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dmaengine: qcom-bam-dma: Add pm_runtime support
Adds pm_runtime support for BAM DMA so that clock is enabled only when there is a transaction going on to help save power. Signed-off-by: Pramod Gurav <pramod.gurav@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Pramod Gurav
Vinod Koul
parent
1a695a905c
commit
7d2545599f
1 changed files with 109 additions and 1 deletions
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@ -48,6 +48,7 @@
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#include <linux/of_dma.h>
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#include <linux/clk.h>
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#include <linux/dmaengine.h>
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#include <linux/pm_runtime.h>
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#include "../dmaengine.h"
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#include "../virt-dma.h"
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@ -58,6 +59,8 @@ struct bam_desc_hw {
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__le16 flags;
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};
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#define BAM_DMA_AUTOSUSPEND_DELAY 100
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#define DESC_FLAG_INT BIT(15)
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#define DESC_FLAG_EOT BIT(14)
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#define DESC_FLAG_EOB BIT(13)
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@ -527,12 +530,17 @@ static void bam_free_chan(struct dma_chan *chan)
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struct bam_device *bdev = bchan->bdev;
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u32 val;
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unsigned long flags;
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int ret;
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ret = pm_runtime_get_sync(bdev->dev);
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if (ret < 0)
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return;
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vchan_free_chan_resources(to_virt_chan(chan));
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if (bchan->curr_txd) {
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dev_err(bchan->bdev->dev, "Cannot free busy channel\n");
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return;
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goto err;
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}
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spin_lock_irqsave(&bchan->vc.lock, flags);
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@ -550,6 +558,10 @@ static void bam_free_chan(struct dma_chan *chan)
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/* disable irq */
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writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_IRQ_EN));
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err:
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pm_runtime_mark_last_busy(bdev->dev);
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pm_runtime_put_autosuspend(bdev->dev);
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}
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/**
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@ -696,11 +708,18 @@ static int bam_pause(struct dma_chan *chan)
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struct bam_chan *bchan = to_bam_chan(chan);
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struct bam_device *bdev = bchan->bdev;
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unsigned long flag;
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int ret;
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ret = pm_runtime_get_sync(bdev->dev);
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if (ret < 0)
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return ret;
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spin_lock_irqsave(&bchan->vc.lock, flag);
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writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_HALT));
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bchan->paused = 1;
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spin_unlock_irqrestore(&bchan->vc.lock, flag);
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pm_runtime_mark_last_busy(bdev->dev);
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pm_runtime_put_autosuspend(bdev->dev);
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return 0;
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}
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@ -715,11 +734,18 @@ static int bam_resume(struct dma_chan *chan)
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struct bam_chan *bchan = to_bam_chan(chan);
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struct bam_device *bdev = bchan->bdev;
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unsigned long flag;
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int ret;
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ret = pm_runtime_get_sync(bdev->dev);
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if (ret < 0)
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return ret;
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spin_lock_irqsave(&bchan->vc.lock, flag);
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writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_HALT));
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bchan->paused = 0;
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spin_unlock_irqrestore(&bchan->vc.lock, flag);
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pm_runtime_mark_last_busy(bdev->dev);
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pm_runtime_put_autosuspend(bdev->dev);
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return 0;
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}
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@ -795,6 +821,7 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
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{
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struct bam_device *bdev = data;
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u32 clr_mask = 0, srcs = 0;
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int ret;
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srcs |= process_channel_irqs(bdev);
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@ -802,6 +829,10 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
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if (srcs & P_IRQ)
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tasklet_schedule(&bdev->task);
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ret = pm_runtime_get_sync(bdev->dev);
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if (ret < 0)
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return ret;
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if (srcs & BAM_IRQ) {
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clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS));
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@ -814,6 +845,9 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
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writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
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}
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pm_runtime_mark_last_busy(bdev->dev);
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pm_runtime_put_autosuspend(bdev->dev);
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return IRQ_HANDLED;
