Hi Roger,
(CCin'g Alan Stern and linux-usb)
On Wed, Jan 01, 2020 at 05:52:27PM +0000, Roger Whittaker wrote:
> On Wed, Jan 01, 2020 at 07:24:49PM +0200, Laurent Pinchart wrote:
>
> > The last message is worse. Could you send me the output of lsusb -v (you
> > can restrict it to the camera with -d), if possible running as root, for
> > both the working and non-working kernels ?
>
> Thanks very much for your reply.
>
> The lsusb outputs are attached - they are in fact identical to each
> other.
>
> Also attached, the dmesg lines when replugging the camera on both
> kernels.
Thank you for the information.
I had missed the following message:
[ 470.351700] usb 1-1.4.3.1: config 1 interface 2 altsetting 0 endpoint 0x82 has wMaxPacketSize 0, skipping
This seems to be the culprit, and it points to the USB core. One
interface is ignored due to its wMaxPacketSize value, and the uvcvideo
driver then fails to find it.
The wMaxPacketSize check was added in
commit d482c7bb0541d19dea8bff437a9f3c5563b5b2d2
Author: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Mon Oct 28 10:52:35 2019 -0400
USB: Skip endpoints with 0 maxpacket length
Endpoints with a maxpacket length of 0 are probably useless. They
can't transfer any data, and it's not at all unlikely that an HCD will
crash or hang when trying to handle an URB for such an endpoint.
Currently the USB core does not check for endpoints having a maxpacket
value of 0. This patch adds a check, printing a warning and skipping
over any endpoints it catches.
Now, the USB spec does not rule out endpoints having maxpacket = 0.
But since they wouldn't have any practical use, there doesn't seem to
be any good reason for us to accept them.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/Pine.LNX.4.44L0.1910281050420.1485-100000@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
The commit was merged in v5.4 and backported to v5.3.11 in
47aaab6377204cdbcd16f52a23c584f994fd0d15.
For reference for Alan and linux-usb, the issue being discussed is
described in https://bugzilla.suse.com/show_bug.cgi?id=1159811. The
above commit seems to cause a regression with several cameras. I've
attached to this e-mail the lsusb output provided by Roger.
--
Regards,
Laurent Pinchart
Bus 001 Device 010: ID 1778:0214
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x1778
idProduct 0x0214
bcdDevice 7.07
iManufacturer 1 IPEVO Inc.
iProduct 2 IPEVO Point 2 View
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0299
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 64
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 1
bInterfaceCount 2
bFunctionClass 14 Video
bFunctionSubClass 3 Video Interface Collection
bFunctionProtocol 0
iFunction 2 IPEVO Point 2 View
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 2 IPEVO Point 2 View
VideoControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdUVC 1.00
wTotalLength 0x0050
dwClockFrequency 6.000000MHz
bInCollection 1
baInterfaceNr( 0) 2
VideoControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Camera Sensor
bAssocTerminal 0
iTerminal 0
wObjectiveFocalLengthMin 0
wObjectiveFocalLengthMax 0
wOcularFocalLength 0
bControlSize 3
bmControls 0x000200a2
Auto-Exposure Mode
Focus (Absolute)
Iris (Absolute)
Focus, Auto
VideoControl Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 5 (PROCESSING_UNIT)
Warning: Descriptor too short
bUnitID 3
bSourceID 1
wMaxMultiplier 0
bControlSize 2
bmControls 0x0000147f
Brightness
Contrast
Hue
Saturation
Sharpness
Gamma
White Balance Temperature
Power Line Frequency
White Balance Temperature, Auto
iProcessing 0
bmVideoStandards 0x1d
None
PAL - 625/50
SECAM - 625/50
NTSC - 625/50
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 4
guidExtensionCode {5a215226-3289-4156-894a-5c557cdf9664}
bNumControl 4
bNrPins 1
baSourceID( 0) 3
bControlSize 4
bmControls( 0) 0xff
bmControls( 1) 0xff
bmControls( 2) 0xff
bmControls( 3) 0xff
iExtension 0
VideoControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 2
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 4
iTerminal 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 9
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0000 1x 0 bytes
bInterval 1
INTERFACE CLASS: 0f 24 01 02 ea 01 82 00 02 02 01 00 01 00 00
INTERFACE CLASS: 1b 24 04 01 07 59 55 59 32 00 00 10 00 80 00 00 aa 00 38 9b 71 10 01 00 00 00 00
INTERFACE CLASS: 1e 24 05 01 00 80 02 e0 01 00 00 0d 2f 00 00 0d 2f 00 60 09 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 05 02 00 40 01 f0 00 c0 00 03 4b c0 00 03 4b 00 58 02 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 05 03 00 20 03 58 02 70 00 14 99 70 00 14 99 00 a6 0e 00 9a 5b 06 00 01 9a 5b 06 00
INTERFACE CLASS: 1e 24 05 04 00 00 04 00 03 00 00 16 80 00 00 16 80 00 00 18 00 2a 2c 0a 00 01 2a 2c 0a 00
INTERFACE CLASS: 1e 24 05 05 00 00 05 00 04 00 00 12 c0 00 00 12 c0 00 00 28 00 d0 12 13 00 01 d0 12 13 00
INTERFACE CLASS: 1e 24 05 06 00 40 06 b0 04 00 00 0e a6 00 00 0e a6 00 98 3a 00 a0 25 26 00 01 a0 25 26 00
INTERFACE CLASS: 1e 24 05 01 00 80 02 e0 01 00 00 0d 2f 00 00 0d 2f 00 60 09 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 0b 24 03 00 01 80 02 e0 01 01 00
INTERFACE CLASS: 0b 24 06 02 07 00 01 00 00 00 00
INTERFACE CLASS: 1e 24 07 01 00 80 02 e0 01 00 00 0d 2f 00 00 0d 2f 00 60 09 00 0e 64 03 00 01 0e 64 03 00
INTERFACE CLASS: 1e 24 07 02 00 40 01 f0 00 c0 00 03 4b c0 00 03 4b 00 58 02 00 0e 64 03 00 01 0e 64 03 00
INTERFACE CLASS: 1e 24 07 03 00 20 03 58 02 70 00 14 99 70 00 14 99 00 a6 0e 00 0e 64 03 00 01 0e 64 03 00
INTERFACE CLASS: 1e 24 07 04 00 00 04 00 03 00 00 16 80 00 00 16 80 00 00 18 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 07 05 00 00 05 00 04 00 00 12 c0 00 00 12 c0 00 00 28 00 2a 2c 0a 00 01 2a 2c 0a 00
INTERFACE CLASS: 1e 24 07 06 00 40 06 b0 04 00 00 0e a6 00 00 0e a6 00 98 3a 00 d0 12 13 00 01 d0 12 13 00
INTERFACE CLASS: 1e 24 07 01 00 80 02 e0 01 00 00 0d 2f 00 00 0d 2f 00 60 09 00 0e 64 03 00 01 0e 64 03 00
INTERFACE CLASS: 06 24 0d 00 00 00
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x13fc 3x 1020 bytes
bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
