can not receive xfer interrupt after stop xfer is called intel XHCI Gemini Lake SOC

[Hans Petter Selasky]

On 2019-12-31 11:53, Hans Petter Selasky wrote:
> On 2019-12-31 01:23, Shichun.Ma at dell.com wrote:
>> Dell Customer Communication - Confidential
>>
>> Hi HPS,
>>
>> It's already in stopped status. I am also confusing on the root cause.
>> I attached the test application and my patch for the xhci stop xfer 
>> workaround solution.
>> The confusing points:
>> 1. cancel xfer error can be reproduced on all CCID smart readers (I 
>> have tested three different model of readers);
>> 2. keyboard has similar endpoint attribution, while I can't reproduce 
>> similar problem on the keyboard;
>>
> 
> Hi,
> 
> I suspect it is the newer XHCI hardware which has some additional 
> checks. Can you verify if the XHCI controller in your computer accept 
> multiple configure_ep() commands? The state diagram in the XHCI 
> specification does not say you cannot do this, but I imagine this might 
> be causing it.
> 
> The XHCI driver in FreeBSD configure one and one endpoint and not all at 
> the same time.
> 
> Can you try the attached patch instead of yours?
> 

Ping?

--HPS