From: Pierre-Yves MORDRET <pierre-yves.mordret@xxxxxx>
Add suspend/resume power management relying on PM Runtime engine.
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@xxxxxx>
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
---
drivers/dma/stm32-dma.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 5989b0893521..136deabd1aa3 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1427,7 +1427,39 @@ static int stm32_dma_runtime_resume(struct device *dev)
}
#endif
+#ifdef CONFIG_PM_SLEEP
+static int stm32_dma_suspend(struct device *dev)
+{
+ struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
+ int id, ret, scr;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ return ret;
+
+ for (id = 0; id < STM32_DMA_MAX_CHANNELS; id++) {
+ scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
+ if (scr & STM32_DMA_SCR_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_dma_resume(struct device *dev)
+{
+ return pm_runtime_force_resume(dev);
+}
+#endif
+
static const struct dev_pm_ops stm32_dma_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(stm32_dma_suspend, stm32_dma_resume)
SET_RUNTIME_PM_OPS(stm32_dma_runtime_suspend,
stm32_dma_runtime_resume, NULL)
};
--
2.17.1
