omap: USB host disconnects connecting a device through USB HUB

omap: USB host disconnects connecting a device through USB HUB

[Enric Balletbò i Serra]

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
  1. if power up the board with the USB HUB connected to the USB Host
port and the device connected to the USB hub.
  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 ?

Regards,
   Enric Balletbò i Serra
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Re: omap: USB host disconnects connecting a device through USB HUB

[Alan Stern]

On Thu, 7 Apr 2011, Enric Balletbò 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
>   1. if power up the board with the USB HUB connected to the USB Host
> port and the device connected to the USB hub.
>   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.  Current inrush 
when the device is plugged in, or something like that.

What happens if you attach the hub and pendrive to a standard PC?

Alan Stern

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

[Enric Balletbò i Serra]

Hi,

2011/4/7 Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>:
> On Thu, 7 Apr 2011, Enric Balletbò 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
>>   1. if power up the board with the USB HUB connected to the USB Host
>> port and the device connected to the USB hub.
>>   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.  Current 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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Re: omap: USB host disconnects connecting a device through USB HUB

[Felipe Balbi]

On Thu, Apr 07, 2011 at 11:03:38PM +0200, Enric Balletbò i Serra wrote:
> Hi,
> 
> 2011/4/7 Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>:
> > On Thu, 7 Apr 2011, Enric Balletbò 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
> >>   1. if power up the board with the USB HUB connected to the USB Host
> >> port and the device connected to the USB hub.
> >>   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.  Current 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 ?

Maybe PM is kicking in and turning off the clocks. Donno. What if you
use function tracer so we know the last called function before the
problem ? Just filter the call to *hci*.

-- 
balbi
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