21.10.2021 22:14, Alan Stern пишет:
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Should USB keyboard be able to wake up every HC or it's a
machine-specific feature?

I mean whether key press should wake up HC if wake-up is enabled for the
keyboard device.

Yes, it should.  More specifically, if the keyboard is capable of 
generating wakeup requests, and wakeup is enabled for both the keyboard 
device and the HC, then the keyboard should be able to wake up the 
system from suspend.  Some HCs or systems might not support this 
capability, however.

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I'm asking because wakeup works on a typical
Intel hardware, but doesn't work on older Tegra SoCs that use Chipidea
controller. It's not obvious to me whether this is something that
firmware handles for Intel or it's broken on Tegra. Could you please
clarify? If it should work for every HC, then I may try to take a closer
look.

If the hardware/firmware can support it then it should work.  I don't 
know what's going on with your older Tegra SoCs; it's possible there is 
a bug in the driver.

I'll take a closer look then, thank you.