Re: [RFC PATCH] usb/acpi: Add support usb port power off mechanism for device fixed on the motherboard

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On Fri, 11 May 2012, Sarah Sharp wrote:

> On Fri, May 11, 2012 at 07:54:04PM +0000, Lan, Tianyu wrote:
> > On 2012/5/12 1:44, Alan Stern wrote:
> > > This doesn't matter.  Disconnections will be handled by 
> > > usb_reset_and_verify_device(), when it is called by 
> > > finish_port_resume().
> > This will cause the device to be re-enumerated. Just like
> > unplugged and plugged a device. I think this is not what
> > we want.  Disconnect and create the same device. device
> > num is also change.
> 
> Tianyu, do you have CONFIG_USB_PERSIST turned on?
> 
> Alan, do you know if that will that only help in this case after the
> host controller PCI device is in D3hot?

See check_port_resume_type() in hub.c.  It doesn't care what the reason
is for loss connectivity during suspend or what state the host
controller was in.

Alan Stern

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