[PATCH 1/7] DMA: PL330: Add support runtime PM for PL330 DMAC

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Mon, Jul 04, 2011 at 09:18:29PM +0900, Kukjin Kim wrote:
> @@ -666,6 +667,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  	struct dma_device *pd;
>  	struct resource *res;
>  	int i, ret, irq;
> +	struct clk* clk;

Please use checkpatch.  'struct clk *clk;'

> @@ -696,6 +698,28 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
>  		goto probe_err1;
>  	}
>  

Get the clock here and save its pointer.  put the clock in the remove function.

> +#ifdef CONFIG_PM_RUNTIME
> +	/* to use the runtime PM helper functions */
> +	pm_runtime_enable(&adev->dev);
> +
> +	/* enable the power domain */
> +	if (pm_runtime_get_sync(&adev->dev)) {
> +		dev_err(&adev->dev, "failed to get runtime pm\n");
> +		ret = -ENODEV;
> +		goto probe_err1;
> +	}
> +#else
> +	/* enable dma clk */
> +	clk = clk_get(&adev->dev, "dma");
> +
> +	if (IS_ERR(clk)) {
> +		dev_err(&adev->dev, "Cannot get operation clock.\n");
> +		ret = -EINVAL;
> +		goto probe_err1;
> +	}
> +	clk_enable(clk);
> +#endif
> +
>  	irq = adev->irq[0];
>  	ret = request_irq(irq, pl330_irq_handler, 0,
>  			dev_name(&adev->dev), pi);
> @@ -838,10 +862,47 @@ static struct amba_id pl330_ids[] = {
>  	{ 0, 0 },
>  };
>  
> +#ifdef CONFIG_PM_RUNTIME
> +static int pl330_runtime_suspend(struct device *dev)
> +{
> +	struct clk *dmaclk = clk_get(dev, "dma");
> +
> +	if (dmaclk == NULL) {
> +		dev_err(dev, "failed to find dma clock source\n");
> +		return -ENODEV;
> +	}

Obviously wrong.

Use the clock you got in the probe function here.

> +
> +	clk_disable(dmaclk);
> +	return 0;
> +}
> +
> +static int pl330_runtime_resume(struct device *dev)
> +{
> +	struct clk *dmaclk = clk_get(dev, "dma");
> +
> +	if (dmaclk == NULL) {
> +		dev_err(dev, "failed to find dma clock source\n");
> +		return -ENODEV;
> +	}

Obviously wrong as well.

Use the clock you got in the probe function here too.

> +
> +	clk_enable(dmaclk);
> +	return 0;
> +}
> +#else
> +#define pl330_runtime_suspend	NULL
> +#define pl330_runtime_resume	NULL
> +#endif /* CONFIG_PM_RUNTIME */
> +
> +static const struct dev_pm_ops pl330_pm_ops = {
> +	.runtime_suspend = pl330_runtime_suspend,
> +	.runtime_resume = pl330_runtime_resume,
> +};
> +
>  static struct amba_driver pl330_driver = {
>  	.drv = {
>  		.owner = THIS_MODULE,
>  		.name = "dma-pl330",
> +		.pm = &pl330_pm_ops,
>  	},
>  	.id_table = pl330_ids,
>  	.probe = pl330_probe,
> -- 
> 1.7.1
> 
> 
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