Date: Thu, 25 Nov 2010 13:53:51 +0000
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linux-media@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-kernel@vger.kernel.org, lrg@slimlogic.co.uk,
        sakari.ailus@maxwell.research.nokia.com, lennart@poettering.net
Subject: Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline
 management
Message-ID: <20101125135351.GD24208@opensource.wolfsonmicro.com>
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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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