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Date: Sun, 13 Nov 2022 19:35:39 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Ai Chao <aichao@...inos.cn>
Cc: laurent.pinchart@...asonboard.com, mchehab@...nel.org,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: uvcvideo: Fix bandwidth error for Alcor camera
Hi Ai
Thanks for your patch. Can you take a look to the other comments from
my previous email?
Also next time, please add v2, v3.. to your subject, to make it easier
to follow the status of the patch.
Thanks!
On Sat, 12 Nov 2022 at 02:28, Ai Chao <aichao@...inos.cn> wrote:
>
> For Alcor Corp. Slave camera(1b17:6684), it support to
> output compressed video data, and it return a wrong
> dwMaxPayloadTransferSize fields. This is a fireware issue,
> but the manufacturer cannot provide a const return fields
> by the fireware. so we check the dwMaxPayloadTransferSize fields,
> if it large than 0x1000, reset dwMaxPayloadTransferSize to 1024.
>
> lsusb -d 1b17:6684 -v
>
> Bus 001 Device 007: ID 1b17:6684 Alcor Corp. Slave camera
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 2.00
> bDeviceClass 239 Miscellaneous Device
> bDeviceSubClass 2
> bDeviceProtocol 1 Interface Association
> bMaxPacketSize0 64
> idVendor 0x1b17
> idProduct 0x6684
> bcdDevice 1.01
> iManufacturer 1 Alcor Corp.
> iProduct 2 Slave camera
> iSerial 0
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 0x0443
> bNumInterfaces 2
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0x80
> (Bus Powered)
> MaxPower 200mA
> Interface Association:
> bLength 8
> bDescriptorType 11
> bFirstInterface 0
> bInterfaceCount 2
> bFunctionClass 14 Video
> bFunctionSubClass 3 Video Interface Collection
> bFunctionProtocol 0
> iFunction 4 Slave camera
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 1
> bInterfaceClass 14 Video
> bInterfaceSubClass 1 Video Control
> bInterfaceProtocol 0
> iInterface 4 Slave camera
> VideoControl Interface Descriptor:
> bLength 13
> bDescriptorType 36
> bDescriptorSubtype 1 (HEADER)
> bcdUVC 1.00
> wTotalLength 0x004f
> dwClockFrequency 30.000000MHz
> bInCollection 1
> baInterfaceNr( 0) 1
> VideoControl Interface Descriptor:
> bLength 28
> bDescriptorType 36
> bDescriptorSubtype 6 (EXTENSION_UNIT)
> bUnitID 6
> guidExtensionCode {68bbd0b0-61a4-4b83-90b7-a6215f3c4f70}
> bNumControl 24
> bNrPins 1
> baSourceID( 0) 2
> bControlSize 3
> bmControls( 0) 0xff
> bmControls( 1) 0xff
> bmControls( 2) 0xff
> iExtension 0
> 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 0x0000000e
> Auto-Exposure Mode
> Auto-Exposure Priority
> Exposure Time (Absolute)
> VideoControl Interface Descriptor:
> bLength 11
> bDescriptorType 36
> bDescriptorSubtype 5 (PROCESSING_UNIT)
> Warning: Descriptor too short
> bUnitID 2
> bSourceID 1
> wMaxMultiplier 0
> bControlSize 2
> bmControls 0x0000177f
> Brightness
> Contrast
> Hue
> Saturation
> Sharpness
> Gamma
> White Balance Temperature
> Backlight Compensation
> Gain
> Power Line Frequency
> White Balance Temperature, Auto
> iProcessing 0
> bmVideoStandards 0x09
> None
> SECAM - 625/50
> VideoControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 3 (OUTPUT_TERMINAL)
> bTerminalID 3
> wTerminalType 0x0101 USB Streaming
> bAssocTerminal 0
> bSourceID 2
> 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 0x0010 1x 16 bytes
> bInterval 7
> 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 15
> bDescriptorType 36
> bDescriptorSubtype 1 (INPUT_HEADER)
> bNumFormats 2
> wTotalLength 0x0385
> bEndPointAddress 130
> bmInfo 0
> bTerminalLink 3
> bStillCaptureMethod 2
> bTriggerSupport 1
> bTriggerUsage 0
> bControlSize 1
> bmaControls( 0) 0
> bmaControls( 1) 0
> VideoStreaming Interface Descriptor:
> bLength 11
> bDescriptorType 36
> bDescriptorSubtype 6 (FORMAT_MJPEG)
> bFormatIndex 1
> bNumFrameDescriptors 9
> bFlags 1
> Fixed-size samples: Yes
> bDefaultFrameIndex 1
> bAspectRatioX 0
> bAspectRatioY 0
> bmInterlaceFlags 0x00
> Interlaced stream or variable: No
> Fields per frame: 1 fields
> Field 1 first: No
> Field pattern: Field 1 only
> bCopyProtect 0
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 1
