Re: RK3288 dwc2 USB OTG + macOS

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Hi Jack,


On 8/30/2019 2:49 PM, Jack Mitchell wrote:
> On 22/08/2019 17:06, Jack Mitchell wrote:
>> I'm having issues on a Firefly rk3288 board when trying to use USB
>> gadget ethernet on macOS. The dr_mode is set to "otg" and it works fine
>> with my Linux desktop.
>>
>> If I set the dr_mode to "peripheral" macOS will work, but still takes
>> around 10 seconds to enumerate the device which makes me think it's only
>> just working. However, I need the port to be in "otg" mode as it will
>> switch between peripheral/host use cases.
>>
>> I've attached a log from the dwc2 driver from mainline Linux 5.2 when
>> being plugged into the macOS device for 30 seconds, then removed. The
>> mac in this case is a 2013 macbook pro. Any pointers in the right
>> direction would be greatly appreciated.
>>
>> Regards,
>> Jack.
>>
Sorry, for late response.

Could you please apply recently submitted patch "[PATCH] usb: dwc2: Fix 
SET/CLEAR_FEATURE and GET_STATUS flows" and test again.

> 
> I've been poking about with this some more and I've managed to bisect
> the issue down to the following commit
> 
> 729cac693eecfebdb9e152eaddddd358ae2decb7 usb: dwc2: Change ISOC DDMA flow
> 
> If I build before this commit everything works fine with a g_ether
> gadget device on mac. Unfortunately it's a rather large change which I
> can't just revert in master as it's got multiple dependant commits
> later. So, any advice on what could be causing this or how to help debug
> it would be much appreciated, as at the moment I've just forward ported
> the working 4.16 version of the driver over the 5.3-rc6 broken driver
> which isn't very sustainable in the long run.

I don't think that issue root cause coming from mentioned by you above 
patch. Based on log you provided, SET_FEATURE control transfer not 
completed by gadget - ZLP on status stage not sent to host.

> 
> Regards,
> Jack.
> 




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