[Bug 219387] Bluetooth: hci0: Reading supported features failed (-16)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219387

potefa (tynsareatger@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |tynsareatger@gmail.com

--- Comment #12 from potefa (tynsareatger@gmail.com) ---
We found some USB devices (keyboard, storage) will fail to be detected on
kernel 5.13 during boot, but it's working OK after re-plug the device. After
looking into the dmesg during boot, there's an error message as down below
[   39.350435] hub 1-0:1.0: USB hub found
[   39.398835] hub 1-0:1.0: 12 ports detected
[   39.622744] usb usb1-port3: couldn't allocate usb_device

Then we try to reproduce it on older kernel (5.4 and 5.8), there's no such
problem. After bisecting, we found the commit
https://github.com/torvalds/linux/commit/90d28fb53d4a51299ff324dede015d5cb11b88a2
https://speedstars-unblocked.github.io makes the difference. It seems that
hub_power_on_good_delay is not long enough for this hub. The bPwrOn2PwrGood in
the Hub Descriptor (please refer to the attached lsusb-v.txt) is 20ms, which
seems pretty normal when I check the same thing on other hubs. Can we totally
trust this? Please suggest what we should do for this kind of hub. Thanks

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