From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96FCEC47409 for ; Wed, 29 Jan 2020 15:37:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B902214DB for ; Wed, 29 Jan 2020 15:37:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="DDpHNdKJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727035AbgA2PhJ (ORCPT ); Wed, 29 Jan 2020 10:37:09 -0500 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:48539 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726842AbgA2Pg4 (ORCPT ); Wed, 29 Jan 2020 10:36:56 -0500 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00TFNBY8019444; Wed, 29 Jan 2020 16:36:37 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=AftG5z+N17+/aKK5rA8xT7aJNL2Vyvyl7T7R+UeirkA=; b=DDpHNdKJ02FAGVPens/IbVD4G5USzy1RxDXJLEQ55d/zr6gldzhDUX3PizE9xvyUlzJw cWDF+fjHZXHq8SDKPlB4jiJ4uhuCebTVzh681T3oun0q+JTqtUPZgaGGErk411egmX1C 9pjOE96zV/gX6o1nLLzF+eMh7jvySoqOmADVbChz4I3IxpeqKzaCMwkTYQddjU65cW5E BrZp7Qa4BYjDfUgaalLPMp2yv8IBvVuT2hCmOLvDYCw5F1iRNXmMwRj+T9PER5XJoUTq FZvav89dlKtRxFpoP3JiWgjcCqP8RJtcLznnwpmf8k3ZrXXXq+3Nhc+68Wx9flQ480Y5 /A== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2xrcay3vb4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 29 Jan 2020 16:36:37 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 1DF04100034; Wed, 29 Jan 2020 16:36:37 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 10CD72BC7C2; Wed, 29 Jan 2020 16:36:37 +0100 (CET) Received: from localhost (10.75.127.46) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 29 Jan 2020 16:36:36 +0100 From: Amelie Delaunay To: Vinod Koul , Dan Williams , Maxime Coquelin , Alexandre Torgue CC: , , , , Amelie Delaunay , Pierre-Yves MORDRET Subject: [PATCH 4/8] dmaengine: stm32-dma: enable descriptor_reuse Date: Wed, 29 Jan 2020 16:36:24 +0100 Message-ID: <20200129153628.29329-5-amelie.delaunay@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200129153628.29329-1-amelie.delaunay@st.com> References: <20200129153628.29329-1-amelie.delaunay@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG2NODE2.st.com (10.75.127.5) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-29_03:2020-01-28,2020-01-29 signatures=0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Pierre-Yves MORDRET Enable client to resubmit already processed descriptors in order to save descriptor creation time. Signed-off-by: Pierre-Yves MORDRET Signed-off-by: Amelie Delaunay --- drivers/dma/stm32-dma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index c8bbe08b8e32..25f7281932bd 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -554,6 +554,7 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan) sg_req = &chan->desc->sg_req[chan->next_sg]; reg = &sg_req->chan_reg; + reg->dma_scr &= ~STM32_DMA_SCR_EN; stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr); stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar); stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar); @@ -1343,6 +1344,7 @@ static int stm32_dma_probe(struct platform_device *pdev) dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; dd->max_burst = STM32_DMA_MAX_BURST; + dd->descriptor_reuse = true; dd->dev = &pdev->dev; INIT_LIST_HEAD(&dd->channels); -- 2.17.1