[Bug 272360] System crash when drive goes idle

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272360

Tomoaki AOKI <junchoon@dec.sakura.ne.jp> changed:

           What    |Removed                     |Added
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                 CC|                            |junchoon@dec.sakura.ne.jp

--- Comment #2 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
Just a annoying possibility, but if you attach ThunderBolt-only (or possibly
ThunderBolt-capable) external drive to ThunderBolt-capable Type-C port ON BOOT,
it may be recognized as PCIe-attached controller and attached drive.

This case, if the drive goes sleep WITH ITS CONTROLLER, it means that
PCIe-attached controller suddernly disappear from FreeBSD side.
It surely causes hang, unless the port and controller are considered as
pluggable.

For me, if I attach TB3-only SSD to TB3-capable Type-C port on my ThinkPad P52,
  *attaching BEFORE powering on: Recognized as ada drive.
  *attaching AFTER boot: Not at all recognized. Nothing happenes.

On-developing hps@'s USB4/TB3 driver [1] doesn't recognize the drive on both
cases.
It would be because ntel Titan Ridge Thunderbolt 3 USB controller on my P52 is
noto yet supported enough.
nhi_wmi0: <Thunderbolt WMI Endpoint> on acpi_wmi0 appears on dmesg, but that's
all.
Always treated as xchi1.

[1] https://github.com/hselasky/usb4

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