Re: RPi4 DWC2 gadget doesn't copy data to a buffer in ep0 SETUP + DATA OUT transaction

[Minas Harutyunyan]

Hi Ruslan,

On 2/1/2021 3:44 AM, Ruslan Bilovol wrote:
> Hi Minas and other USB experts,
> 
> I'm currently developing new features for UAC1/UAC2 audio gadgets
> like Volume/Mute controls which use Control SETUP + DATA OUT
> transactions through ep0.
> 
> While it works fine on BeagleBone black board with MUSB UDC,
> on Raspberry Pi 4 with DWC2 UDC there is an issue.
> 
> I found that when DWC2 receives ep0 SETUP + DATA OUT transaction,
> it doesn't copy data transferred from the host to EP0 in DATA OUT stage
> to the usb_request->buf buffer. This buffer contains unchanged data from
> previous transactions.
> 

Could you please send debug log with issue and usb trace.

Thanks,
Minas