On Tue, Oct 1, 2019 at 12:19 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Tue, 1 Oct 2019, Tim Harvey wrote:
>
> > On Thu, Sep 26, 2019 at 3:47 PM Tim Harvey <tharvey@xxxxxxxxxxxxx> wrote:
> > >
> > > Greetings,
> > >
> > > I'm running into an issue with a USB UVC Full speed camera, the
> > > PureThermal2 [1] on an IMX6 based ARM board.
> > >
> > > What I find is that I get two video devices registered (the first one
> > > is the expected device, and I'm not clear what the 2nd one is). When I
> > > try to capture a single frame I get 'Failed to submit URB 0 (-28)'
> > > which historically has been due to a bandwidth issue. I encounter this
> > > on the IMX6 EHCI host as well as the OTG host when no other devices
> > > are connected (no hubs either). I've tested with both a 4.20 kernel
> > > and a 5.3 kernel.
> > >
> > > If I plug this device into another board I have based on an OcteonTX
> > > ARM64 cpu with a fairly modern 4.14 kernel and I find that a single
> > > video device gets registered and I can capture just fine.
> > >
> > > Here are some details:
> > > lsusb reports: 1e4e:0100 Cubeternet WebCam
> > >
> > > working system with 4.14 kernel hot-inserting the camera:
> > > [ 495.163276] usb 1-1.2: new full-speed USB device number 6 using xhci_hcd
> > > [ 495.291685] uvcvideo: Found UVC 1.00 device PureThermal (fw:v1.2.2)
> > > (1e4e:0100)
> > > [ 495.300543] input: PureThermal (fw:v1.2.2): PureTh as
> > > /devices/platform/soc@0/848000000000.pci/pci0000:00/0000:00:10.0/usb1/1-1/1-1.2/1-1.2:1.0/input/input1
> > > [ 496.731214] usb 1-1.2: USB disconnect, device number 6
> > > [ 496.987294] usb 1-1.2: new full-speed USB device number 7 using xhci_hcd
> > > [ 497.115683] uvcvideo: Found UVC 1.00 device PureThermal (fw:v1.2.2)
> > > (1e4e:0100)
> > > [ 497.124182] input: PureThermal (fw:v1.2.2): PureTh as
> > > /devices/platform/soc@0/848000000000.pci/pci0000:00/0000:00:10.0/usb1/1-1/1-1.2/1-1.2:1.0/input/input2
>
> ...
>
> > > I'm also not clear why the device enumerates then disconnects and
> > > enumerates again when plugged in but this happens on the system it
> > > works on as well and I've seen similar things with other devices.
>
> Perhaps some process opens the camera's device file, does something to
> cause the camera to disconnect and reconnect, but then doesn't close
> the file.
Alan,
I found that the '2 devices' is because of a kernel commit in 4.16
that adds support for UVC metadata: 088ead2 media: uvcvideo: Add a
metadata device node. I can comment out the call to
uvc_meta_register() and the 2nd device goes away but the first (and
only) v4l2 capture device still has the same issue.
>
> > I have found that if I enumerate the camera through a PCIe based XHCI
> > host controller it still registers the 2 v4l2 devices but in this case
> > I can capture fine. So it would appear that this has something to do
> > with the IMX6 ci_hdrc controller. The -ENOSPC is getting returned from
> > drivers/usb/host/ehci-sched.c:iso_stream_schedule()
> >
> > I feel perhaps this is something basic I don't understand regarding
> > USB URB scheduling but I don't get why it occurs on the IMX6 ci_hdrc
> > controller on not an XHCI controller.
>
> It's probably related to differences between the drivers. What shows
> up in /sys/kernel/debug/usb/devices with the camera plugged in?
