Re: [PATCH] usb: gadget: function: acm: return zlp for OUT setup

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On Wed, Oct 14, 2015 at 8:42 PM, Felipe Balbi <balbi@xxxxxx> wrote:
>
> Hi,
>
> jaswinder.singh@xxxxxxxxxx writes:
>> From: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
>>
>> We must return 0 for any OUT setup request, otherwise
>> protocol error may occur.
>
> have you seen any such errors ?
>
Yes. While testing my new udc driver.


> Care to describe what problems you have seen and which UDC you were using,
> what's the exact scenario. How have you tested this ?
>
The udc I am writing the driver for is not yet public. To test my
driver at lowest level possible, I use 'usbmon' to capture and analyze
traffic since I don't have any hardware probe.

I see the following on gadget side
-------
configfs-gadget gadget: non-core control req21.20 v0000 i0001 l7
configfs-gadget gadget: acm ttyGS0 req21.20 v0000 i0001 l7
configfs-gadget gadget: acm ttyGS0 completion, err -71
-------

and the following on host side usbmon capture
-------
ffff88041ed01f00 540296433 S Co:3:023:0 s 21 20 0000 0001 0007 7 =
80250000 000008
ffff88041ed01f00 540296790 C Co:3:023:0 -71 0
-------

Thanks.
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