Hi,
Baolin Wang <baolin.wang@xxxxxxxxxx> 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);
+
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.
cheers
--
balbi
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