>
Here's some more debugging including /sys/kernel/debug/usb/devices:
~# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 1e4e:0100 Cubeternet WebCam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
~# lsusb -d 1e4e:0100 -v
Bus 001 Device 002: ID 1e4e:0100 Cubeternet WebCam
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x1e4e Cubeternet
idProduct 0x0100 WebCam
bcdDevice 2.00
iManufacturer 1 GroupGets
iProduct 2 PureThermal (fw:v1.2.2)
iSerial 3 801f001c-5102-3038-3835-393400000000
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 685
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 14 Video
bFunctionSubClass 3 Video Interface Collection
bFunctionProtocol 0
iFunction 2 PureThermal (fw:v1.2.2)
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 0
VideoControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdUVC 1.00
wTotalLength 259
dwClockFrequency 6.000000MHz
bInCollection 1
baInterfaceNr( 0) 1
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 0x00000000
VideoControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 5 (PROCESSING_UNIT)
Warning: Descriptor too short
bUnitID 2
bSourceID 1
wMaxMultiplier 0
bControlSize 3
bmControls 0x00000003
Brightness
Contrast
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 3
guidExtensionCode {7074312d-6c65-702d-6167-632d30303030}
bNumControl 20
bNrPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0xff
bmControls( 1) 0xff
bmControls( 2) 0x0f
bmControls( 3) 0x00
iExtension 0
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 4
guidExtensionCode {7074312d-6c65-702d-6f65-6d2d30303030}
bNumControl 30
bNrPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0xbf
bmControls( 1) 0xff
bmControls( 2) 0xff
bmControls( 3) 0x7f
iExtension 0
VideoControl Interface Descriptor:
bLength 33
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 5
guidExtensionCode {7074312d-6c65-702d-7261-642d30303030}
bNumControl 48
bNrPins 1
baSourceID( 0) 2
bControlSize 8
bmControls( 0) 0xff
bmControls( 1) 0xff
bmControls( 2) 0xff
bmControls( 3) 0x81
bmControls( 4) 0xfc
bmControls( 5) 0xcf
bmControls( 6) 0xff
bmControls( 7) 0x03
iExtension 0
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 6
guidExtensionCode {7074312d-6c65-702d-7379-732d30303030}
bNumControl 23
bNrPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0xff
bmControls( 1) 0xff
bmControls( 2) 0x7f
bmControls( 3) 0x00
iExtension 0
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 7
guidExtensionCode {7074312d-6c65-702d-7669-642d30303030}
bNumControl 14
bNrPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0xff
bmControls( 1) 0x3f
bmControls( 2) 0x00
bmControls( 3) 0x00
iExtension 0
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 21
guidExtensionCode {7074312d-6c65-702d-7261-643230303030}
bNumControl 27
bNrPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0xf9
bmControls( 1) 0x9f
bmControls( 2) 0xff
bmControls( 3) 0x07
iExtension 0
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 254
guidExtensionCode {7074312d-6c65-702d-6375-737430303030}
bNumControl 6
bNrPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0x3f
bmControls( 1) 0x00
bmControls( 2) 0x00
bmControls( 3) 0x00
iExtension 0
VideoControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 255
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 3
iTerminal 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 32
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
VideoStreaming Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 1 (INPUT_HEADER)
bNumFormats 5
wTotalLength 363
bEndPointAddress 129
bmInfo 0
bTerminalLink 255
bStillCaptureMethod 1
bTriggerSupport 0
bTriggerUsage 0
bControlSize 1
bmaControls( 0) 27
bmaControls( 1) 27
bmaControls( 2) 27
bmaControls( 3) 27
bmaControls( 4) 27
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 1
bNumFrameDescriptors 1
guidFormat
{55595659-0000-1000-8000-00aa00389b71}
bBitsPerPixel 16
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x02
Still image unsupported
Fixed frame-rate
wWidth 160
wHeight 120
dwMinBitRate 2764800
dwMaxBitRate 2764800
dwMaxVideoFrameBufferSize 38400
dwDefaultFrameInterval 1111111
bFrameIntervalType 1
dwFrameInterval( 0) 1111111
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 2
bNumFrameDescriptors 2
guidFormat
{59313620-0000-1000-8000-00aa00389b71}
bBitsPerPixel 16
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x02
Still image unsupported
Fixed frame-rate
wWidth 160
wHeight 120
dwMinBitRate 2764800
dwMaxBitRate 2764800
dwMaxVideoFrameBufferSize 38400
dwDefaultFrameInterval 1111111
bFrameIntervalType 1
dwFrameInterval( 0) 1111111
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 2
bmCapabilities 0x02
Still image unsupported
Fixed frame-rate
wWidth 160
wHeight 122
dwMinBitRate 2810880
dwMaxBitRate 2810880
dwMaxVideoFrameBufferSize 39040
dwDefaultFrameInterval 1111111
bFrameIntervalType 1
dwFrameInterval( 0) 1111111
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 3
bNumFrameDescriptors 1
guidFormat
{59382020-0000-1000-8000-00aa00389b71}
bBitsPerPixel 8
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x02
Still image unsupported
Fixed frame-rate
wWidth 160
wHeight 120
dwMinBitRate 1382400
dwMaxBitRate 1382400
dwMaxVideoFrameBufferSize 19200
dwDefaultFrameInterval 1111111
bFrameIntervalType 1
dwFrameInterval( 0) 1111111
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 4
bNumFrameDescriptors 1
guidFormat
{52474250-0000-1000-8000-00aa00389b71}
bBitsPerPixel 16
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x02
Still image unsupported
Fixed frame-rate
wWidth 160
wHeight 120
dwMinBitRate 2764800
dwMaxBitRate 2764800
dwMaxVideoFrameBufferSize 38400
dwDefaultFrameInterval 1111111
bFrameIntervalType 1
dwFrameInterval( 0) 1111111
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 5
bNumFrameDescriptors 1
guidFormat
{7deb36e4-4f52-ce11-9f53-0020af0ba770}
bBitsPerPixel 24
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 30
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x02
Still image unsupported
Fixed frame-rate
wWidth 160
wHeight 120
dwMinBitRate 4147200
dwMaxBitRate 4147200
dwMaxVideoFrameBufferSize 57600
dwDefaultFrameInterval 1111111
bFrameIntervalType 1
dwFrameInterval( 0) 1111111
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03c2 1x 962 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
~# for i in $(ls -1d /sys/class/video4linux/video*); do echo $i:$(cat
$i/name); done
/sys/class/video4linux/video0:PureThermal (fw:v1.2.2): PureTh
/sys/class/video4linux/video1:ipu1_csi0 capture
/sys/class/video4linux/video2:ipu1_ic_prpenc capture
/sys/class/video4linux/video3:ipu1_ic_prpvf capture
/sys/class/video4linux/video4:ipu1_csi1 capture
/sys/class/video4linux/video5:ipu2_csi0 capture
/sys/class/video4linux/video6:ipu2_ic_prpenc capture
/sys/class/video4linux/video7:ipu2_ic_prpvf capture
/sys/class/video4linux/video8:ipu2_csi1 capture
/sys/class/video4linux/video9:ipu_ic_pp csc/scaler
~# v4l2-ctl --device /dev/video0 --stream-mmap --stream-to=x.raw
--stream-count=1
[ 82.433385] uvcvideo: uvc_v4l2_open
[ 82.449716] uvcvideo: uvc_v4l2_mmap
[ 82.453767] uvcvideo: uvc_v4l2_mmap
[ 82.457408] uvcvideo: uvc_v4l2_mmap
[ 82.460983] uvcvideo: uvc_v4l2_mmap
[ 82.466275] uvcvideo: Device requested 962 B/frame bandwidth.
