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dmaengine: stm32-mdma: 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/20200127085334.13163-2-amelie.delaunay@st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Yves MORDRET 2020-01-27 09:53:29 +01:00 committed by Vinod Koul
parent 35e032462b
commit 7cb819c856
1 changed files with 33 additions and 0 deletions
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33
drivers/dma/stm32-mdma.c
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@ -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)
};