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: <dmaengine@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Amelie Delaunay <amelie.delaunay@st.com>,
Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Subject: [PATCH 1/4] dmaengine: stm32-dmamux: add suspend/resume power management support
Date: Tue, 28 Jan 2020 10:41:55 +0100 [thread overview]
Message-ID: <20200128094158.20361-2-amelie.delaunay@st.com> (raw)
In-Reply-To: <20200128094158.20361-1-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-dmamux.c | 50 ++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
index 3c89bd39e096..08d2395c8943 100644
--- a/drivers/dma/stm32-dmamux.c
+++ b/drivers/dma/stm32-dmamux.c
@@ -41,6 +41,9 @@ struct stm32_dmamux_data {
u32 dmamux_requests; /* Number of DMA requests routed toward DMAs */
spinlock_t lock; /* Protects register access */
unsigned long *dma_inuse; /* Used DMA channel */
+ u32 ccr[STM32_DMAMUX_MAX_DMA_REQUESTS]; /* Used to backup CCR register
+ * in suspend
+ */
u32 dma_reqs[]; /* Number of DMA Request per DMA masters.
* [0] holds number of DMA Masters.
* To be kept at very end end of this structure
@@ -318,7 +321,54 @@ static int stm32_dmamux_runtime_resume(struct device *dev)
}
#endif
+#ifdef CONFIG_PM_SLEEP
+static int stm32_dmamux_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
+ int i, ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < stm32_dmamux->dma_requests; i++)
+ stm32_dmamux->ccr[i] = stm32_dmamux_read(stm32_dmamux->iomem,
+ STM32_DMAMUX_CCR(i));
+
+ pm_runtime_put_sync(dev);
+
+ pm_runtime_force_suspend(dev);
+
+ return 0;
+}
+
+static int stm32_dmamux_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
+ int i, ret;
+
+ ret = pm_runtime_force_resume(dev);
+ if (ret < 0)
+ return ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < stm32_dmamux->dma_requests; i++)
+ stm32_dmamux_write(stm32_dmamux->iomem, STM32_DMAMUX_CCR(i),
+ stm32_dmamux->ccr[i]);
+
+ pm_runtime_put_sync(dev);
+
+ return 0;
+}
+#endif
+
static const struct dev_pm_ops stm32_dmamux_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(stm32_dmamux_suspend, stm32_dmamux_resume)
SET_RUNTIME_PM_OPS(stm32_dmamux_runtime_suspend,
stm32_dmamux_runtime_resume, NULL)
};
--
2.17.1
next prev parent reply other threads:[~2020-01-28 9:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-28 9:41 [PATCH 0/4] STM32 DMAMUX driver fixes and improvements Amelie Delaunay
2020-01-28 9:41 ` Amelie Delaunay [this message]
2020-01-28 9:41 ` [PATCH 2/4] dmaengine: stm32-dmamux: fix clock handling in probe sequence Amelie Delaunay
2020-01-28 9:41 ` [PATCH 3/4] dmaengine: stm32-dmamux: use reset controller only at probe time Amelie Delaunay
2020-01-28 9:41 ` [PATCH 4/4] dmaengine: stm32-dmamux: driver defers probe for clock and reset Amelie Delaunay
2020-02-24 16:52 ` [PATCH 0/4] STM32 DMAMUX driver fixes and improvements Vinod Koul
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