Re: Issues with Empia + saa7115

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Em Wed, 29 Oct 2014 16:34:09 -0200
Rafael Coutinho <rafael.coutinho@xxxxxxxxxxxxxxxxxx> escreveu:

> Hi all,
> 
> I'm having trouble to make an SAA7115 (Actually it's the generic
> GM7113 version) video capture board to work on a beagle board running
> Android (4.0.3).
> For some reason I cannot capture any image, it always output a green image file.
> The kernel is Linux-3.2.0

Support for GM7113 were added only on a recent version.

So, you need to get a newer driver. So, you'll need to either upgrade
the Kernel, use either Linux backports or media-build to get a newer
driver set or do the manual work of backporting saa7115 and the bridge
driver changes for gm7113 for it to work.

Regards,
Mauro

> 
> My current approach is the simplest I have found so far, to avoid any
> issues with other sw layers. I'm forcing a 'dd' from the /dev/video
> device.
> 
> dd if=/dev/video0 of=ImageOut.raw bs=10065748 count=1
> 
> And then I open the raw image file converting it on an image editor.
> 
> In my ubuntu PC (kernel 3.13.0) it works fine. however on the Beagle
> Bone with android it fails to get an image.
> 
> I have now tried with a Linux (angstron) on beagle bone with 3.8
> kernel and this time is even worse, the 'dd' command does not result
> on any byte written on the output file.
> 
> The v4l2-ctl works fine on the 3 environments. I can even set values
> as standard, input etc...
> 
> I have attached the dmesg of the environments here:
> 
> * Android - dmesg http://pastebin.com/AFdB9N9c
> 
> * Linux Angstron - dmesg http://pastebin.com/s3S3iCph
> * Linux Angstron - lsmod http://pastebin.com/vh89TBKQ
> 
> * Desktop PC - dmesg http://pastebin.com/HXzHwnUJ
> 
> I have one restriction on the kernel of android due the HAL drivers
> for BBB. So changing kernel is not a choice.
> 
> Anyone could give me some tips on where to look for other issues or debug it?
> 
> Thanks in advance
> 
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