Hi,
I'm no longer able to use g_webcam with uvc-gadget [1] since v4.9. Logs at the
end.
It looks like we're goofing up on the control endpoint.
If I revert the following commit everything works fine.
commit 4fbac5206afd01b717d4bdc58793d471f3391b4b
Author: Petr Cvek <petr.c...@tul.cz>
Date: Wed Aug 17 12:36:57 2016 +0200
usb: gadget: uvc: Add missing call for additional setup data
Am I missing something on uvc-gadget side or is the commit really bad?
>From what I understand, uvc-gadget is responsible for sending response to
UVC class specific requests on control endpoint in uvc_send_response()
in uvc_v4l2.c.
So the reported commit is sending a duplicate response with probably
improper data.
[1] - git://git.ideasonboard.org/uvc-gadget.git
--
cheers,
-roger
Logs:
-----
#gadget side:
open succeeded, file descriptor = 3
device is dwc3-gadget on bus gadget
bRequestType a1 bRequest 87 wValue 0100 wIndex 0001 wLength 001a
streaming request (req 87 [UVC_GET_DEF], cs 01)
uvc_events_process: event 0x8000004, response length 34
bRequestType 21 bRequest 01 wValue 0100 wIndex 0001 wLength 001a
streaming request (req 01 [UVC_SET_CUR], cs 01)
uvc_events_process: event 0x8000004, response length 34
setting probe control, length = 26
bRequestType a1 bRequest 81 wValue 0100 wIndex 0001 wLength 001a
streaming request (req 81 [UVC_GET_CUR], cs 01)
uvc_events_process: event 0x8000004, response length 34
#Host side
[27398.977099] usb 2-1.2: new high-speed USB device number 54 using ehci-pci
[27399.072799] usb 2-1.2: New USB device found, idVendor=1d6b, idProduct=0102
[27399.072809] usb 2-1.2: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[27399.072814] usb 2-1.2: Product: Webcam gadget
[27399.072818] usb 2-1.2: Manufacturer: Linux Foundation
[27399.097437] uvcvideo: Found UVC 1.00 device Webcam gadget (1d6b:0102)
[27399.109341] input: Webcam gadget as
/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/input/input69
[27409.542335] uvcvideo: Failed to query (GET_DEF) UVC control 2 on unit 2:
-110 (exp. 2).
[27409.842264] uvcvideo: Failed to query (GET_DEF) UVC control 2 on unit 2:
-110 (exp. 2).
[27409.846363] uvcvideo: Failed to query (GET_DEF) UVC control 2 on unit 2: -71
(exp. 2).
[27409.850602] uvcvideo: Failed to query (GET_DEF) UVC control 2 on unit 2: -71
(exp. 2).
[27442.242779] usb 2-1.2: reset high-speed USB device number 54 using ehci-pci
[27442.326540] usb 2-1.2: device descriptor read/64, error -71
[27442.514512] usb 2-1.2: device descriptor read/64, error -71
[27442.690526] usb 2-1.2: reset high-speed USB device number 54 using ehci-pci
[27442.774509] usb 2-1.2: device descriptor read/64, error -71
[27442.962526] usb 2-1.2: device descriptor read/64, error -71
[27443.138490] usb 2-1.2: reset high-speed USB device number 54 using ehci-pci
[27443.554484] usb 2-1.2: device not accepting address 54, error -71
[27443.626516] usb 2-1.2: reset high-speed USB device number 54 using ehci-pci
[27444.042433] usb 2-1.2: device not accepting address 54, error -71
[27444.045025] usb 2-1.2: USB disconnect, device number 54
[27444.154454] usb 2-1.2: new high-speed USB device number 55 using ehci-pci
[27444.238442] usb 2-1.2: device descriptor read/64, error -71
[27444.426487] usb 2-1.2: device descriptor read/64, error -71
[27444.602429] usb 2-1.2: new high-speed USB device number 56 using ehci-pci
[27444.686421] usb 2-1.2: device descriptor read/64, error -71
[27444.874416] usb 2-1.2: device descriptor read/64, error -71
[27445.050419] usb 2-1.2: new high-speed USB device number 57 using ehci-pci
[27445.466363] usb 2-1.2: device not accepting address 57, error -71
[27445.538361] usb 2-1.2: new high-speed USB device number 58 using ehci-pci
[27445.954311] usb 2-1.2: device not accepting address 58, error -71
[27445.956294] usb 2-1-port2: unable to enumerate USB device
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