From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756064AbdABN4p (ORCPT ); Mon, 2 Jan 2017 08:56:45 -0500 Received: from smtprelay.synopsys.com ([198.182.47.9]:60823 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755547AbdABN4n (ORCPT ); Mon, 2 Jan 2017 08:56:43 -0500 Subject: Re: dmaengine: dw-dmac: Custom cyclic API (Why?) To: Andy Shevchenko , Vinod Koul References: <99eeb12c-fd4f-7982-4832-61116fd641d3@synopsys.com> <1483346280.9552.181.camel@linux.intel.com> <20170102101802.GX3573@localhost> <1483356603.9552.197.camel@linux.intel.com> CC: Jose Abreu , "dmaengine@vger.kernel.org" , "linux-kernel@vger.kernel.org" , From: Jose Abreu Message-ID: <391eddb5-6ff5-6ae2-f224-ba9f00e19f69@synopsys.com> Date: Mon, 2 Jan 2017 13:56:38 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <1483356603.9552.197.camel@linux.intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.107.19.88] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 02-01-2017 11:30, Andy Shevchenko wrote: > On Mon, 2017-01-02 at 15:48 +0530, Vinod Koul wrote: >> On Mon, Jan 02, 2017 at 10:38:00AM +0200, Andy Shevchenko wrote: >>> On Fri, 2016-12-30 at 12:05 +0000, Jose Abreu wrote: >>>> ++dw-dmac Maintainers >>> I used to have some semi-finished patch to switch to generic API, >>> though >>> at that point I had no means to test it. >>> >>> Since I eventually got iDMA 32-bit, which is used as LPE Audio DMA >>> engine, support in my branch I might test it in the future, though I >>> think someone else would be much faster than me. >> no we can't, since the DSP is involved and takes control, so unless we >> do >> lots of nasty hacks, it won't be testable. I don't see the ROI for >> such an >> effort. > Thanks for clarification > >> btw, feel free to test and send patches if you have such a h/w > Actually we have AVR32 connected to our lab. So, I can test it there, > but I rather need a patch to use some dummy stub instead of codec (it > has no codec connected). > Thank you all for the info. I don't have the HW ready to test yet (I was collecting some info first), but when I do I can test on my side using Designware I2S and ALSA SoC DMA engine. Best regards, Jose Miguel Abreu