diff options
| author | Pierre-Yves MORDRET <pierre-yves.mordret@st.com> | 2020-01-29 16:36:21 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-02-25 11:15:04 +0530 |
| commit | 05f8740a0e6fcd97fe462c7012dff2eed821b529 (patch) | |
| tree | 36c34fbbe1275d90f3e5f56236633a49f22900ae /drivers/dma/stm32-dma.c | |
| parent | 2575cb81a9662ab69ad4a66e29cbc9708d6cc90c (diff) | |
| download | linux-05f8740a0e6fcd97fe462c7012dff2eed821b529.tar.bz2 | |
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>
Diffstat (limited to 'drivers/dma/stm32-dma.c')
| -rw-r--r-- | drivers/dma/stm32-dma.c | 32 |
1 files changed, 32 insertions, 0 deletions
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) }; |