linux-kernel - Re: uvcvideo: Unknown video format,00000032-0002-0010-8000-00aa00389b71

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Date:   Tue, 20 Mar 2018 20:04:27 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Nicolas Dufresne <nicolas@...fresne.ca>
Cc:     Paul Menzel <pmenzel+linux-media@...gen.mpg.de>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        it+linux-media@...gen.mpg.de
Subject: Re: uvcvideo: Unknown video format,00000032-0002-0010-8000-00aa00389b71

Hi Nicolas,

On Tuesday, 20 March 2018 19:45:51 EET Nicolas Dufresne wrote:
> Le mardi 20 mars 2018 à 13:20 +0100, Paul Menzel a écrit :
> > Dear Linux folks,
> > 
> > 
> > On the Dell XPS 13 9370, Linux 4.16-rc6 outputs the messages below.
> > 
> > ```
> > [    2.338094] calling  uvc_init+0x0/0x1000 [uvcvideo] @ 295
> > [    2.338569] calling  iTCO_wdt_init_module+0x0/0x1000 [iTCO_wdt] @ 280
> > [    2.338570] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
> > [    2.338713] iTCO_wdt: Found a Intel PCH TCO device (Version=4,
> > TCOBASE=0x0400)
> > [    2.338755] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD
> > (0bda:58f4)
> > [    2.338827] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0)
> > [    2.338851] initcall iTCO_wdt_init_module+0x0/0x1000 [iTCO_wdt]
> > returned 0 after 271 usecs
> > [    2.340669] uvcvideo 1-5:1.0: Entity type for entity Extension 4 was
> > not initialized!
> > [    2.340670] uvcvideo 1-5:1.0: Entity type for entity Extension 7 was
> > not initialized!
> > [    2.340672] uvcvideo 1-5:1.0: Entity type for entity Processing 2 was
> > not initialized!
> > [    2.340673] uvcvideo 1-5:1.0: Entity type for entity Camera 1 was not
> > initialized!
> > [    2.340736] input: Integrated_Webcam_HD: Integrate as
> > /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/input/input9
> > [    2.341447] uvcvideo: Unknown video format
> > 00000032-0002-0010-8000-00aa00389b71
> 
> While the 0002 is suspicious, this is pretty close to a color format.
> I've recently come across of similar format using D3DFORMAT instead of
> GUID. According to the vendor*, this camera module includes an infrared
> camera (340x340), so I suspect this is to specify the format it
> outputs. A good guess to start with would be that this is
> D3DFMT_X8L8V8U8 (0x32).

Isn't 0x32 D3DFMT_L8, not D3DFMT_X8L8V8U8 ?

> To test it, you could map this
> V4L2_PIX_FMT_YUV32/xRGB and see if the driver is happy with the buffer
> size.

VideoStreaming Interface Descriptor:
        bLength                            30
        bDescriptorType                    36
        bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
        bFrameIndex                         1
        bmCapabilities                   0x00
          Still image unsupported
        wWidth                            340
        wHeight                           340
        dwMinBitRate                 55488000
        dwMaxBitRate                 55488000
        dwMaxVideoFrameBufferSize      115600
        dwDefaultFrameInterval         166666
        bFrameIntervalType                  1
        dwFrameInterval( 0)            166666

340*340 is 115600, so this should be a 8-bit format.

> Then render it to make sure it looks some image of some sort. A
> new format will need to be defined as this format is in the wrong
> order, and is ambiguous (it may mean AYUV or xYUV). I'm not sure if we
> need specific formats to differentiate infrared data from YUV images,
> need to be discussed.

If the format is indeed D3DFMT_L8, it should map to V4L2_PIX_FMT_GREY (8-bit 
luminance). I suspect the camera transmits a depth map though.

> *https://dustinweb.azureedge.net/media/338953/xps-13-9370.pdf
> 
> > [    2.341450] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD
> > (0bda:58f4)
> > [    2.343371] uvcvideo: Unable to create debugfs 1-2 directory.
> > [    2.343420] uvcvideo 1-5:1.2: Entity type for entity Extension 10 was
> > not initialized!
> > [    2.343422] uvcvideo 1-5:1.2: Entity type for entity Extension 12 was
> > not initialized!
> > [    2.343423] uvcvideo 1-5:1.2: Entity type for entity Processing 9 was
> > not initialized!
> > [    2.343424] uvcvideo 1-5:1.2: Entity type for entity Camera 11 was
> > not initialized!
> > [    2.343472] input: Integrated_Webcam_HD: Integrate as
> > /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/input/input10
> > [    2.343496] usbcore: registered new interface driver uvcvideo
> > [    2.343496] USB Video Class driver (1.1.1)
> > [    2.343501] initcall uvc_init+0x0/0x1000 [uvcvideo] returned 0 after
> > 5275 usecs
> > ```
> > 
> > Please tell me, what I can do to improve the situation.

-- 
Regards,

Laurent Pinchart