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dmaengine: stm32-dma: add suspend/resume power management support
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>
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1 changed files with 32 additions and 0 deletions
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@ -1427,7 +1427,39 @@ static int stm32_dma_runtime_resume(struct device *dev)
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}
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#endif
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#ifdef CONFIG_PM_SLEEP
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static int stm32_dma_suspend(struct device *dev)
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{
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struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
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int id, ret, scr;
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ret = pm_runtime_get_sync(dev);
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if (ret < 0)
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return ret;
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for (id = 0; id < STM32_DMA_MAX_CHANNELS; id++) {
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scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
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if (scr & STM32_DMA_SCR_EN) {
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dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
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return -EBUSY;
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}
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}
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pm_runtime_put_sync(dev);
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pm_runtime_force_suspend(dev);
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return 0;
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}
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static int stm32_dma_resume(struct device *dev)
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{
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return pm_runtime_force_resume(dev);
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}
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#endif
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static const struct dev_pm_ops stm32_dma_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(stm32_dma_suspend, stm32_dma_resume)
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SET_RUNTIME_PM_OPS(stm32_dma_runtime_suspend,
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stm32_dma_runtime_resume, NULL)
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};
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