RE: xhci data toggle out of sync

From: Mahesh Vardhamanaiah <>
Date: Wed, 20 Apr 2022 05:15:22 UTC

The controller is from Broadcom (BCM56275 chip) so have created Support Request Case for the query below.


Juniper Business Use Only

-----Original Message-----
From: Hans Petter Selasky <> 
Sent: Wednesday, April 20, 2022 1:35 AM
To: Mahesh Vardhamanaiah <>; Kamal Prasad <>;
Cc: Steve Kiernan <>; Justin Hibbits <>; Kumara N Babu <>; Kristof Provost <>; Bjoern A. Zeeb <>
Subject: Re: xhci data toggle out of sync

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On 4/19/22 17:31, Mahesh Vardhamanaiah wrote:
> Hi HPS,
> Sorry, my knowledge on USB is very limited.  Is there any other way to 
> reset the data toggles if the state Transition is not allowed ?

Hi Mahesh,

I will check the XHCI specification again, but I'm afraid we'll need to workaround this on the software side. Do you have any contacts on the hardware/XHCI side, which can explain what commands actually reset the data toggle?