* Re: tvp5150: pxa27x-camera pxa27x-camera.0: Field type 9 unsupported.
2012-03-20 11:27 tvp5150: pxa27x-camera pxa27x-camera.0: Field type 9 unsupported Marco Cavallini
@ 2012-03-20 23:31 ` Guennadi Liakhovetski
0 siblings, 0 replies; 2+ messages in thread
From: Guennadi Liakhovetski @ 2012-03-20 23:31 UTC (permalink / raw)
To: Marco Cavallini; +Cc: linux-media, Marco Cavallini
Hi Marco
On Tue, 20 Mar 2012, Marco Cavallini wrote:
> Hello,
> I am trying to run a tvp5150 driver with a PXA270 based board
This would be an interesting task...
> I am using kernel version: Linux 2.6.35 armv5tel GNU/Linux
>
> I also did a test with kernel-3.2.5 without success.
Let's concentrate on 3.2.5.
> 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?
No
> - do I need to have V2L to get out an image from tvp5150?
You mean V4L2? Yes, the pxa_camera is a V4L2 driver (an soc-camera V4L2
driver, to be more precise, more about this later).
> - which settings are missing in this driver?
Not settings, but support for the V4L2_FIELD_INTERLACED_BT type - type 9
above. This type is currently not supported by the driver.
> - does anybody have seen a tvp5150 working with a PXA270 earlier?
Don't think so.
> # ./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.
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/
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