From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [RFC/PATCH v6 09/12] media: Entity locking and pipeline management Date: Thu, 25 Nov 2010 13:53:51 +0000 Message-ID: <20101125135351.GD24208@opensource.wolfsonmicro.com> References: <1290652099-15102-1-git-send-email-laurent.pinchart@ideasonboard.com> <1290652099-15102-10-git-send-email-laurent.pinchart@ideasonboard.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from opensource.wolfsonmicro.com ([80.75.67.52]:49844 "EHLO opensource2.wolfsonmicro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752172Ab0KYNxm (ORCPT ); Thu, 25 Nov 2010 08:53:42 -0500 Content-Disposition: inline In-Reply-To: <1290652099-15102-10-git-send-email-laurent.pinchart@ideasonboard.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Laurent Pinchart 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 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.