[ 82.472579] uvcvideo: Selecting alternate setting 1 (962 B/frame bandwidth).
[ 82.485634] uvcvideo: Allocated 5 URB buffers of 32x962 bytes each.
[ 82.492431] ci_hdrc ci_hdrc.0: iso sched full 399d9fef
[ 82.497845] uvcvideo: Failed to submit URB 0 (-28).
VIDIOC_STREAMON: failed: No space left on device
[ 82.511215] uvcvideo: uvc_v4l2_release
~# cat /sys/kernel/debug/usb/devices
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 5.03
S: Manufacturer=Linux 5.3.0-00157-g651f7f9-dirty ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=ci_hdrc.0
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1e4e ProdID=0100 Rev= 2.00
S: Manufacturer=GroupGets
S: Product=PureThermal (fw:v1.2.2)
S: SerialNumber=801f001c-5102-3038-3835-393400000000
C:* #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=100mA
A: FirstIf#= 0 IfCount= 2 Cls=0e(video) Sub=03 Prot=00
I:* If#= 0 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=00 Driver=uvcvideo
E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=32ms
I:* If#= 1 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
I: If#= 1 Alt= 1 #EPs= 1 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
E: Ad=81(I) Atr=01(Isoc) MxPS= 962 Ivl=1ms
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 5.03
S: Manufacturer=Linux 5.3.0-00157-g651f7f9-dirty ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=ci_hdrc.1
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms
~# [ 224.159009] systemd-journald[278]: Sent WATCHDOG=1 notification.
v4l2-ctl --device /dev/video0 --all
[ 283.767759] uvcvideo: uvc_v4l2_open
Driver Info (not using libv4l2):
Driver name : uvcvideo
Car[ 283.777534] systemd-journald[278]: Sent WATCHDOG=1 notification.
d type : PureThermal (fw:v1.2[ 283.785714] uvcvideo: uvc_v4l2_release
.2): PureTh
Bus info : usb-ci_hdrc.0-1
Driver version: 5.3.0
Capabilities : 0x84A00001
Video Capture
Metadata Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
Width/Height : 160/120
Pixel Format : 'UYVY'
Field : None
Bytes per Line : 320
Size Image : 38400
Colorspace : sRGB
Transfer Function : Default (maps to sRGB)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Flags :
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 160, Height 120
Default : Left 0, Top 0, Width 160, Height 120
Pixel Aspect: 1/1
Selection: crop_default, Left 0, Top 0, Width 160, Height 120
Selection: crop_bounds, Left 0, Top 0, Width 160, Height 120
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 9.000 (9/1)
Read buffers : 0
brightness 0x00980900 (int) : min=0 max=255
step=1 default=128 value=128
contrast 0x00980901 (int) : min=0 max=255
step=1 default=128 value=128
So regardless of resolution/frame-size the device is requesting 962
byte USB frame bandwidth which should be just fine for USB full speed
in iso mode (max 1023). I'm not sure why the bandwidth reservation
fails.
Apparently the RaspberryPi 4 has this same issue:
https://github.com/raspberrypi/linux/issues/3136. The same thread
mentions that most USB full speed devices have fall-back endpoint
max-packet sizes that allow for reduced bandwidth reservations (but
this camera does not).
I get the same results regardless of CONFIG_USB_EHCI_TT_NEWSCHED enabled or not.
<snip>
>
> PS: These notices are completely inappropriate for a messages sent to a
> public mailing list. If adhered to strictly, they would prevent anyone
> from replying to your message.
>
sorry about the sig... IT department inserted that via our mail server
and I didn't realize it was in use. Problem resolved.
Tim
