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=-4.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 22BEAC4338F for ; Wed, 28 Jul 2021 07:12:15 +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 E2B2C60F41 for ; Wed, 28 Jul 2021 07:12:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E2B2C60F41 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hD4eP3s3anLa7K80SZCzpccQcFu93mh1haKXkrL37fQ=; b=TubeaSvi9Tltxi J1e2upNEtcOlt7DeXi6rD6wQddGj45iip5/tTy6WCQDRQBaR0qU9Lu9vkFuL5oJ1MBqe9EdpLBcC7 09Y3aOkNt1hlBwjZ8NfVsf801+QkuWWLxxFAZ1sRXMepXh4oXchsSlaJBcbWbDZU+FFtfX6KSMwuv C3Q4REsnAO5rFM77UpJSdtPr9IQLQ0ICpSKu3cbS3fVN6Anhgd3i5EeAHTBpylu7wIyhQu07Cw5tn 9LQ1imtdW/yZq/5SRumhSpJNF7eiH0MS0ysCiLPp5TP+1n4PMYCSAFitlxf4rmp9yM1L0/b/I5dWL uP445XXxXwEVW2LMTxiw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m8dhf-00HKuB-6v; Wed, 28 Jul 2021 07:10:07 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m8dhb-00HKtn-Rs for linux-arm-kernel@lists.infradead.org; Wed, 28 Jul 2021 07:10:05 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6F6A860F01; Wed, 28 Jul 2021 07:10:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627456203; bh=spLJJp0kWz4iiYPQWcebOS6VyUZYt/YL7QyUP4C3ddM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=E0laffxtaI1HhSySNQxdxufyAYMnAPLjZQZV49FZYIXIvj3UbgqWcdon+/gFdqQ1d pX5PaZzNCUHW+LCm3rUShTuC03O61V6p6ipvirO1n/mZvCUwVfCLZEJTyQU8yWYFwx Dw+3czxSk9Q6v6chLBuzyOhVJoKTXsgBjYLGpG9M6l3AZNcxKuLoCWcLFR7jYNi8v1 C20765URrLmDb/mFtAlq6NbLYkEELeCG1ip8XyxAzd90AG7zKHJiDdhgLqGVVbksCc eF50NtP4Eb7iwcnEswfGKkctd1jM0Q56vSP8NNjWB2cd2ORu65yX7S0WaTzra02rg4 Ey9/++NCxMelA== Date: Wed, 28 Jul 2021 12:39:57 +0530 From: Vinod Koul To: Amelie Delaunay Cc: Rob Herring , Dan Williams , Maxime Coquelin , Alexandre Torgue , dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Pierre-Yves Mordret Subject: Re: [PATCH 0/2] STM32 DMA alternative REQ/ACK protocol support Message-ID: References: <20210624093959.142265-1-amelie.delaunay@foss.st.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210624093959.142265-1-amelie.delaunay@foss.st.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210728_001003_962031_A92158EA X-CRM114-Status: UNSURE ( 7.17 ) X-CRM114-Notice: Please train this message. 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 24-06-21, 11:39, Amelie Delaunay wrote: > 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. Applied, thanks -- ~Vinod _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel