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

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Message-ID: <2e068eea-605c-3f7f-904f-2a1d7279879f@synopsys.com>
Date:   Thu, 11 Feb 2021 11:21:15 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     Ruslan Bilovol <ruslan.bilovol@...il.com>,
        Linux USB <linux-usb@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: RPi4 DWC2 gadget doesn't copy data to a buffer in ep0 SETUP +
 DATA OUT transaction

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