linux-kernel - usb data toggle reset in xhci_endpoint

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Message-ID: <05404e0c-a551-11f7-ed1b-785afd16e3f6@secunet.com>
Date:   Wed, 28 Jun 2017 15:17:58 +0200
From:   Dennis Wassenberg <dennis.wassenberg@...unet.com>
To:     <mathias.nyman@...el.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: usb data toggle reset in xhci_endpoint_reset

Hi all,

I have a question regarding the usb data toggle reset patch at https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git/log/?h=ep_reset_halt_test

I know that it is just experimental. Now I am in the situation that I need exactly this data toggle reset. I want to flash a radio unit via VBox using XHCI emulation. The radio unit itself is USB 2.0 connected to the host via XHCI (no EHCI available at Lenovo T460s). I made some tests and in some cases it works pretty well. But in some situations I got the following errors:



[  307.703605] usb 2-2: new full-speed USB device number 8 using xhci_hcd
[  310.647551] usb 2-2: new full-speed USB device number 10 using xhci_hcd
[  310.818060] usb 2-2: New USB device found, idVendor=0cad, idProduct=9006
[  310.818065] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  310.818069] usb 2-2: Product: TETRA Radio
[  310.818071] usb 2-2: Manufacturer: Motorola Solutions, Inc.
[  310.819515] xhci_hcd 0000:00:14.0: Endpoint 0x1 ep reset callback called
[  310.819735] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 1
[  310.820200] xhci_hcd 0000:00:14.0: Endpoint 0x82 ep reset callback called
[  310.820417] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 4
[  310.821376] xhci_hcd 0000:00:14.0: Endpoint 0x3 ep reset callback called
[  310.821796] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 5
[  310.822262] xhci_hcd 0000:00:14.0: Endpoint 0x84 ep reset callback called
[  310.822453] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 8
[  357.882021] xhci_hcd 0000:00:14.0: Endpoint 0x1 ep reset callback called
[  357.882257] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 1
[  357.883463] xhci_hcd 0000:00:14.0: Endpoint 0x82 ep reset callback called
[  357.883698] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 4
[  358.163174] xhci_hcd 0000:00:14.0: Endpoint 0x1 ep reset callback called
[  358.163413] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 1
[  358.164459] xhci_hcd 0000:00:14.0: Endpoint 0x82 ep reset callback called
[  358.164694] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 4
[  363.740553] xhci_hcd 0000:00:14.0: Endpoint 0x1 ep reset callback called
[  363.740952] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 1
[  363.742442] xhci_hcd 0000:00:14.0: Endpoint 0x82 ep reset callback called
[  363.742667] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 4
[  363.759807] xhci_hcd 0000:00:14.0: Endpoint 0x3 ep reset callback called
[  363.760047] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 5
[  363.761298] xhci_hcd 0000:00:14.0: Endpoint 0x84 ep reset callback called
[  363.761422] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 8
[  366.364290] xhci_hcd 0000:00:14.0: Endpoint 0x1 ep reset callback called
[  366.364527] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 1
[  366.366071] xhci_hcd 0000:00:14.0: Endpoint 0x82 ep reset callback called
[  366.366296] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 4
[  367.364950] xhci_hcd 0000:00:14.0: Endpoint 0x1 ep reset callback called
[  367.365190] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 1
[  367.366608] xhci_hcd 0000:00:14.0: Endpoint 0x82 ep reset callback called
[  367.366828] xhci_hcd 0000:00:14.0: Reset toggle/seq for slot 11, ep_index: 4
[  368.426103] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1
[  368.426106] xhci_hcd 0000:00:14.0: Looking for event-dma 0000000308a8e000 trb-start 0000000308a8e020 trb-end 0000000308a8e020 seg-start 0000000308a8e000 seg-end 0000000308a8eff0
[  368.426379] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1
[  368.426381] xhci_hcd 0000:00:14.0: Looking for event-dma 0000000308a8e010 trb-start 0000000308a8e020 trb-end 0000000308a8e020 seg-start 0000000308a8e000 seg-end 0000000308a8eff0
[  375.608459] usb 2-2: USB disconnect, device number 10

Are there any hints what I can try or can somebody give me a hint whats wrong there?

Thank you & best regards,

Dennis