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1080
> dwMinBitRate 248832000
> dwMaxBitRate 1492992000
> dwMaxVideoFrameBufferSize 6220800
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 2
> bmCapabilities 0x00
> Still image unsupported
> wWidth 2048
> wHeight 1536
> dwMinBitRate 377487360
> dwMaxBitRate 2264924160
> dwMaxVideoFrameBufferSize 9437184
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 42
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 3
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1600
> wHeight 1200
> dwMinBitRate 230400000
> dwMaxBitRate 921600000
> dwMaxVideoFrameBufferSize 5760000
> dwDefaultFrameInterval 500000
> bFrameIntervalType 4
> dwFrameInterval( 0) 500000
> dwFrameInterval( 1) 666666
> dwFrameInterval( 2) 1000000
> dwFrameInterval( 3) 2000000
> VideoStreaming Interface Descriptor:
> bLength 38
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 4
> bmCapabilities 0x00
> Still image unsupported
> wWidth 2592
> wHeight 1944
> dwMinBitRate 604661760
> dwMaxBitRate 1813985280
> dwMaxVideoFrameBufferSize 15116544
> dwDefaultFrameInterval 666666
> bFrameIntervalType 3
> dwFrameInterval( 0) 666666
> dwFrameInterval( 1) 1000000
> dwFrameInterval( 2) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 5
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 1024
> dwMinBitRate 157286400
> dwMaxBitRate 943718400
> dwMaxVideoFrameBufferSize 3932160
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 42
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 6
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 960
> dwMinBitRate 147456000
> dwMaxBitRate 589824000
> dwMaxVideoFrameBufferSize 3686400
> dwDefaultFrameInterval 500000
> bFrameIntervalType 4
> dwFrameInterval( 0) 500000
> dwFrameInterval( 1) 666666
> dwFrameInterval( 2) 1000000
> dwFrameInterval( 3) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 7
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 720
> dwMinBitRate 110592000
> dwMaxBitRate 663552000
> dwMaxVideoFrameBufferSize 2764800
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 8
> bmCapabilities 0x00
> Still image unsupported
> wWidth 800
> wHeight 600
> dwMinBitRate 57600000
> dwMaxBitRate 345600000
> dwMaxVideoFrameBufferSize 1440000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 9
> bmCapabilities 0x00
> Still image unsupported
> wWidth 640
> wHeight 480
> dwMinBitRate 36864000
> dwMaxBitRate 221184000
> dwMaxVideoFrameBufferSize 921600
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 42
> bDescriptorType 36
> bDescriptorSubtype 3 (STILL_IMAGE_FRAME)
> bEndpointAddress 0
> bNumImageSizePatterns 9
> wWidth( 0) 1920
> wHeight( 0) 1080
> wWidth( 1) 2048
> wHeight( 1) 1536
> wWidth( 2) 1600
> wHeight( 2) 1200
> wWidth( 3) 2592
> wHeight( 3) 1944
> wWidth( 4) 1280
> wHeight( 4) 1024
> wWidth( 5) 1280
> wHeight( 5) 960
> wWidth( 6) 1280
> wHeight( 6) 720
> wWidth( 7) 800
> wHeight( 7) 600
> wWidth( 8) 640
> wHeight( 8) 480
> bNumCompressionPatterns 0
> 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 9
> guidFormat {32595559-0000-0010-8000-00aa00389b71}
> 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 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1080
> dwMinBitRate 165888000
> dwMaxBitRate 165888000
> dwMaxVideoFrameBufferSize 4147200
> dwDefaultFrameInterval 2000000
> bFrameIntervalType 1
> dwFrameInterval( 0) 2000000
> VideoStreaming Interface Descriptor:
> bLength 42
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 2
> bmCapabilities 0x00
> Still image unsupported
> wWidth 2048
> wHeight 1536
> dwMinBitRate 251658240
> dwMaxBitRate 1006632960
> dwMaxVideoFrameBufferSize 6291456
> dwDefaultFrameInterval 500000
> bFrameIntervalType 4
> dwFrameInterval( 0) 500000
> dwFrameInterval( 1) 666666
> dwFrameInterval( 2) 1000000
> dwFrameInterval( 3) 2000000
> VideoStreaming Interface Descriptor:
> bLength 30
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 3
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1600
> wHeight 1200
> dwMinBitRate 153600000
> dwMaxBitRate 153600000
> dwMaxVideoFrameBufferSize 3840000
> dwDefaultFrameInterval 2000000
> bFrameIntervalType 1
