Thank you for your reply. i also want  to know by do this, do other devices 
also can do suspending ?

gavin.kx

From: Alan Stern
Date: 2013-01-11 23:11
To: gavin.kx
CC: linux-usb
Subject: Re: how to disable usb hub suspend function
On Fri, 11 Jan 2013, gavin.kx wrote:

> Dear sir:
> i have a project that need disable usb hub suspend function, How can i do ? 
> Thank you !

You can prevent any USB device from suspending by doing:

echo on >/sys/bus/usb/devices/.../power/control

Fill in the "..." part with the path for the device you want.

Alan 
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