From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932404AbZDANxu (ORCPT ); Wed, 1 Apr 2009 09:53:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932286AbZDANwO (ORCPT ); Wed, 1 Apr 2009 09:52:14 -0400 Received: from relay.atmel.no ([80.232.32.139]:52953 "EHLO relay.atmel.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932307AbZDANwM (ORCPT ); Wed, 1 Apr 2009 09:52:12 -0400 Date: Wed, 1 Apr 2009 15:52:05 +0200 From: Haavard Skinnemoen To: Hans-Christian Egtvedt Cc: linux-kernel@vger.kernel.org, dan.j.williams@intel.com, maciej.sosnowski@intel.com, Hans-Christian Egtvedt Subject: Re: [PATCH v3 1/1] dw_dmac: add cyclic API to DW DMA driver Message-ID: <20090401155205.1f47ccc4@hskinnemoen-d830> In-Reply-To: <1238593622-17809-1-git-send-email-hans-christian.egtvedt@atmel.com> References: <20090401153957.6982f050@hskinnemoen-d830> <1238593622-17809-1-git-send-email-hans-christian.egtvedt@atmel.com> X-Mailer: Claws Mail 3.6.1 (GTK+ 2.16.0; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hans-Christian Egtvedt wrote: > This patch adds a cyclic DMA interface to the DW DMA driver. This is > very useful if you want to use the DMA controller in combination with a > sound device which uses cyclic buffers. > > Using a DMA channel for cyclic DMA will disable the possibility to use > it as a normal DMA engine until the user calls the cyclic free function > on the DMA channel. Also a cyclic DMA list can not be prepared if the > channel is already active. > > Signed-off-by: Hans-Christian Egtvedt Acked-by: Haavard Skinnemoen