On Fri, Oct 16, 2015 at 09:25:52AM +0100, Jon Hunter wrote:
> @@ -1182,14 +1182,11 @@ static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
> {
> struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
> struct tegra_dma *tdma = tdc->tdma;
> - int ret;
>
> dma_cookie_init(&tdc->dma_chan);
> tdc->config_init = false;
> - ret = clk_prepare_enable(tdma->dma_clk);
> - if (ret < 0)
> - dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret);
> - return ret;
> +
> + return pm_runtime_get_sync(tdma->dev);
Alloc channel is supposed to return number of descriptors allocated and if
pm_runtime_get_sync() returns postive values we get wrong return!
> 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);
do we need pm_runtime_get() here, should we use pm_request_resume() ?
> static int tegra_dma_pm_suspend(struct device *dev)
> {
> struct tegra_dma *tdma = dev_get_drvdata(dev);
> - int i;
> - int ret;
> + int i, ret;
>
> /* Enable clock before accessing register */
> - ret = tegra_dma_runtime_resume(dev);
> + ret = pm_runtime_get_sync(dev);
If you are runtime suspended then core will runtime resume you before
invoking suspend, so why do we need this
--
~Vinod
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