Fixing low-speed USB keyboard detection

[Stefan]

Hello Soeren!

It will take me some time to prepare a proper patch, I just found the documentation of your patman tool. I am using Guix and created a package definition for U-Boot with these three fixes using regexp substitutions.

My time is quite limited for this weekend. I guess that you would be much faster preparing these three simple changes as a patch. So I would be glad, if you prepare a patch.

A proper commit message could be this: “This patch works around issues of low-speed USB keyboards with the dwc2 USB interface. There was a need to press a key when "USB0: scanning bus 0 for devices..." was printed or otherwise there was the error "Timeout poll on interrupt endpoint" and the keyboard was not usable. This patch reverts the workaround from 5da2dc9789abecb1b018beb0c93f4c38c2985bc6 for non-working keyboards.”


Stefan


> Am 29.02.2020 um 13:04 schrieb Soeren Moch <smoch at web.de>:
> 
> 
> 
> On 29.02.20 00:46, Marek Vasut wrote:
>> On 2/26/20 12:04 PM, Soeren Moch wrote:
>>> Adding Marek as USB maintainer. Otherwise this non-patch-email may get
>>> lost when sent to the mailing list only.
>> Well, can you send these as proper patches ?
> Well, I can try to make a proposal for patches. But I cannot test
> something since I neither own such D-Link DBT-120 Bluetooth Adapter, nor
> a Raspberry Pi 3b as host system. I'm also not familiar with the details
> of event polling / interrupt message NYET handling in u-boot, so
> probably will not come up with a good commit message about this. I also
> cannot judge which workaround or revert of such is appropriate.
> 
> Stefan, can you convert your fixes to proper patches yourself, or do you
> want me to send a first proposal?
> 
> Thanks,
> Soeren
>> 
>>> Soeren
>>> 
>>> On 25.02.20 18:45, Stefan wrote:
>>>> Hello!
>>>> 
>>>> I own a D-Link DBT-120 Bluetooth Adapter, which has a CSR firmware running in a so called “HID proxy mode”. This firmware pretends to be a USB keyboard (and mouse) and thus allows to use a Bluetooth keyboard in U-Boot.
>>>> 
>>>> Unfortunately it acts as a low-speed device and there seems to be some well known troubles about low-speed USB keyboards. There is a FAQ entry for openSUSE about this: https://en.opensuse.org/HCL:Raspberry_Pi3#I_cannot_use_keyboard_in_U-Boot_and_Grub_but_it_works_in_Linux
>>>> 
>>>> I spend some effort to solve this issue. There are three tiny changes to get my Bluetooth keyboard working reliably as a low-speed USB keyboard.
>> [...]
> 
>