diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/img-mdc-dma.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c index 54db1411ce73..c4d8d5ad2876 100644 --- a/drivers/dma/img-mdc-dma.c +++ b/drivers/dma/img-mdc-dma.c @@ -1009,9 +1009,42 @@ static int mdc_dma_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int img_mdc_suspend_late(struct device *dev) +{ + struct mdc_dma *mdma = dev_get_drvdata(dev); + int i; + + /* Check that all channels are idle */ + for (i = 0; i < mdma->nr_channels; i++) { + struct mdc_chan *mchan = &mdma->channels[i]; + + if (unlikely(mchan->desc)) + return -EBUSY; + } + + clk_disable_unprepare(mdma->clk); + + return 0; +} + +static int img_mdc_resume_early(struct device *dev) +{ + struct mdc_dma *mdma = dev_get_drvdata(dev); + + return clk_prepare_enable(mdma->clk); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops img_mdc_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(img_mdc_suspend_late, + img_mdc_resume_early) +}; + static struct platform_driver mdc_dma_driver = { .driver = { .name = "img-mdc-dma", + .pm = &img_mdc_pm_ops, .of_match_table = of_match_ptr(mdc_dma_of_match), }, .probe = mdc_dma_probe, |