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: 12341653 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=-12.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,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 69BA9C48BDF for ; Thu, 24 Jun 2021 09:42:04 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 36AB1613F7 for ; Thu, 24 Jun 2021 09:42:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 36AB1613F7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=foss.st.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=FFslx9BC91Wi+BssVgX4oJiDJqM6/TFWmfw3clNLh6M=; b=GTjJp6uss7OSTO 6jT7VaN/0QpwnFMYAsT4dH6YVpYERZegf14vQVkEd5oV7+s5jEBM9ohSUMa1SMMuUZcDQQMKljI8e WiR9nJcn7NdgLBsI9xNEeQyjsT6GU3IYHMcm12pNQgLiS8vTkK85HgoIhUO5vKywBq4d34crtEIc6 GzUil0PgP0UMQzDszSz4elKiSd4ux2FjUDWSbk62e4QMAPJnnxIoq9zTNhQFgu9wptwBRZh8+XZTt ugVp1zBx32SRjfBx43LUANXLRMzLFdJ/KSehKje/Tuort6N5zD4jbtNfkryQBmBLeJO4mj6Ow6tRo SektHEd1Uzy17QOza3Dw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lwLqR-00DkR4-NF; Thu, 24 Jun 2021 09:40:23 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lwLqL-00DkOy-32 for linux-arm-kernel@lists.infradead.org; Thu, 24 Jun 2021 09:40:18 +0000 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210624_024017_627717_64C6C895 X-CRM114-Status: GOOD ( 12.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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(-)