Received: by 2002:a05:6a10:f3d0:0:0:0:0 with SMTP id a16csp56088pxv; Thu, 24 Jun 2021 02:41:22 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzVmSDQ6haRSa0/6/Y8HhBG1IHKYfK8J4m3R6vI365zHBhy02B826K30DHi7mA3Yb3yYJm8 X-Received: by 2002:a5d:8752:: with SMTP id k18mr3341289iol.139.1624527682079; Thu, 24 Jun 2021 02:41:22 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1624527682; cv=none; d=google.com; s=arc-20160816; b=nCBH/ceWywt8w4Hn2rgFzAad7rW1s/RjD7js+S2QKBd2834eROqYvXnZ5umReoCjZI 70R0dPk0JjCbB8x7oPiCPnJ6dNRoK5rMmcx3suLIOShKGCMr8uILBwpP2CsfumfOP05s mshqvn68zvlgUkI4IJeU4aqYZdoaf4Ofj5B2dfhI5jRQ4IBkndVEXsIEPo9PgsN3FuEG 8/Fe9c3lx1el9Lh1BEuC/4K2l95OxOw1WH5yIMMmdul/K2hG/lbVl0Rd87W+Ekp/gDIB 9LDwT8Zif+UJu2740WhjtdPHi3koE728YD3v1atCTM/e1H499qsJ5y0jf9zRVYpIbsmK khmQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from:dkim-signature; bh=WH9sfPG0sFNA7LnkNWxq7q/+Vqhs13duVaMd5M0INYY=; b=ZlWk686xzTSxrGNYBwGKYUREuPXfVUOiHL0FowHqd6/wbaUQBBEzI1lQE7U+1CpbbQ FMbGAC0qveQtpzW2NPzKZLnDj0GvgwsvLYxQRYwTiAd+kq2Yt/EBRZC5uRDHzNHc42Li uV1E8r1ifeJZTuOSfrrIbDK2AjsfjYrc5ktylr0QgBenUqBIxbAh9LIsJShmIND9VeIK IzI0qMiirCPiKXXawC6L5y8WSB/O5fVxLOJ+k+Mb8mqn9uMW2Tzh7A2VrU266Nn4WNlc JY+TRDtWQ2gRqFfcg4XYf9tgnThGRuYf4MkdM9JIhAjU9ruRWL2sLib3oTDRmLwwV+M3 Xvyg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@foss.st.com header.s=selector1 header.b=Hg3ALsol; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=foss.st.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id w132si2873661jab.61.2021.06.24.02.41.09; Thu, 24 Jun 2021 02:41:22 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@foss.st.com header.s=selector1 header.b=Hg3ALsol; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=foss.st.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232019AbhFXJmm (ORCPT + 99 others); Thu, 24 Jun 2021 05:42:42 -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 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: linux-kernel@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(-) -- 2.25.1