From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754077AbbAGQR6 (ORCPT ); Wed, 7 Jan 2015 11:17:58 -0500 Received: from smtp-out-020.synserver.de ([212.40.185.20]:1049 "EHLO smtp-out-017.synserver.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754057AbbAGQR4 (ORCPT ); Wed, 7 Jan 2015 11:17:56 -0500 X-SynServer-TrustedSrc: 1 X-SynServer-AuthUser: lars@metafoo.de X-SynServer-PPID: 5377 Message-ID: <54AD5C2F.1090501@metafoo.de> Date: Wed, 07 Jan 2015 17:17:51 +0100 From: Lars-Peter Clausen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.3.0 MIME-Version: 1.0 To: Arnd Bergmann CC: linux-kernel@vger.kernel.org, Ralf Baechle , dmaengine@vger.kernel.org, alsa-devel@alsa-project.org, linux-mmc@vger.kernel.org, linux-mips@linux-mips.org Subject: Re: [PATCH, RFC] MIPS: jz4740: use dma filter function References: <22569458.nE7JkNNnz3@wuerfel> <2633187.PyovTNc8DC@wuerfel> <54AD42D0.4070402@metafoo.de> <10623722.YrKe6DgiSS@wuerfel> In-Reply-To: <10623722.YrKe6DgiSS@wuerfel> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/07/2015 05:13 PM, Arnd Bergmann wrote: > On Wednesday 07 January 2015 15:29:36 Lars-Peter Clausen wrote: >> On 01/06/2015 02:48 PM, Arnd Bergmann wrote: >>> On Tuesday 06 January 2015 11:45:58 Lars-Peter Clausen wrote: >>>> On 01/05/2015 11:39 PM, Arnd Bergmann wrote: >>>>> As discussed on the topic of shmobile DMA today, jz4740 is the only >>>>> user of the slave_id field in dma_slave_config besides shmobile. This >>>>> use is really incompatible with the way that other drivers use the >>>>> dmaengine API, so we should get rid of it. >>>> >>>> Do you have a link to that discussion? >>> >>> http://www.spinics.net/lists/linux-mmc/msg30069.html >> >> I'm really not comfortable with this patch, since it is a step back. But I >> guess the end justify the means. So if it helps to get rid of slave_id I'm >> ok with it, sooner or later jz4740 will be converted to DT so once that's >> done the filter function can be removed again. But please put the filter >> function in a non arch specific header so we can still compile test things. >> And maybe note in the commit message that this is meant as a temporary hack. >> > > Do you have a timeline for DT support? Maybe it's easier to just > wait for the problem to solve itself. 2 to 3 upstream releases. I have the code and it is working, but the migration path has a lot of inter dependencies between different frameworks, so it is going to take a while until all is upstream. - Lars From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: Re: [PATCH, RFC] MIPS: jz4740: use dma filter function Date: Wed, 07 Jan 2015 17:17:51 +0100 Message-ID: <54AD5C2F.1090501@metafoo.de> References: <22569458.nE7JkNNnz3@wuerfel> <2633187.PyovTNc8DC@wuerfel> <54AD42D0.4070402@metafoo.de> <10623722.YrKe6DgiSS@wuerfel> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <10623722.YrKe6DgiSS@wuerfel> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Arnd Bergmann Cc: linux-mips@linux-mips.org, alsa-devel@alsa-project.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Ralf Baechle , dmaengine@vger.kernel.org List-Id: linux-mmc@vger.kernel.org On 01/07/2015 05:13 PM, Arnd Bergmann wrote: > On Wednesday 07 January 2015 15:29:36 Lars-Peter Clausen wrote: >> On 01/06/2015 02:48 PM, Arnd Bergmann wrote: >>> On Tuesday 06 January 2015 11:45:58 Lars-Peter Clausen wrote: >>>> On 01/05/2015 11:39 PM, Arnd Bergmann wrote: >>>>> As discussed on the topic of shmobile DMA today, jz4740 is the only >>>>> user of the slave_id field in dma_slave_config besides shmobile. This >>>>> use is really incompatible with the way that other drivers use the >>>>> dmaengine API, so we should get rid of it. >>>> >>>> Do you have a link to that discussion? >>> >>> http://www.spinics.net/lists/linux-mmc/msg30069.html >> >> I'm really not comfortable with this patch, since it is a step back. But I >> guess the end justify the means. So if it helps to get rid of slave_id I'm >> ok with it, sooner or later jz4740 will be converted to DT so once that's >> done the filter function can be removed again. But please put the filter >> function in a non arch specific header so we can still compile test things. >> And maybe note in the commit message that this is meant as a temporary hack. >> > > Do you have a timeline for DT support? Maybe it's easier to just > wait for the problem to solve itself. 2 to 3 upstream releases. I have the code and it is working, but the migration path has a lot of inter dependencies between different frameworks, so it is going to take a while until all is upstream. - Lars