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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 26A27C35247 for ; Mon, 27 Jan 2020 08:54:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F057620702 for ; Mon, 27 Jan 2020 08:54:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="YImN5QDA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729068AbgA0IyM (ORCPT ); Mon, 27 Jan 2020 03:54:12 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:18112 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729424AbgA0IyF (ORCPT ); Mon, 27 Jan 2020 03:54:05 -0500 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00R8rFdG011482; Mon, 27 Jan 2020 09:53:47 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=LtSHbdDzwkhiZy1H0EyZ/LNU5Qx0QFD829og3RZwGKs=; b=YImN5QDAJ5SKzsF1n+ufDKihYRX45WURp8FPosQTzM0WVB9mujnHP6WlH4LkNSscIlts KGd8oFY4DRHUB6sdbgkNVWazgrbM9aiEasOIAMds5Ms4Hy42Xf2xTPkcrr8Rk9aru7nB Bq22vnQ3Zix3LKxXKUuVM3+9JGK+i66E/Ukcu6Wp5FQJ5Fd3lA/tb2UUaqWyD6ai44lj zuuC1U6fZciw9HQ+phYRtCOs0g5RTongw7XV9vkOjrYNkPZQG+0jy8p7CHM+1TsN0etg emFcN3Y/jsFtGti0+RC2tP1kOPMJJuv6DGZpRcpldeL5ijE6YNneUnEs7q0EQ+kXAiyQ 6g== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2xrbpar4sv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 27 Jan 2020 09:53:47 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id F15DD10003B; Mon, 27 Jan 2020 09:53:42 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id E54F021CA6A; Mon, 27 Jan 2020 09:53:42 +0100 (CET) Received: from localhost (10.75.127.47) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Mon, 27 Jan 2020 09:53:42 +0100 From: Amelie Delaunay To: Vinod Koul , Dan Williams , Maxime Coquelin , Alexandre Torgue CC: , , , , Amelie Delaunay , Pierre-Yves MORDRET Subject: [PATCH 1/6] dmaengine: stm32-mdma: add suspend/resume power management support Date: Mon, 27 Jan 2020 09:53:29 +0100 Message-ID: <20200127085334.13163-2-amelie.delaunay@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200127085334.13163-1-amelie.delaunay@st.com> References: <20200127085334.13163-1-amelie.delaunay@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG1NODE3.st.com (10.75.127.3) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-27_02:2020-01-24,2020-01-27 signatures=0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Pierre-Yves MORDRET Add suspend/resume power management relying on PM Runtime engine. Signed-off-by: Pierre-Yves MORDRET Signed-off-by: Amelie Delaunay --- drivers/dma/stm32-mdma.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 5838311cf990..2898411941d5 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -1697,7 +1697,40 @@ static int stm32_mdma_runtime_resume(struct device *dev) } #endif +#ifdef CONFIG_PM_SLEEP +static int stm32_mdma_pm_suspend(struct device *dev) +{ + struct stm32_mdma_device *dmadev = dev_get_drvdata(dev); + u32 ccr, id; + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) + return ret; + + for (id = 0; id < dmadev->nr_channels; id++) { + ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id)); + if (ccr & STM32_MDMA_CCR_EN) { + dev_warn(dev, "Suspend is prevented by Chan %i\n", id); + return -EBUSY; + } + } + + pm_runtime_put_sync(dev); + + pm_runtime_force_suspend(dev); + + return 0; +} + +static int stm32_mdma_pm_resume(struct device *dev) +{ + return pm_runtime_force_resume(dev); +} +#endif + static const struct dev_pm_ops stm32_mdma_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_mdma_pm_suspend, stm32_mdma_pm_resume) SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend, stm32_mdma_runtime_resume, NULL) }; -- 2.17.1