From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [4/5] dmaengine: sprd: Add Spreadtrum DMA configuration From: Vinod Koul Message-Id: <20180416153501.GQ6014@localhost> Date: Mon, 16 Apr 2018 21:05:01 +0530 To: Baolin Wang Cc: Dan Williams , Eric Long , Mark Brown , dmaengine@vger.kernel.org, LKML List-ID: T24gTW9uLCBBcHIgMTYsIDIwMTggYXQgMDI6MzI6MDVQTSArMDgwMCwgQmFvbGluIFdhbmcgd3Jv dGU6Cgo+ID4+IEJlc2lkZSB0aGUgZ2VuZXJhbCBjb25maWd1cmF0aW9uLCBvdXIgYXVkaW8gZHJp dmVyIHdpbGwgY29uZmlndXJlIHRoZQo+ID4+IGZyYWdtZW50IGxlbmd0aCwgYmxvY2sgbGVuZ3Ro LCBtYXliZSB0cmFuc2FjdGlvbiBsZW5ndGgsIGFuZCB0aGV5IG11c3QKPiA+PiBzcGVjaWZ5IHRo ZSByZXF1ZXN0IHR5cGUgYW5kIGludGVycnVwdCB0eXBlLCB0aGVzZSBhcmUgd2hhdCB3ZSB3YW50 IHRvCj4gPj4gZXhwb3J0IGZvciB1c2Vycy4KPiA+Cj4gPiBBcyBJIHNhaWQgYmVmb3JlLCB5b3Ug bmVlZCB0byBkZXJpdmUgZnJhZ21lbnQsIGJsb2NrIG9yIHRyYW5zYWN0aW9uIGZyb20KPiAKPiBJ IGFtIHNvcnJ5IEkgZGlkIG5vdCBtYWtlIHRoaW5ncyBjbGVhciBoZXJlLiBXaGF0IEkgbWVhbiBp cyBub3Qgb25seQo+IGxpbmsgbGlzdCBtb2RlKHByZXBfY3ljbGljKSwgYnV0IGFsc28gb3RoZXIg bW9kZXMgKHByZXBfc2xhdmUsCj4gcHJlcF9pbnRlcmxlYXZlZCAuLi4pLCB1c2VycyBzdGlsbCBu ZWVkIHRvIGNvbmZpZ3VyZSB0aGUgZnJhZ21lbnQKPiBsZW5ndGgsIGJsb2NrIGxlbmd0aCBvciB0 cmFuc2FjdGlvbiBsZW5ndGggYWNjb3JkaW5nIHRvIHRoZWlyCj4gcmVxdWlyZW1lbnRzLgoKT3Ro ZXIgbW9kZXMgYXJlIHNpbWlsYXIsIHRoZXkgYWxzbyB1c2UgdGhlIHBhcmFtZXRlcnMgcHJvZ3Jh bW1lZCBmcm9tCmRtYV9zbGF2ZV9jb25maWcuIFBscyBzZWUgb3RoZXIgZHJpdmVyIGV4YW1wbGVz LiBJSVJDIGR3IGRtYSBoYXMKc2ltaWxhciBjYXBhYmlsaXRpZXMgYnV0IG5vdCBhbGwgYXJlIGV4 cG9zZWQgdG8gdXNlciBhbmQgZHJpdmVyIGNvbmZpZ3VyZXMuCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753160AbeDPPad (ORCPT ); Mon, 16 Apr 2018 11:30:33 -0400 Received: from mga02.intel.com ([134.134.136.20]:40717 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752914AbeDPPab (ORCPT ); Mon, 16 Apr 2018 11:30:31 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,459,1517904000"; d="scan'208";a="32380115" Date: Mon, 16 Apr 2018 21:05:01 +0530 From: Vinod Koul To: Baolin Wang Cc: Dan Williams , Eric Long , Mark Brown , dmaengine@vger.kernel.org, LKML Subject: Re: [PATCH 4/5] dmaengine: sprd: Add Spreadtrum DMA configuration Message-ID: <20180416153501.GQ6014@localhost> References: <20180412093735.GF6014@localhost> <20180413034332.GI6014@localhost> <20180413063641.GL6014@localhost> <20180416035831.GO6014@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 16, 2018 at 02:32:05PM +0800, Baolin Wang wrote: > >> Beside the general configuration, our audio driver will configure the > >> fragment length, block length, maybe transaction length, and they must > >> specify the request type and interrupt type, these are what we want to > >> export for users. > > > > As I said before, you need to derive fragment, block or transaction from > > I am sorry I did not make things clear here. What I mean is not only > link list mode(prep_cyclic), but also other modes (prep_slave, > prep_interleaved ...), users still need to configure the fragment > length, block length or transaction length according to their > requirements. Other modes are similar, they also use the parameters programmed from dma_slave_config. Pls see other driver examples. IIRC dw dma has similar capabilities but not all are exposed to user and driver configures. -- ~Vinod