> dwFrameInterval( 0) 2000000
> VideoStreaming Interface Descriptor:
> bLength 30
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 4
> bmCapabilities 0x00
> Still image unsupported
> wWidth 2592
> wHeight 1944
> dwMinBitRate 161243136
> dwMaxBitRate 161243136
> dwMaxVideoFrameBufferSize 10077696
> dwDefaultFrameInterval 5000000
> bFrameIntervalType 1
> dwFrameInterval( 0) 5000000
> VideoStreaming Interface Descriptor:
> bLength 34
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 5
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 1024
> dwMinBitRate 104857600
> dwMaxBitRate 167772160
> dwMaxVideoFrameBufferSize 2621440
> dwDefaultFrameInterval 1250000
> bFrameIntervalType 2
> dwFrameInterval( 0) 1250000
> dwFrameInterval( 1) 2000000
> VideoStreaming Interface Descriptor:
> bLength 30
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 6
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 960
> dwMinBitRate 98304000
> dwMaxBitRate 98304000
> dwMaxVideoFrameBufferSize 2457600
> dwDefaultFrameInterval 2000000
> bFrameIntervalType 1
> dwFrameInterval( 0) 2000000
> VideoStreaming Interface Descriptor:
> bLength 34
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 7
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 720
> dwMinBitRate 73728000
> dwMaxBitRate 147456000
> dwMaxVideoFrameBufferSize 1843200
> dwDefaultFrameInterval 1000000
> bFrameIntervalType 2
> dwFrameInterval( 0) 1000000
> dwFrameInterval( 1) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 8
> bmCapabilities 0x00
> Still image unsupported
> wWidth 800
> wHeight 600
> dwMinBitRate 38400000
> dwMaxBitRate 230400000
> dwMaxVideoFrameBufferSize 960000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 9
> bmCapabilities 0x00
> Still image unsupported
> wWidth 640
> wHeight 480
> dwMinBitRate 24576000
> dwMaxBitRate 147456000
> dwMaxVideoFrameBufferSize 614400
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 500000
> dwFrameInterval( 3) 666666
> dwFrameInterval( 4) 1000000
> dwFrameInterval( 5) 2000000
> VideoStreaming Interface Descriptor:
> bLength 42
> bDescriptorType 36
> bDescriptorSubtype 3 (STILL_IMAGE_FRAME)
> bEndpointAddress 0
> bNumImageSizePatterns 9
> wWidth( 0) 1920
> wHeight( 0) 1080
> wWidth( 1) 2048
> wHeight( 1) 1536
> wWidth( 2) 1600
> wHeight( 2) 1200
> wWidth( 3) 2592
> wHeight( 3) 1944
> wWidth( 4) 1280
> wHeight( 4) 1024
> wWidth( 5) 1280
> wHeight( 5) 960
> wWidth( 6) 1280
> wHeight( 6) 720
> wWidth( 7) 800
> wHeight( 7) 600
> wWidth( 8) 640
> wHeight( 8) 480
> bNumCompressionPatterns 0
> 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 0x82 EP 2 IN
> bmAttributes 5
> Transfer Type Isochronous
> Synch Type Asynchronous
> Usage Type Data
> wMaxPacketSize 0x1400 3x 1024 bytes
> bInterval 1
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 2
> 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 0x1340 3x 832 bytes
> bInterval 1
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 3
> 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 0x0c00 2x 1024 bytes
> bInterval 1
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 4
> 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 0x0c00 2x 1024 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)
>
> Signed-off-by: Ai Chao <aichao@...inos.cn>
> ---
> drivers/media/usb/uvc/uvc_video.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> index d2eb9066e4dc..49226c3f423c 100644
> --- a/drivers/media/usb/uvc/uvc_video.c
> +++ b/drivers/media/usb/uvc/uvc_video.c
> @@ -234,6 +234,14 @@ static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
>
> ctrl->dwMaxPayloadTransferSize = bandwidth;
> }
> +
> + /*Alcor Corp. Slave camera return wrong dwMaxPayloadTransferSize*/
> + if ((format->flags & UVC_FMT_FLAG_COMPRESSED) &&
> + (ctrl->dwMaxPayloadTransferSize > 0x1000) &&
> + (le16_to_cpu(stream->dev->udev->descriptor.idVendor) == 0x1b17) &&
> + (le16_to_cpu(stream->dev->udev->descriptor.idProduct) == 0x6684)) {
> + ctrl->dwMaxPayloadTransferSize = 1024;
> + }
> }
>
> static size_t uvc_video_ctrl_size(struct uvc_streaming *stream)
> --
> 2.25.1
>
--
Ricardo Ribalda
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