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[23.128.96.18]) by mx.google.com with ESMTP id z15si16406405ilh.22.2021.07.21.04.53.46; Wed, 21 Jul 2021 04:53:57 -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=mfjgMnmH; 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 S236964AbhGULLQ (ORCPT + 99 others); Wed, 21 Jul 2021 07:11:16 -0400 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:34138 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238499AbhGUK7l (ORCPT ); Wed, 21 Jul 2021 06:59:41 -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 16LBdKru028532; Wed, 21 Jul 2021 13:40:00 +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=mfjgMnmHu2oLf9JSYyCjk//ibLydGvJN0Ht8JXZXs7OTV/cGGZ3JTAERUwkBvjfPBOUc 3xm1LLXcsGUghlim1TlvmWvaT9KXKfj8RZDOUsR6htHIVkWIa0D0d7Sq4GeuUvvu3cwl 8mmsRa7sl1zaWJHZ98gIpmWh94Kp0Zle+Tk0QR0N2ThSzB8r9AB2WgmFmUr75ypNFD1R prNGL6dqSKUaDxocFqT0d+kfh64oN7ur8LMWhU8bwa9EbM4rp/S2djSn+R5OQLVH2S9A QQyfuWiaSSRd9EVd3H/IS057DNW/dondUrayo2BzYxRBytWRAXA2aMVGXi+cJL9ZNS8v 5A== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 39wvs0pre5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 21 Jul 2021 13:40:00 +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 2A09B10002A; Wed, 21 Jul 2021 13:39:58 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 137852238C2; Wed, 21 Jul 2021 13:39:58 +0200 (CEST) Received: from localhost (10.75.127.50) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 21 Jul 2021 13:39:57 +0200 From: Amelie Delaunay To: Vinod Koul , Rob Herring , Dan Williams , Maxime Coquelin , Alexandre Torgue CC: , , , , , Amelie Delaunay , Pierre-Yves Mordret Subject: [RESEND PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support Date: Wed, 21 Jul 2021 13:39:44 +0200 Message-ID: <20210721113946.81001-1-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: [10.75.127.50] X-ClientProxiedBy: SFHDAG2NODE1.st.com (10.75.127.4) 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=2021-07-21_08:2021-07-21,2021-07-21 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