From patchwork Thu Oct 16 10:17:05 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 5090851 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id BD6CB9F2BA for ; Thu, 16 Oct 2014 10:34:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id F0468201C7 for ; Thu, 16 Oct 2014 10:34:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 28D9120166 for ; Thu, 16 Oct 2014 10:34:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752844AbaJPKen (ORCPT ); Thu, 16 Oct 2014 06:34:43 -0400 Received: from top.free-electrons.com ([176.31.233.9]:37200 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752331AbaJPKTr (ORCPT ); Thu, 16 Oct 2014 06:19:47 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id 75C582EFE; Thu, 16 Oct 2014 12:19:45 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_WEB, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost (unknown [62.156.150.204]) by mail.free-electrons.com (Postfix) with ESMTPSA id E5907333B; Thu, 16 Oct 2014 12:18:23 +0200 (CEST) From: Maxime Ripard To: dmaengine@vger.kernel.org, Vinod Koul Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Laurent Pinchart , =?UTF-8?q?Antoine=20T=C3=A9nart?= , lars@metafoo.de, Russell King , Maxime Ripard , Dan Williams Subject: [PATCH v2 06/53] dmaengine: Create a generic dma_slave_caps callback Date: Thu, 16 Oct 2014 12:17:05 +0200 Message-Id: <1413454672-27400-7-git-send-email-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1413454672-27400-1-git-send-email-maxime.ripard@free-electrons.com> References: <1413454672-27400-1-git-send-email-maxime.ripard@free-electrons.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP dma_slave_caps is very important to the generic layers that might interact with dmaengine, such as ASoC. Unfortunately, it has been added as yet another dma_device callback, and most of the existing drivers haven't implemented it, reducing its reliability. Introduce a generic behaviour and a flag to trigger it. In case this flag hasn't been set, fall back to the old mechanism. Signed-off-by: Maxime Ripard --- include/linux/dmaengine.h | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 4d0294ec3567..85afd71df2e7 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -643,6 +643,8 @@ struct dma_device { int dev_id; struct device *dev; + bool generic_slave_caps; + int (*device_alloc_chan_resources)(struct dma_chan *chan); void (*device_free_chan_resources)(struct dma_chan *chan); @@ -772,17 +774,32 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma( static inline int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps) { + struct dma_device *device; + if (!chan || !caps) return -EINVAL; + device = chan->device; + /* check if the channel supports slave transactions */ - if (!test_bit(DMA_SLAVE, chan->device->cap_mask.bits)) + if (!test_bit(DMA_SLAVE, device->cap_mask.bits)) + return -ENXIO; + + if (device->device_slave_caps) + return device->device_slave_caps(chan, caps); + + /* + * Check whether it reports it uses the generic slave + * capabilities, if not, that means it doesn't support any + * kind of slave capabilities reporting. + */ + if (device->generic_slave_caps) return -ENXIO; - if (chan->device->device_slave_caps) - return chan->device->device_slave_caps(chan, caps); + caps->cmd_pause = !!device->device_pause; + caps->cmd_terminate = !!device->device_terminate_all; - return -ENXIO; + return 0; } static inline int dmaengine_terminate_all(struct dma_chan *chan)