From patchwork Tue Apr 23 12:32:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amelie Delaunay X-Patchwork-Id: 13639961 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) (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 1E5748662E; Tue, 23 Apr 2024 12:35:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.207.212.93 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713875732; cv=none; b=PLGaa2LT7cIrPq43amt6eEXTzbC1bBTINpCabXGVWPFAmEE7L3ouiGk1/z8dhIJmDDTXgE0gS0XygYgltwOdHXMxvWn02HuYRLQfZkONmbJELgrRMgG7dfDzXqxsgnFl97iL2T9E6XBhLDg1xBkNhTMEJo8cRSTpCKaqtj2zXcM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713875732; c=relaxed/simple; bh=KUMjCLwyexGHehdITk2osDVTjluDSc2/d0GeWnJvpSM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=p/IIatsfP86SeNjmMkosHg7IkT2xADQMPU4jFXiqnrZONEqS6e/2D8eujzDvRN1dzMbv9PgRObyLzkpuGK4WTo6Eej99iG0N1IJkK3u+uSyvN7CwfZ1/XEgAa1EVhfXKZzUssvqqAYMnNH54gC/JegGs0lZrRS93MU/0Tglvr30= 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=Ve2srZ8Z; arc=none smtp.client-ip=91.207.212.93 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="Ve2srZ8Z" Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 43NC6KsN010851; Tue, 23 Apr 2024 14:35:18 +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=0lRkuvSdl6Mlk2dshvBI3b/EuEs0Up49ERtTgNfVIko=; b=Ve 2srZ8ZVfWjqUZwDN6YcdSRE8qIiAnyBsbP7mODYk9bBv7X2fI7sXIfStzGny6VKg DCXy6ABlYP2v4ji6Sive6NMWJvV0QXB1D1gmF0bh3qRNxuRI1aUq4VX7cSW0O23H RyBys7WdYXo8Sz411BlCOO844ju+STdqqSWblsnMWBjfrUbpA6j6oZGortZzZmOE pHtzI4kWdRkY8Bw69hRvMmjGP3YRRcAtvKzscJbb4WeQoaGp1emPJ8N67OV9u/7/ swTKX5FKHnMGdrgNPoc2CGbCBydCMp4uz+A8X/75WHO9bieyfUf+RifzWsZNafTV 0CcvjYRp2w8NwAdFHpNg== 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 3xm4edudu0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 23 Apr 2024 14:35:18 +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 EA68440045; Tue, 23 Apr 2024 14:35:14 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node3.st.com [10.75.129.71]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 1DE6021A23C; Tue, 23 Apr 2024 14:34:30 +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, 23 Apr 2024 14:34:29 +0200 From: Amelie Delaunay To: Vinod Koul , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue CC: , , , , , , Amelie Delaunay Subject: [PATCH 08/12] dmaengine: stm32-dma3: add device_pause and device_resume ops Date: Tue, 23 Apr 2024 14:32:58 +0200 Message-ID: <20240423123302.1550592-9-amelie.delaunay@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240423123302.1550592-1-amelie.delaunay@foss.st.com> References: <20240423123302.1550592-1-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:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-23_11,2024-04-23_01,2023-05-22_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 73e856a5aeab..3d827c33150e 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;