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

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Date:   Tue, 20 Mar 2018 13:45:51 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Paul Menzel <pmenzel+linux-media@...gen.mpg.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     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

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

*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.
> 
> 
> Kind regards,
> 
> Paul
> 
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