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}
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@ -893,6 +927,7 @@ static void bam_start_dma(struct bam_chan *bchan)
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struct bam_desc_hw *desc;
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struct bam_desc_hw *fifo = PTR_ALIGN(bchan->fifo_virt,
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sizeof(struct bam_desc_hw));
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int ret;
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lockdep_assert_held(&bchan->vc.lock);
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@ -904,6 +939,10 @@ static void bam_start_dma(struct bam_chan *bchan)
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async_desc = container_of(vd, struct bam_async_desc, vd);
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bchan->curr_txd = async_desc;
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ret = pm_runtime_get_sync(bdev->dev);
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if (ret < 0)
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return;
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/* on first use, initialize the channel hardware */
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if (!bchan->initialized)
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bam_chan_init_hw(bchan, async_desc->dir);
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@ -946,6 +985,9 @@ static void bam_start_dma(struct bam_chan *bchan)
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wmb();
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writel_relaxed(bchan->tail * sizeof(struct bam_desc_hw),
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bam_addr(bdev, bchan->id, BAM_P_EVNT_REG));
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pm_runtime_mark_last_busy(bdev->dev);
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pm_runtime_put_autosuspend(bdev->dev);
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}
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/**
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@ -970,6 +1012,7 @@ static void dma_tasklet(unsigned long data)
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bam_start_dma(bchan);
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spin_unlock_irqrestore(&bchan->vc.lock, flags);
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}
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}
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/**
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@ -1213,6 +1256,13 @@ static int bam_dma_probe(struct platform_device *pdev)
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if (ret)
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goto err_unregister_dma;
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pm_runtime_irq_safe(&pdev->dev);
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pm_runtime_set_autosuspend_delay(&pdev->dev, BAM_DMA_AUTOSUSPEND_DELAY);
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pm_runtime_use_autosuspend(&pdev->dev);
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pm_runtime_mark_last_busy(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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return 0;
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err_unregister_dma:
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@ -1233,6 +1283,8 @@ static int bam_dma_remove(struct platform_device *pdev)
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struct bam_device *bdev = platform_get_drvdata(pdev);
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u32 i;
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pm_runtime_force_suspend(&pdev->dev);
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of_dma_controller_free(pdev->dev.of_node);
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dma_async_device_unregister(&bdev->common);
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@ -1260,11 +1312,67 @@ static int bam_dma_remove(struct platform_device *pdev)
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return 0;
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}
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static int bam_dma_runtime_suspend(struct device *dev)
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{
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struct bam_device *bdev = dev_get_drvdata(dev);
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clk_disable(bdev->bamclk);
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return 0;
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}
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static int bam_dma_runtime_resume(struct device *dev)
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{
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struct bam_device *bdev = dev_get_drvdata(dev);
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int ret;
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ret = clk_enable(bdev->bamclk);
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if (ret < 0) {
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dev_err(dev, "clk_enable failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int bam_dma_suspend(struct device *dev)
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{
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struct bam_device *bdev = dev_get_drvdata(dev);
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pm_runtime_force_suspend(dev);
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clk_unprepare(bdev->bamclk);
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return 0;
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}
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static int bam_dma_resume(struct device *dev)
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{
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struct bam_device *bdev = dev_get_drvdata(dev);
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int ret;
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ret = clk_prepare(bdev->bamclk);
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if (ret)
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return ret;
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pm_runtime_force_resume(dev);
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return 0;
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}
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#endif
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static const struct dev_pm_ops bam_dma_pm_ops = {
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SET_LATE_SYSTEM_SLEEP_PM_OPS(bam_dma_suspend, bam_dma_resume)
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SET_RUNTIME_PM_OPS(bam_dma_runtime_suspend, bam_dma_runtime_resume,
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NULL)
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};
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static struct platform_driver bam_dma_driver = {
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.probe = bam_dma_probe,
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.remove = bam_dma_remove,
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.driver = {
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.name = "bam-dma-engine",
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.pm = &bam_dma_pm_ops,
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.of_match_table = bam_of_match,
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},
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};
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