From patchwork Thu Jun 24 09:39:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amelie Delaunay X-Patchwork-Id: 12341663 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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 BD5C2C49EA5 for ; Thu, 24 Jun 2021 09:40:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A36A1613F8 for ; Thu, 24 Jun 2021 09:40:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232013AbhFXJmk (ORCPT ); Thu, 24 Jun 2021 05:42:40 -0400 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:44728 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231761AbhFXJmj (ORCPT ); Thu, 24 Jun 2021 05:42:39 -0400 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 15O9bWII017277; Thu, 24 Jun 2021 11:40:04 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=selector1; bh=WH9sfPG0sFNA7LnkNWxq7q/+Vqhs13duVaMd5M0INYY=; b=Hg3ALsols4wy7O2HRn45cNFK+aUozudy/C4XBAz6QG321NCgkr2CHAW8ANqUFYlu2UwR MDC6+oflaB10l41ia56nZ+AE65Qgz+ANGcCtx6Cn5I8jinupBgrUTtLeV3Tfcd4/HidI LszdQjJSGdLaJVP87Ip4U1oJvGUmrXUNhxEmhU/pc8WVjx/GNm7InL+BVh7aC13zQ6+K ZLM2TbKCkJTiR5Ps9fKrh44rtXjPyh1RCXF5hXcig68/7mcEmS3fLjeDkezyUZ5c8VCx MokpZHQQqHp9ERQhZjDtWMJiXhopjNZfc+Lk6YsK8ve1WgM1ds1CHrP6agK0nzWaRd3U 1A== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 39cp5us8mp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 24 Jun 2021 11:40:04 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C0B49100034; Thu, 24 Jun 2021 11:40:02 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id A759721B518; Thu, 24 Jun 2021 11:40:02 +0200 (CEST) Received: from localhost (10.75.127.46) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 24 Jun 2021 11:40:01 +0200 From: Amelie Delaunay To: Vinod Koul , Rob Herring , Dan Williams , Maxime Coquelin , Alexandre Torgue CC: , , , , , Amelie Delaunay , Pierre-Yves Mordret Subject: [PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support Date: Thu, 24 Jun 2021 11:39:57 +0200 Message-ID: <20210624093959.142265-1-amelie.delaunay@foss.st.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG2NODE2.st.com (10.75.127.5) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-06-24_06:2021-06-24,2021-06-24 signatures=0 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org Default REQ/ACK protocol consists in maintaining ACK signal up to the removal of REQuest and the transfer completion. In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the removal of the REQuest, but only the transfer completion. Due to a possible DMA stream lock when transferring data to/from STM32 USART/UART, add support to select alternative REQ/ACK protocol. Amelie Delaunay (2): dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma dmaengine: stm32-dma: add alternate REQ/ACK protocol management Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++ drivers/dma/stm32-dma.c | 8 ++++++-- 2 files changed, 13 insertions(+), 2 deletions(-)