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| author | Pierre-Yves MORDRET <pierre-yves.mordret@st.com> | 2020-01-27 09:53:29 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-02-24 17:50:01 +0100 |
| commit | 7cb819c856d9668f6146ba3caa46d54efb17d9e9 (patch) | |
| tree | a4d6743308d4d782c07d4559748dc2baf8c2eb2b /drivers/dma/stm32-mdma.c | |
| parent | dmanegine: ioat/dca: Replace zero-length array with flexible-array member (diff) | |
| download | linux-7cb819c856d9668f6146ba3caa46d54efb17d9e9.tar.xz linux-7cb819c856d9668f6146ba3caa46d54efb17d9e9.zip | |
dmaengine: stm32-mdma: 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/20200127085334.13163-2-amelie.delaunay@st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/stm32-mdma.c')
| -rw-r--r-- | drivers/dma/stm32-mdma.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 5838311cf990..2898411941d5 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -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) }; |