From: Amelie Delaunay <amelie.delaunay@st.com>
To: Vinod Koul <vkoul@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: Amelie Delaunay <amelie.delaunay@st.com>,
linux-kernel@vger.kernel.org,
Pierre-Yves MORDRET <pierre-yves.mordret@st.com>,
dmaengine@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/6] dmaengine: stm32-mdma: add suspend/resume power management support
Date: Mon, 27 Jan 2020 09:53:29 +0100 [thread overview]
Message-ID: <20200127085334.13163-2-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200127085334.13163-1-amelie.delaunay@st.com>
From: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Add suspend/resume power management relying on PM Runtime engine.
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
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
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next prev parent reply other threads:[~2020-01-27 8:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-27 8:53 [PATCH 0/6] STM32 MDMA driver fixes and improvements Amelie Delaunay
2020-01-27 8:53 ` Amelie Delaunay [this message]
2020-01-27 8:53 ` [PATCH 2/6] dmaengine: stm32-mdma: use reset controller only at probe time Amelie Delaunay
2020-01-27 8:53 ` [PATCH 3/6] dmaengine: stm32-mdma: disable clock in case of error during probe Amelie Delaunay
2020-01-27 8:53 ` [PATCH 4/6] dmaengine: stm32-mdma: driver defers probe for clock and reset Amelie Delaunay
2020-01-27 8:53 ` [PATCH 5/6] dmaengine: stm32-mdma: enable descriptor_reuse Amelie Delaunay
2020-01-27 8:53 ` [PATCH 6/6] dmaengine: stm32-mdma: use vchan_terminate_vdesc() in .terminate_all Amelie Delaunay
2020-02-24 16:50 ` [PATCH 0/6] STM32 MDMA driver fixes and improvements Vinod Koul
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