From patchwork Tue May 7 12:54:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amelie Delaunay X-Patchwork-Id: 13656839 Received: from mx07-00178001.pphosted.com (mx07-00178001.pphosted.com [185.132.182.106]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A2B915E1E8; Tue, 7 May 2024 12:57:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.132.182.106 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715086636; cv=none; b=iQLSHYYREGCgL5ZQ0WeX5xc+GroJ6NfVnNjUMCD9TfoI81kHety4yRd8MRzNicqTAZBQoI4I4CyqC996I2GcAklbZgXjsxKYiTblprbxRN1vI52UqPlcwurUWkMjitmHNbqALxhozc6HPfkJaftZzpl3VwMclCfF9KzAD2hnizw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715086636; c=relaxed/simple; bh=kykdTLD6GyuwR1lrBR7FvBVi1Ca7wkXL8Cxo8Mx0p+c=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=T1+dAVqcFUoznHVCoXtGLe+mYgSnREKCkC2JwVa6LOO6xjO2RECFilQ5aKI+f4Zb6rLybPg/0VRgjmnMticb0lJiBnDDYluMgKJCLlCCvjL5eU5e/phxXR93EPxVeWtzI1LmIkkIIoQ4YVrAamqt4bmk7lgmMpzRe0qUAZtSobk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com; spf=pass smtp.mailfrom=foss.st.com; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b=xPMayQSH; arc=none smtp.client-ip=185.132.182.106 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=foss.st.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b="xPMayQSH" Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 447Ag3IP009953; Tue, 7 May 2024 14:57:01 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= selector1; bh=DJhhNPqjD+GWnDokMHmSRxmvL0BhYrxXJRadIzTOPx8=; b=xP MayQSHaIu2V3MSTaaiP8LiXiBdbvDVlI+EAnglqORe57YbKrPMJCXr/KgA/LI1Gd fF73JZf72SH1gqw5r9O88R0phW/Y1zA2m1xElbKd0gmbWYJT5zRNlZP+yj6ro4ck HKMhBLaPfVQzUB44WZbwXJoHZFkirceMAlkRqaKmHdmfW8qdFlU3iuUqElGVUQHz RhXpe4kg2/nppBmB/SKZwAQfb7OUEZN4T+lgbwTqCyVkEBiFg5QxwdgrpPyGjB9t NHxRSEkwhRmecFvVRXPDXt4H4ZeIEUpQSxLoOa7nPP3p6eg1d6VD6CRCcNnDTk6W AhFZgABVjnRKtL/T5zmA== Received: from beta.dmz-ap.st.com (beta.dmz-ap.st.com [138.198.100.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3xwcbxbsh8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 May 2024 14:57:01 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 5E00140047; Tue, 7 May 2024 14:56:57 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node3.st.com [10.75.129.71]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id E37A4216ECE; Tue, 7 May 2024 14:56:07 +0200 (CEST) Received: from localhost (10.48.86.143) 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 15.1.2507.35; Tue, 7 May 2024 14:56:07 +0200 From: Amelie Delaunay To: Vinod Koul , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue CC: , , , , , , Amelie Delaunay Subject: [PATCH v2 08/12] dmaengine: stm32-dma3: add device_pause and device_resume ops Date: Tue, 7 May 2024 14:54:38 +0200 Message-ID: <20240507125442.3989284-9-amelie.delaunay@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240507125442.3989284-1-amelie.delaunay@foss.st.com> References: <20240507125442.3989284-1-amelie.delaunay@foss.st.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SHFCAS1NODE1.st.com (10.75.129.72) To SHFDAG1NODE3.st.com (10.75.129.71) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-05-07_06,2024-05-06_02,2023-05-22_02 STM32 DMA3 controller is able to suspend an ongoing transfer (the transfer is suspended after the ongoing burst is flushed to the destination) and resume it from the point it was suspended. No need to reconfigure any register. Signed-off-by: Amelie Delaunay --- drivers/dma/stm32/stm32-dma3.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/dma/stm32/stm32-dma3.c b/drivers/dma/stm32/stm32-dma3.c index 49e9695357e7..ca0d1a1c0393 100644 --- a/drivers/dma/stm32/stm32-dma3.c +++ b/drivers/dma/stm32/stm32-dma3.c @@ -1240,6 +1240,35 @@ static int stm32_dma3_config(struct dma_chan *c, struct dma_slave_config *config return 0; } +static int stm32_dma3_pause(struct dma_chan *c) +{ + struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c); + int ret; + + ret = stm32_dma3_chan_suspend(chan, true); + if (ret) + return ret; + + chan->dma_status = DMA_PAUSED; + + dev_dbg(chan2dev(chan), "vchan %pK: paused\n", &chan->vchan); + + return 0; +} + +static int stm32_dma3_resume(struct dma_chan *c) +{ + struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c); + + stm32_dma3_chan_suspend(chan, false); + + chan->dma_status = DMA_IN_PROGRESS; + + dev_dbg(chan2dev(chan), "vchan %pK: resumed\n", &chan->vchan); + + return 0; +} + static int stm32_dma3_terminate_all(struct dma_chan *c) { struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c); @@ -1476,6 +1505,8 @@ static int stm32_dma3_probe(struct platform_device *pdev) dma_dev->device_prep_dma_cyclic = stm32_dma3_prep_dma_cyclic; dma_dev->device_caps = stm32_dma3_caps; dma_dev->device_config = stm32_dma3_config; + dma_dev->device_pause = stm32_dma3_pause; + dma_dev->device_resume = stm32_dma3_resume; dma_dev->device_terminate_all = stm32_dma3_terminate_all; dma_dev->device_synchronize = stm32_dma3_synchronize; dma_dev->device_tx_status = dma_cookie_status;