USB OTG vs USB HOST with UVC camera

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Hi,

I'm working with an UVC camera (Targus AVC05EU) and I noticed that  
when I connect the camera to the USB host I 
can get images up to  
640x480, instead when I plug it to the USB otg I can get only images  
up to 352x288. If I try 
requesting higher resolution I get EAGAIN  
error and select timeout.
I used v4l2 to grab the frames.
I tried 
connecting an external powered hub and nothing changes.
Do you have some hints?

Thank you,

Stefano 
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