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imx6q usb disconnect issue

Question asked by Angelo Dureghello on Jan 13, 2016
Latest reply on Jan 22, 2016 by igorpadykov

Dear all,

 

i have this scenario in a similar sabrelite custom board (without usb hub onboard chip), and kernel 3,14.

 

USB connector ---> USB external 2.0 HUB (non powered)

 

On the hub i have a small keyboard and filesystem stick.

Consumption on VBUS is, as above, 80mA. VBUS at connector is 4,98V.

 

I connect now 2 USB powered spekers on the hub (low volume).

VBUS moves to  4,96, current to 140mA abt. But i get a disconnect message about the

usb filesystem stick from the kernel.

 

localhost login: 
usb 2-1: USB disconnect, device number 2
usb 2-1.1: USB disconnect, device number 3

 

I don't have any evidence of VBUS issues, board can source 1050mA.

 

Seems a disconenct due to the data line signals.

There could be some driver issue afayk ? Or it could be some host register to set better ?

Every help is really appreciated.

 

Thanks,

angelo

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