diff options
Diffstat (limited to 'drivers/dma/img-mdc-dma.c')
| -rw-r--r-- | drivers/dma/img-mdc-dma.c | 98 |
1 files changed, 80 insertions, 18 deletions
diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c index 54db1411ce73..0391f930aecc 100644 --- a/drivers/dma/img-mdc-dma.c +++ b/drivers/dma/img-mdc-dma.c @@ -23,6 +23,7 @@ #include <linux/of_device.h> #include <linux/of_dma.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/spinlock.h> @@ -730,14 +731,23 @@ static int mdc_slave_config(struct dma_chan *chan, return 0; } +static int mdc_alloc_chan_resources(struct dma_chan *chan) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct device *dev = mdma2dev(mchan->mdma); + + return pm_runtime_get_sync(dev); +} + static void mdc_free_chan_resources(struct dma_chan *chan) { struct mdc_chan *mchan = to_mdc_chan(chan); struct mdc_dma *mdma = mchan->mdma; + struct device *dev = mdma2dev(mdma); mdc_terminate_all(chan); - mdma->soc->disable_chan(mchan); + pm_runtime_put(dev); } static irqreturn_t mdc_chan_irq(int irq, void *dev_id) @@ -854,6 +864,22 @@ static const struct of_device_id mdc_dma_of_match[] = { }; MODULE_DEVICE_TABLE(of, mdc_dma_of_match); +static int img_mdc_runtime_suspend(struct device *dev) +{ + struct mdc_dma *mdma = dev_get_drvdata(dev); + + clk_disable_unprepare(mdma->clk); + + return 0; +} + +static int img_mdc_runtime_resume(struct device *dev) +{ + struct mdc_dma *mdma = dev_get_drvdata(dev); + + return clk_prepare_enable(mdma->clk); +} + static int mdc_dma_probe(struct platform_device *pdev) { struct mdc_dma *mdma; @@ -883,10 +909,6 @@ static int mdc_dma_probe(struct platform_device *pdev) if (IS_ERR(mdma->clk)) return PTR_ERR(mdma->clk); - ret = clk_prepare_enable(mdma->clk); - if (ret) - return ret; - dma_cap_zero(mdma->dma_dev.cap_mask); dma_cap_set(DMA_SLAVE, mdma->dma_dev.cap_mask); dma_cap_set(DMA_PRIVATE, mdma->dma_dev.cap_mask); @@ -919,12 +941,13 @@ static int mdc_dma_probe(struct platform_device *pdev) "img,max-burst-multiplier", &mdma->max_burst_mult); if (ret) - goto disable_clk; + return ret; mdma->dma_dev.dev = &pdev->dev; mdma->dma_dev.device_prep_slave_sg = mdc_prep_slave_sg; mdma->dma_dev.device_prep_dma_cyclic = mdc_prep_dma_cyclic; mdma->dma_dev.device_prep_dma_memcpy = mdc_prep_dma_memcpy; + mdma->dma_dev.device_alloc_chan_resources = mdc_alloc_chan_resources; mdma->dma_dev.device_free_chan_resources = mdc_free_chan_resources; mdma->dma_dev.device_tx_status = mdc_tx_status; mdma->dma_dev.device_issue_pending = mdc_issue_pending; @@ -945,15 +968,14 @@ static int mdc_dma_probe(struct platform_device *pdev) mchan->mdma = mdma; mchan->chan_nr = i; mchan->irq = platform_get_irq(pdev, i); - if (mchan->irq < 0) { - ret = mchan->irq; - goto disable_clk; - } + if (mchan->irq < 0) + return mchan->irq; + ret = devm_request_irq(&pdev->dev, mchan->irq, mdc_chan_irq, IRQ_TYPE_LEVEL_HIGH, dev_name(&pdev->dev), mchan); if (ret < 0) - goto disable_clk; + return ret; mchan->vc.desc_free = mdc_desc_free; vchan_init(&mchan->vc, &mdma->dma_dev); @@ -962,14 +984,19 @@ static int mdc_dma_probe(struct platform_device *pdev) mdma->desc_pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, sizeof(struct mdc_hw_list_desc), 4, 0); - if (!mdma->desc_pool) { - ret = -ENOMEM; - goto disable_clk; + if (!mdma->desc_pool) + return -ENOMEM; + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = img_mdc_runtime_resume(&pdev->dev); + if (ret) + return ret; } ret = dma_async_device_register(&mdma->dma_dev); if (ret) - goto disable_clk; + goto suspend; ret = of_dma_controller_register(pdev->dev.of_node, mdc_of_xlate, mdma); if (ret) @@ -982,8 +1009,10 @@ static int mdc_dma_probe(struct platform_device *pdev) unregister: dma_async_device_unregister(&mdma->dma_dev); -disable_clk: - clk_disable_unprepare(mdma->clk); +suspend: + if (!pm_runtime_enabled(&pdev->dev)) + img_mdc_runtime_suspend(&pdev->dev); + pm_runtime_disable(&pdev->dev); return ret; } @@ -1004,14 +1033,47 @@ static int mdc_dma_remove(struct platform_device *pdev) tasklet_kill(&mchan->vc.task); } - clk_disable_unprepare(mdma->clk); + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + img_mdc_runtime_suspend(&pdev->dev); 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; + } + + return pm_runtime_force_suspend(dev); +} + +static int img_mdc_resume_early(struct device *dev) +{ + return pm_runtime_force_resume(dev); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops img_mdc_pm_ops = { + SET_RUNTIME_PM_OPS(img_mdc_runtime_suspend, + img_mdc_runtime_resume, NULL) + 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, |