Hi Balbi,
On Mon, Jan 28, 2013 at 5:17 PM, Felipe Balbi <balbi@xxxxxx> wrote:
> 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.vivek@xxxxxxxxxxx>
>> ---
>> 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
>
We want to wake up "dwc->usb3_phy" so tried to call pm_runtime_get_sync()
with "dwc->usb3_phy->dev".
Missing something ? :-(
--
Thanks & Regards
Vivek
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