Re: omap: USB host disconnects connecting a device through USB HUB

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Hi,

2011/4/7 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>:
> On Thu, 7 Apr 2011, Enric Balletbà i Serra wrote:
>
>> Hi all,
>>
>> I'm experimenting some issues with USB on IGEP v2 board, in certain
>> cases I've an USB disconnect when I plug a device. For me it fails
>> with kernel 2.6.35 but I think it also affect newer kernel, the issue
>> is easy to reproduce following these steps:
>>
>> 1. Power up the board (without any device connected )
>>
>> 2. When kernel is up, connect a powered USB HUB 2.0 to the USB host
>> port, kernel shows,
>>
>> usb 1-1: new high speed USB device using ehci-omap and address 2
>> usb 1-1: New USB device found, idVendor=05e3, idProduct=0608
>> usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
>> usb 1-1: Product: USB2.0 Hub
>> hub 1-1:1.0: USB hub found
>> hub 1-1:1.0: 4 ports detected
>> usb 1-1.4: new high speed USB device using ehci-omap and address 3
>> usb 1-1.4: New USB device found, idVendor=05e3, idProduct=0608
>> usb 1-1.4: New USB device strings: Mfr=0, Product=1, SerialNumber=0
>> usb 1-1.4: Product: USB2.0 Hub
>> hub 1-1.4:1.0: USB hub found
>> hub 1-1.4:1.0: 4 ports detected
>>
>> 3. Then if I connect a device (for example a pendrive) to the HUB I
>> get USB disconnect message
>>
>> usb 1-1: USB disconnect, address 2
>> usb 1-1.4: USB disconnect, address 3
>>
>> OTOH, it works without problem
>> Â 1. if power up the board with the USB HUB connected to the USB Host
>> port and the device connected to the USB hub.
>> Â 2. if after kernel is up, connect the USB HUB + device to the USB Host port
>>
>> Anyone is experimenting something like this with other OMAP3-based boards ?
>
> At first glance, it looks like a power-related issue. ÂCurrent inrush
> when the device is plugged in, or something like that.
>
> What happens if you attach the hub and pendrive to a standard PC?
>

With standard PC works as expected, would be possible a problem with
omap-ehci driver ? Maybe Felipe can give some light ?

> Alan Stern
>
>
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