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/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
