On 18 May 2016 at 19:21, Felipe Balbi <balbi@xxxxxxxxxx> wrote:
>
> Hi,
>
> Baolin Wang <baolin.wang@xxxxxxxxxx> writes:
>>>>>> @@ -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.
>
> cool, thanks again :-) I'll drop my "not for merging note" and add your
> "Tested-by" (assuming it's okay for you that I do it).
It's okay for me. Thanks.
>
> cheers
>
> --
> balbi
--
Baolin.wang
Best Regards
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