RE: xhci data toggle out of sync

Reply: Hans Petter Selasky : "Re: xhci data toggle out of sync"
In reply to: Hans Petter Selasky : "Re: xhci data toggle out of sync"
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From: Mahesh Vardhamanaiah <maheshmv_at_juniper.net>
Date: Wed, 20 Apr 2022 05:15:22 UTC

Hi HPS,

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

Thanks,
Mahesh

Juniper Business Use Only

-----Original Message-----
From: Hans Petter Selasky <hps@selasky.org> 
Sent: Wednesday, April 20, 2022 1:35 AM
To: Mahesh Vardhamanaiah <maheshmv@juniper.net>; Kamal Prasad <krprasad@juniper.net>; freebsd-usb@freebsd.org
Cc: Steve Kiernan <stevek@juniper.net>; Justin Hibbits <jhibbits@juniper.net>; Kumara N Babu <bkumara@juniper.net>; Kristof Provost <kp@FreeBSD.org>; Bjoern A. Zeeb <bz@FreeBSD.org>
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?

--HPS