Re: [PATCH 0/1] Add version check for setting ForceRM

[Elson Serrao]

On 8/6/2026 5:19 PM, Thinh Nguyen wrote:
> On Thu, Aug 06, 2026, Elson Serrao wrote:
>> Hi Thinh,
>>  
>> We are observing an issue on DWC_usb31 v2.00a and v2.10a controllers where
>> a transfer aborted through the ep_dequeue() path continues to generate
>> writes even after EndTransfer has completed. In our testing, the issue was

[...]
>> Thanks,
>> Elson
>>
>> Elson Serrao (1):
>>   usb: dwc3: gadget: add version check for setting ForceRM
>>
>>  drivers/usb/dwc3/gadget.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> -- 
>> 2.34.1
>>
> 
> Hi Elson,
> 
> Thanks for the patch.
> 
> This new recommendation applies to all 3.2 controllers also.
> 
> I don't recall forceRM=0 causing any issue to previous versions.
> 
> I would suggest applying this change across all IPs and IP versions to
> keep consistent behavior when ending transfers since TRBs are updated on
> completion. Since older IP databooks recommended setting forceRM=1, can
> you also add a note in the code indicating newer programming guideline
> revisions now recommend forceRM=0?
> 

Hi Thinh,

Thanks for the clarification.

Since forceRM should now always be 0, and the reset value of forceRM is
already 0, the  function parameter force=false effectively becomes a
no-op. Would you recommend we drop the 'bool force' argument from stop
active transfers API entirely (documenting the forceRM behavior in a
comment)? 
Or would you prefer we keep the parameter and just have all callers pass
'false' , so the API/framework stays in place in case a future IP/version
needs it again?

Let me know which approach you'd prefer and I'll send an updated patch.

Thanks,
Elson