From patchwork Wed Oct 4 15:50:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amelie Delaunay X-Patchwork-Id: 13408946 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 38459E7C4D8 for ; Wed, 4 Oct 2023 15:51:21 +0000 (UTC) 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=y6ViiMesDPEDdAybhTQuhsWy1D7yOV6SIwXXS++M+ak=; b=PCV08b0HBSp8Bx 6Rke8hBvHcsYKbS0TcvA2cqoD8u598IVv4jbz7ndtEIEKtQQdd3/GXnE259TFYM21s5Mak5AxX4Lf LMTkgKwlS9KOZv9MJUS+FWfois3/L3jAXDdktZgdQ/AYIewUcCHAkZpUp+Btfie6SGW83v0JSCE6J dktS4HVwv5yGX7af0B0c6lYoGMJpwkSvQcAUbnrbUJWCn63ns+xKWyGPXhViBkkMgv/Wc5O+anCto YEfapUbNV7m1n4Td3YasT7MNfugRCrwMTU3pQBWFfBJQsuUfogwQoOF914CEBPjbX/ODw0FmKV4Ez NhGvrfgpJ28L4fV98XGg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qo495-000PT9-2Z; Wed, 04 Oct 2023 15:50:43 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qo491-000PS1-0o for linux-arm-kernel@lists.infradead.org; Wed, 04 Oct 2023 15:50:41 +0000 Received: from pps.filterd (m0369458.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.22/8.17.1.22) with ESMTP id 394ABEsL026844; Wed, 4 Oct 2023 17:50:29 +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=lRZ6+TZ OKkUcJ4/oh5Hwp1GtRYeC8Duvo8t9N5cheIQ=; b=P4uF5FhLgV/f1VC0L/NGThz HeGNmrO6bY1DEm6xbv3+EuofO6XLYTFWeXGhD1KtCarTYV45eRRZhuVqmrxj4G+1 BeYuKQDO/hLspRUHPEq/x0gFioKPX0aSQPFRFbMYXnUvAsicTEw5mj61ItxyfUlv 9BXFyMKwRx3yrVTTimUO6xD6JPqw0i0A5q8Y5qIFSD+RhyimQKi+lgoFSGx01BEu U4AyJiQiVYWIXpajvfdoheCNl04XmEf+SE2tdFNETTjPZw7FZvkOJnQCMBf8dwHE jBNlB/V6KB3wmGKhohe6CBIqy8NhzaUp6hE48SPthMtj84ngC8HjagYN0fDtPig= = Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3tew80qfcd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 04 Oct 2023 17:50:29 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id DF481100053; Wed, 4 Oct 2023 17:50:28 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node3.st.com [10.75.129.71]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id D7CFC26028D; Wed, 4 Oct 2023 17:50:28 +0200 (CEST) Received: from localhost (10.252.26.61) by SHFDAG1NODE3.st.com (10.75.129.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Wed, 4 Oct 2023 17:50:28 +0200 From: Amelie Delaunay To: Vinod Koul , Maxime Coquelin , Alexandre Torgue , Amelie Delaunay CC: , , , , Subject: [PATCH 1/2] dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining Date: Wed, 4 Oct 2023 17:50:23 +0200 Message-ID: <20231004155024.2609531-1-amelie.delaunay@foss.st.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.252.26.61] X-ClientProxiedBy: EQNCAS1NODE4.st.com (10.75.129.82) To SHFDAG1NODE3.st.com (10.75.129.71) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-04_07,2023-10-02_01,2023-05-22_02 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231004_085039_913562_B3780FB8 X-CRM114-Status: GOOD ( 12.10 ) 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 Current Target (CT) have to be reset when starting an MDMA chaining use case, as Double Buffer mode is activated. It ensures the DMA will start processing the first memory target (pointed with SxM0AR). Fixes: 723795173ce1 ("dmaengine: stm32-dma: add support to trigger STM32 MDMA") Signed-off-by: Amelie Delaunay Cc: stable@vger.kernel.org --- drivers/dma/stm32-dma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 5c36811aa134..7427acc82259 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -1113,8 +1113,10 @@ static struct dma_async_tx_descriptor *stm32_dma_prep_slave_sg( chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL; /* Activate Double Buffer Mode if DMA triggers STM32 MDMA and more than 1 sg */ - if (chan->trig_mdma && sg_len > 1) + if (chan->trig_mdma && sg_len > 1) { chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM; + chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_CT; + } for_each_sg(sgl, sg, sg_len, i) { ret = stm32_dma_set_xfer_param(chan, direction, &buswidth,