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dmaengine: stm32-dma: add suspend/resume power management support

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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>
Link: https://lore.kernel.org/r/20200129153628.29329-2-amelie.delaunay@st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Yves MORDRET 2020-01-29 16:36:21 +01:00 committed by Vinod Koul
parent 2575cb81a9
commit 05f8740a0e
1 changed files with 32 additions and 0 deletions
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32
drivers/dma/stm32-dma.c
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@ -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)
};