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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 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200127_005358_535091_7CF590B8 X-CRM114-Status: GOOD ( 14.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Amelie Delaunay , linux-kernel@vger.kernel.org, Pierre-Yves MORDRET , dmaengine@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel