From: Oliver Neukum <oliver@neukum.org>
To: Felipe Balbi <me@felipebalbi.com>
Subject: Re: USB deadlock after resume
Date: Wed, 21 Nov 2007 16:10:58 +0100
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Cc: Markus Rechberger <mrechberger@gmail.com>, Mark Lord <lkml@rtr.ca>,
       linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net,
       Laurent Pinchart <laurentp@cse-semaphore.com>
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Am Mittwoch 21 November 2007 schrieb Felipe Balbi:
> > Do you know any good way for performing a softreset within the driver?
> > The video application should get a continuous datastream after
> > resuming the notebook, so the driver shouldn't be unloaded.
> > The driver also keeps a list of previous camera settings which should
> > be set up again after resuming. Stopping the video application and
> > reattaching the device using ACPI (this board supports reconnecting
> > the device using ACPI) should be avoided.
> 
> When you suspend, you cut off vbus (afaik, correct me if I'm wrong), which
> means your device will get disconnected. One way to avoid this is enabling
> CONFIG_USB_PERSIST and trying with that on.

Suspend may or may not cut off power. If it does cut off power, resume() will
never be called, instead either disconnect() or reset_resume().

	Regards
		Oliver

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