linux-kernel - Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline management

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Date:	Thu, 25 Nov 2010 13:53:51 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	linux-media@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, lrg@...mlogic.co.uk,
	sakari.ailus@...well.research.nokia.com, lennart@...ttering.net
Subject: Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline
 management

On Thu, Nov 25, 2010 at 03:28:16AM +0100, Laurent Pinchart wrote:
> Link states must not be modified while streaming is in progress on a
> graph they belong or connect to. The entity locking API helps drivers
> enforcing that requirement.

This is not desirable for embedded audio - for example, it is very
common to wish to switch from headphone to speaker and back mid
playback, or to move between headset, speakerphone and handset modes on
a phone.  This is normally implemented by reconfiguring the output paths
at runtime without interrupting applications.
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