On Mon, Jan 28, 2013 at 05:12:27PM +0530, Vivek Gautam wrote:
> Enabling runtime power management on dwc3-exynos to save
> power and allow its PHY's power to be managed at runtime.
>
> Signed-off-by: Vivek Gautam <gautam.vi...@samsung.com>
> ---
> drivers/usb/dwc3/dwc3-exynos.c | 47
> ++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 47 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
> index aae5328..c51e8c1 100644
> --- a/drivers/usb/dwc3/dwc3-exynos.c
> +++ b/drivers/usb/dwc3/dwc3-exynos.c
> @@ -157,11 +157,15 @@ static int dwc3_exynos_probe(struct platform_device
> *pdev)
> goto err4;
> }
>
> + pm_runtime_set_active(&pdev->dev);
> + pm_runtime_enable(&pdev->dev);
> +
> return 0;
>
> err4:
> clk_disable(clk);
> clk_put(clk);
> + pm_runtime_disable(&pdev->dev);
> err3:
> platform_device_put(dwc3);
> err1:
> @@ -174,6 +178,8 @@ static int dwc3_exynos_remove(struct platform_device
> *pdev)
> {
> struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
>
> + pm_runtime_disable(&pdev->dev);
> +
> platform_device_unregister(exynos->dwc3);
> platform_device_unregister(exynos->usb2_phy);
> platform_device_unregister(exynos->usb3_phy);
> @@ -186,6 +192,46 @@ static int dwc3_exynos_remove(struct platform_device
> *pdev)
> return 0;
> }
>
> +static int dwc3_exynos_runtime_suspend(struct device *dev)
> +{
> + struct dwc3_exynos *exynos = dev_get_drvdata(dev);
> + struct platform_device *pdev_dwc = exynos->dwc3;
> + struct dwc3 *dwc = NULL;
> +
> + dwc = platform_get_drvdata(pdev_dwc);
> +
> + if (!dwc)
> + return 0;
> +
> + pm_runtime_put_sync(dwc->usb3_phy->dev);
> +
> + clk_disable(exynos->clk);
> +
> + return 0;
> +}
> +static int dwc3_exynos_runtime_resume(struct device *dev)
> +{
> + struct dwc3_exynos *exynos = dev_get_drvdata(dev);
> + struct platform_device *pdev_dwc = exynos->dwc3;
> + struct dwc3 *dwc = NULL;
> +
> + dwc = platform_get_drvdata(pdev_dwc);
> +
> + clk_enable(exynos->clk);
> +
> + if (!dwc)
> + return 0;
> +
> + pm_runtime_get_sync(dwc->usb3_phy->dev);dude, this is wrong :-) look at this: pm_runtime_get() -> dwc3_exynos_runtime_resume() -> pm_runtime_get_sync() -> dwc3_exynos_runtime_resume() -> ... only your clock enalbe should do -- balbi
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