linux-kernel - Re: [PATCH 1/2] Bluetooth: Add reset

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Date:	Tue, 02 Jun 2015 09:47:50 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Laura Abbott <labbott@...oraproject.org>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Ming Lei <ming.lei@...onical.com>,
	"David S. Miller" <davem@...emloft.net>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Takashi Iwai <tiwai@...e.de>, linux-bluetooth@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/2] Bluetooth: Add reset_resume function

On Mon, 2015-06-01 at 18:14 -0700, Laura Abbott wrote:
> Bluetooth devices off of some buses such as USB may lose power across
> suspend/resume. When this happens, drivers may need to have the setup
> function called again and behave differently than a cold power on.

Yes, but what is the point? We use reset_resume() to retain
some features of a device across a loss of power.
If power is lost, all settings are gone and all connections
are broken. So what is the difference compared to a plug out/in
cycle?

	Regards
		Oliver



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