diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index c8f79dcaaee8..935da8192f59 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -296,7 +296,7 @@ static struct tegra_dma_desc *tegra_dma_desc_get( spin_unlock_irqrestore(&tdc->lock, flags); /* Allocate DMA desc */ - dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC); + dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT); if (!dma_desc) { dev_err(tdc2dev(tdc), "dma_desc alloc failed\n"); return NULL; @@ -336,7 +336,7 @@ static struct tegra_dma_sg_req *tegra_dma_sg_req_get( } spin_unlock_irqrestore(&tdc->lock, flags); - sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC); + sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_NOWAIT); if (!sg_req) dev_err(tdc2dev(tdc), "sg_req alloc failed\n"); return sg_req; @@ -1186,10 +1186,12 @@ static int tegra_dma_alloc_chan_resources(struct dma_chan *dc) dma_cookie_init(&tdc->dma_chan); tdc->config_init = false; - ret = clk_prepare_enable(tdma->dma_clk); + + ret = pm_runtime_get_sync(tdma->dev); if (ret < 0) - dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret); - return ret; + return ret; + + return 0; } static void tegra_dma_free_chan_resources(struct dma_chan *dc) @@ -1232,7 +1234,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc) list_del(&sg_req->node); kfree(sg_req); } - clk_disable_unprepare(tdma->dma_clk); + pm_runtime_put(tdma->dev); tdc->slave_id = 0; } @@ -1356,20 +1358,14 @@ static int tegra_dma_probe(struct platform_device *pdev) spin_lock_init(&tdma->global_lock); pm_runtime_enable(&pdev->dev); - if (!pm_runtime_enabled(&pdev->dev)) { + if (!pm_runtime_enabled(&pdev->dev)) ret = tegra_dma_runtime_resume(&pdev->dev); - if (ret) { - dev_err(&pdev->dev, "dma_runtime_resume failed %d\n", - ret); - goto err_pm_disable; - } - } + else + ret = pm_runtime_get_sync(&pdev->dev); - /* Enable clock before accessing registers */ - ret = clk_prepare_enable(tdma->dma_clk); if (ret < 0) { - dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret); - goto err_pm_disable; + pm_runtime_disable(&pdev->dev); + return ret; } /* Reset DMA controller */ @@ -1382,7 +1378,7 @@ static int tegra_dma_probe(struct platform_device *pdev) tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0); tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul); - clk_disable_unprepare(tdma->dma_clk); + pm_runtime_put(&pdev->dev); INIT_LIST_HEAD(&tdma->dma_dev.channels); for (i = 0; i < cdata->nr_channels; i++) { @@ -1400,8 +1396,7 @@ static int tegra_dma_probe(struct platform_device *pdev) } tdc->irq = res->start; snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i); - ret = devm_request_irq(&pdev->dev, tdc->irq, - tegra_dma_isr, 0, tdc->name, tdc); + ret = request_irq(tdc->irq, tegra_dma_isr, 0, tdc->name, tdc); if (ret) { dev_err(&pdev->dev, "request_irq failed with err %d channel %d\n", @@ -1482,10 +1477,11 @@ static int tegra_dma_probe(struct platform_device *pdev) err_irq: while (--i >= 0) { struct tegra_dma_channel *tdc = &tdma->channels[i]; + + free_irq(tdc->irq, tdc); tasklet_kill(&tdc->tasklet); } -err_pm_disable: pm_runtime_disable(&pdev->dev); if (!pm_runtime_status_suspended(&pdev->dev)) tegra_dma_runtime_suspend(&pdev->dev); @@ -1502,6 +1498,7 @@ static int tegra_dma_remove(struct platform_device *pdev) for (i = 0; i < tdma->chip_data->nr_channels; ++i) { tdc = &tdma->channels[i]; + free_irq(tdc->irq, tdc); tasklet_kill(&tdc->tasklet); } @@ -1514,8 +1511,7 @@ static int tegra_dma_remove(struct platform_device *pdev) static int tegra_dma_runtime_suspend(struct device *dev) { - struct platform_device *pdev = to_platform_device(dev); - struct tegra_dma *tdma = platform_get_drvdata(pdev); + struct tegra_dma *tdma = dev_get_drvdata(dev); clk_disable_unprepare(tdma->dma_clk); return 0; @@ -1523,8 +1519,7 @@ static int tegra_dma_runtime_suspend(struct device *dev) static int tegra_dma_runtime_resume(struct device *dev) { - struct platform_device *pdev = to_platform_device(dev); - struct tegra_dma *tdma = platform_get_drvdata(pdev); + struct tegra_dma *tdma = dev_get_drvdata(dev); int ret; ret = clk_prepare_enable(tdma->dma_clk); @@ -1543,7 +1538,7 @@ static int tegra_dma_pm_suspend(struct device *dev) int ret; /* Enable clock before accessing register */ - ret = tegra_dma_runtime_resume(dev); + ret = pm_runtime_get_sync(dev); if (ret < 0) return ret; @@ -1552,15 +1547,22 @@ static int tegra_dma_pm_suspend(struct device *dev) struct tegra_dma_channel *tdc = &tdma->channels[i]; struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg; + /* Only save the state of DMA channels that are in use */ + if (!tdc->config_init) + continue; + ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR); ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR); ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR); ch_reg->ahb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBSEQ); ch_reg->apb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBSEQ); + if (tdma->chip_data->support_separate_wcount_reg) + ch_reg->wcount = tdc_read(tdc, + TEGRA_APBDMA_CHAN_WCOUNT); } /* Disable clock */ - tegra_dma_runtime_suspend(dev); + pm_runtime_put(dev); return 0; } @@ -1571,7 +1573,7 @@ static int tegra_dma_pm_resume(struct device *dev) int ret; /* Enable clock before accessing register */ - ret = tegra_dma_runtime_resume(dev); + ret = pm_runtime_get_sync(dev); if (ret < 0) return ret; @@ -1583,6 +1585,13 @@ static int tegra_dma_pm_resume(struct device *dev) struct tegra_dma_channel *tdc = &tdma->channels[i]; struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg; + /* Only restore the state of DMA channels that are in use */ + if (!tdc->config_init) + continue; + + if (tdma->chip_data->support_separate_wcount_reg) + tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, + ch_reg->wcount); tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq); tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr); tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq); @@ -1592,16 +1601,14 @@ static int tegra_dma_pm_resume(struct device *dev) } /* Disable clock */ - tegra_dma_runtime_suspend(dev); + pm_runtime_put(dev); return 0; } #endif static const struct dev_pm_ops tegra_dma_dev_pm_ops = { -#ifdef CONFIG_PM - .runtime_suspend = tegra_dma_runtime_suspend, - .runtime_resume = tegra_dma_runtime_resume, -#endif + SET_RUNTIME_PM_OPS(tegra_dma_runtime_suspend, tegra_dma_runtime_resume, + NULL) SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume) };