Hi,
On 18 May 2016 at 18:22, Felipe Balbi <ba...@kernel.org> wrote:
>
> Hi,
>
> Baolin Wang <baolin.w...@linaro.org> writes:
>>>> @@ -1485,16 +1490,11 @@ static int dwc3_gadget_run_stop(struct dwc3
>>>> *dwc, int is_on, int suspend)
>>>> {
>>>> u32 reg;
>>>> u32 timeout = 500, i;
>>>>
>>>> + if (pm_runtime_suspended(dwc->dev))
>>>> + return 0;
>>>>
>>>> (2)
>>>> @@ -1748,15 +1754,25 @@ static int dwc3_gadget_start(struct usb_gadget *g,
>>>> * even though host mode might be active. Don't actually perform
>>>> * device-specific initialization until device mode is activated.
>>>> */
>>>>
>>>> + if (pm_runtime_suspended(dwc->dev)) {
>>>> + spin_unlock_irqrestore(&dwc->lock, flags);
>>>> + return 0;
>>>> + }
>>>>
>>>> + ret = __dwc3_gadget_start(dwc);
>>>> + if (ret)
>>>> + goto err1;
>>>>
>>>> So I think the dwc3 core can enter suspend mode before gadget function
>>>> is ready to call the 'usb_gadget_udc_start()' and
>>>> 'usb_udc_connect_control()', then if the dwc3 core has entered
>>>> suspended mode, we need to return success when starting the gadget,
>>>> and leave the gadget starting action from gadget resume. What do you
>>>> think about that? Thanks.
>>>
>>> Well, if this makes it work properly. Then, yeah; looks okay to me. I'll
>>> add this to the patch introducing runtime PM.
>>
>> OK.
>
> I've updated the branch with slightly modified version of your
> changes. Can you test again just to make sure it still works ?
>
> Basically, here's what I did:
>
> on dwc3_gadget_start:
>
> - __dwc3_gadget_start(dwc);
> + if (pm_runtime_active(dwc->dev))
> + __dwc3_gadget_start(dwc);
> +
Great.
>
> on run_stop, I kept the same thing.
>
> you just need to replace "usb: dwc3: implement runtime PM" with the new
> version from my branch.
Yeah, it can work well on my platform with your new patch.
>
> cheers
>
> --
> balbi
--
Baolin.wang
Best Regards
