060400 PCIe Root
Port
[    1.209700] pci 0000:00:1c.4: PCI bridge to [bus 3a]
[    1.209705] pci 0000:00:1c.4:   bridge window [mem 0xdc000000-0xdc1fffff]
[    1.209771] pci 0000:00:1c.4: PME# supported from D0 D3hot D3cold
[…]
```

Looking through all the logs since March 2024, I only found *one* other
occurrence with Linux 6.9-rc4+.

```
$ lspci -tvnn
-[0000:00]-+-00.0  Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor
Host Bridge/DRAM Registers [8086:5904]
           +-02.0  Intel Corporation HD Graphics 620 [8086:5916]
           +-04.0  Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core
Processor Thermal Subsystem [8086:1903]
           +-14.0  Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller
[8086:9d2f]
           +-14.2  Intel Corporation Sunrise Point-LP Thermal subsystem
[8086:9d31]
           +-15.0  Intel Corporation Sunrise Point-LP Serial IO I2C Controller
#0 [8086:9d60]
           +-15.1  Intel Corporation Sunrise Point-LP Serial IO I2C Controller
#1 [8086:9d61]
           +-16.0  Intel Corporation Sunrise Point-LP CSME HECI #1 [8086:9d3a]
           +-1c.0-[01-39]----00.0-[02-39]--+-00.0-[03]--
           |                               +-01.0-[04-38]--
           |                               \-02.0-[39]----00.0  Intel
Corporation DSL6340 USB 3.1 Controller [Alpine Ridge] [8086:15b5]
           +-1c.4-[3a]----00.0  Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter [168c:003e]
           +-1d.0-[3b]----00.0  SK hynix PC300 NVMe Solid State Drive 512GB
[1c5c:1284]
           +-1f.0  Intel Corporation Sunrise Point-LP LPC Controller
[8086:9d58]
           +-1f.2  Intel Corporation Sunrise Point-LP PMC [8086:9d21]
           +-1f.3  Intel Corporation Sunrise Point-LP HD Audio [8086:9d71]
           \-1f.4  Intel Corporation Sunrise Point-LP SMBus [8086:9d23]
```

The adapter wasn’t plugged in, when Linux started.

It could be related to unplugging an Dell DA300 USB Type-C adapter during
system firmware (UEFI) to avoid a five second delay in Linux (ACPI). I need to
test that later, but maybe you already have an idea.

----- End forwarded message -----




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