i have found the document Thank you very much.
current to the USB host controllers during hibernation. (It's
possible to work around the hibernation-forces-disconnect problem by
using the USB Persist facility.)
The reset_resume method is used by the USB Persist facility (see
Documentation/usb/persist.txt) and it can also be used under certain
circumstances when CONFIG_USB_PERSIST is not enabled. Currently, if a
device is reset during a resume and the driver does not have a
reset_resume method, the driver won't receive any notification about
the resume. Later kernels will call the driver's disconnect method;
2.6.23 doesn't do this.
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.
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