tvp5150: pxa27x-camera pxa27x-camera.0: Field type 9 unsupported.

Hello,
I am trying to run a tvp5150 driver with a PXA270 based board I am using kernel version: Linux 2.6.35 armv5tel GNU/Linux

I also did a test with kernel-3.2.5 without success.
I started playing with V4L2, and I've never used it, but I built v4l2-utils. The problem is something in pxa_camera_try_fmt() related to the settings causing the error "pxa27x-camera pxa27x-camera.0: Field type 9 unsupported."

[   30.005365] Linux video capture interface: v2.00
[   32.942234] *** PROBE tvp5151 ***
[   32.945573] tvp5150 0-003a: chip found @ 0x74 (pxa_i2c-i2c.0)
[   33.281105] pxa27x-camera pxa27x-camera.0: Limiting master clock to
26000000
[   33.288557] camera 0-0: Probing 0-0
[   33.292170] pxa27x-camera pxa27x-camera.0: PXA Camera driver attached
to camera 0
[   33.666535] *** PROBE tvp5151 ***
[   33.669865] tvp5150 0-005d: chip found @ 0xba (pxa_i2c-i2c.0)
[   33.811605] tvp5150 0-005d: tvp5150am1 detected.
[   33.999541] *** tvp5150_g_fmt
[   34.002776] pxa27x-camera pxa27x-camera.0: PXA Camera driver detached
from camera 0
[   34.447069] pxa27x-camera pxa27x-camera.0: PXA Camera driver attached
to camera 0
[   34.454755] *** tvp5150_try_fmt 2
[   34.458053] pxa27x-camera pxa27x-camera.0: Field type 9 unsupported.
[   34.464393] pxa27x-camera pxa27x-camera.0: PXA Camera driver detached

from camera 0

I am completely stuck at this, so I have some questions:
- is kernel version 2.6.35 good for using tvp5150 driver?
- do I need to have V2L to get out an image from tvp5150?
- which settings are missing in this driver?
- does anybody have seen a tvp5150 working with a PXA270 earlier?

# ./v4l2-ctl --all
[ 2195.222443] pxa27x-camera pxa27x-camera.0: PXA Camera driver attached
to camera 0
[ 2195.230247] *** tvp5150_try_fmt 2
[ 2195.234032] pxa27x-camera pxa27x-camera.0: Field type 9 unsupported.
[ 2195.240473] pxa27x-camera pxa27x-camera.0: PXA Camera driver detached
from camera 0
Failed to open /dev/video0: Invalid argument

Any hint would be greatly appreciated, if you need more details please ask.

TIA
--
Marco

Hi Marco

This would be an interesting task...

Let's concentrate on 3.2.5.

No

You mean V4L2? Yes, the pxa_camera is a V4L2 driver (an soc-camera V4L2 driver, to be more precise, more about this later).

Not settings, but support for the V4L2_FIELD_INTERLACED_BT type - type 9 above. This type is currently not supported by the driver.

Don't think so.

pxa_camera is an soc-camera driver, which means up to now it has only been used with sensor drivers, also originally written for the soc-camera framework. At least off the top of my head I cannot remember any reports about it being used with other sensor drivers - even less so without any modifications. The soc-camera framework has recently undergone a number of changes to make it compatible with other (v4l2-subdevice) drivers, and there have been several more or less successful attempts to use various combinations of soc-camera and generic drivers, but I'm not sure, whether any of them have been successful with unmodified mainline drivers.

So, in short, you need two things:

1. Teach the pxa-camera driver to work with the V4L2_FIELD_SEQ_TB interlacing type, because that's what the tvp5150 driver is sending. There's even a comment currently there:

	/* TODO: support interlaced at least in pass-through mode */

BTW, I don't understand why v4l2-ctl insists on using V4L2_FIELD_INTERLACED_BT, maybe there's a parameter to use a different type.
2. Verify, whether this combination is working, perform any additionally necessary modifications.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/