From patchwork Tue Jul 19 15:31:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amelie Delaunay X-Patchwork-Id: 12922688 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 7F71FC43334 for ; Tue, 19 Jul 2022 15:33:36 +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=SSAvFaXS6X/yAI41nlVzXdI77cqnLWvWkHpEja7QGs0=; b=rn/JlOKCeiaUCJ 8Ri2oI0rFe6x2P/pd4ZDVddoBw1x1jTpuulm61gAa6Yf9UlcgpQBJxGMmlxaljUASDH2niotVTmyj jdnylu8wfMUMyjsvseKNeuGiFx8VY77WrmgZZJfaULbAoEGWpEV1M7Rk8gvyIadRgB1HpziyYZoDV XY0hFBnHEt/oQ2Yt2v4oUqtP8icoRJJjb87ggsLEIRCrq0NnGiJtm7s2Gd7qqMsRcGF62oBHkohV6 egxOnhEQ3cMpgCZXobP/Kwtk6WR4lPGhdFTap5Z1B6AhHupCwLLbLDVOrE035dxODc0JJyKHPMw3Z 6g14ndzU7K4e/G+chNmA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oDpD2-00A5Xq-6F; Tue, 19 Jul 2022 15:32:28 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93] helo=mx07-00178001.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oDpCE-00A55M-QB for linux-arm-kernel@lists.infradead.org; Tue, 19 Jul 2022 15:31:40 +0000 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 26JD8AR7030475; Tue, 19 Jul 2022 17:31:26 +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=1ralePF7NZgiuaaEZtba9R7/B4WF8Zv4f9q+QOtg1so=; b=ovGLk68qwlCYzXBtDnHzdBiVd7/Agced4hab8SCCtj6Q2qS3vg2skCuapG+9vWhaXcw+ wCgLgNAQsqMJJN1uOuiwF1smm59WOeRSbI1wl3um/QUEFSeAhzqVGzK0YWdmUOyNTFkc Ka1PUJqGEGmsPXn1YLUPCvbXAOuRe30vXl2PlYrQpjdbA7jyGjQ6VOEVACI8Tf0OSOUV +pkTQS1qpenJFg9/Y0gcFAG1oGgXhB5eibtNEoOqepyu596lqTqk2y1VuSwep3lNpPFh rkcPqeJ0p4lzAL+L99UKTSKLdxBTGTphF4TMnVyTzU1MCcwktEjMkJAubfAhvUryWb8A xQ== 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 3hdrwwjf19-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 19 Jul 2022 17:31:26 +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 CFD6A10002A; Tue, 19 Jul 2022 17:31:25 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id CAE7B22AFE6; Tue, 19 Jul 2022 17:31:25 +0200 (CEST) Received: from localhost (10.75.127.44) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.20; Tue, 19 Jul 2022 17:31:24 +0200 From: Amelie Delaunay To: Jonathan Corbet , Vinod Koul , Maxime Coquelin , Alexandre Torgue CC: , , , , , Marek Vasut , Amelie Delaunay Subject: [PATCH v3 0/6] STM32 DMA-MDMA chaining feature Date: Tue, 19 Jul 2022 17:31:16 +0200 Message-ID: <20220719153122.620730-1-amelie.delaunay@foss.st.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG2NODE3.st.com (10.75.127.6) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-19_04,2022-07-19_01,2022-06-22_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220719_083139_211498_0617AC27 X-CRM114-Status: GOOD ( 16.89 ) 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 This patchset (re)introduces STM32 DMA-MDMA chaining feature. As the DMA is not able to generate convenient burst transfer on the DDR, it penalises the AXI bus when accessing the DDR. While it accesses optimally the SRAM. The DMA-MDMA chaining then consists in having an SRAM buffer between DMA and MDMA, so the DMA deals with peripheral and SRAM, and the MDMA with SRAM and DDR. The feature relies on the fact that DMA channel Transfer Complete signal can trigger a MDMA channel transfer and MDMA can clear the DMA request by writing to DMA Interrupt Clear register. A deeper introduction can be found in patch 1. Previous implementation [1] has been dropped as nacked. Unlike this previous implementation (where all the stuff was embedded in stm32-dma driver), the user (in peripheral drivers using dma) has now to configure the MDMA channel. [1] https://lore.kernel.org/lkml/1538139715-24406-1-git-send-email-pierre-yves.mordret@st.com/ Changes in v3: - introduce two prior patches to help readibility - fix stm32-dma struct stm32_dma_mdma_config documentation Changes in v2: - wrap to 80-column limit for documentation - add an entry for this documentation in index.rst - use simple table instead of csv-table in documentation Amelie Delaunay (6): dmaengine: stm32-dma: introduce 3 helpers to address channel flags dmaengine: stm32-dma: use bitfield helpers docs: arm: stm32: introduce STM32 DMA-MDMA chaining feature dmaengine: stm32-dmamux: set dmamux channel id in dma features bitfield dmaengine: stm32-dma: add support to trigger STM32 MDMA dmaengine: stm32-mdma: add support to be triggered by STM32 DMA Documentation/arm/index.rst | 1 + .../arm/stm32/stm32-dma-mdma-chaining.rst | 415 ++++++++++++++++++ drivers/dma/stm32-dma.c | 136 +++--- drivers/dma/stm32-dmamux.c | 2 +- drivers/dma/stm32-mdma.c | 70 ++- 5 files changed, 569 insertions(+), 55 deletions(-) create mode 100644 Documentation/arm/stm32/stm32-dma-mdma-chaining.rst