Re: testing soc_camera with mt9m001 on pxa270

["Maik Steuer" <Maik.Steuer@gmx.de>]

-------- Original-Nachricht --------
> Datum: Fri, 28 Nov 2008 16:16:48 +0100 (CET)
> Von: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> An: Maik Steuer <Maik.Steuer@gmx.de>
> CC: video4linux-list@redhat.com, kernel@pengutronix.de
> Betreff: Re: testing soc_camera with mt9m001 on pxa270

> On Fri, 28 Nov 2008, Maik Steuer wrote:
> 
> > Hello,
> > 
> > I'm testing at the moment the capture interface with the soc-camera and 
> > mt9m001 driver.
> > 
> > I fixed all I2C routines to test without any connected camera like 
> > mt9m001, because we want to use another camera hardware as mt9m001.
> > 
> > To read out the capture buffer I use the example project capture.c from 
> > V4L2-API with mmap(). The ioctl (fd, VIDIOC_REQBUFS, &req) at the 
> > beginning of initialization fails.  I have debuged the most important 
> > parts of the driver (pxa_camera, soc_camera and mt9m001) but I can't 
> > find the mistake.
> > 
> > Any Idea?
> 
> Sorry, no. Without knowing what kernel version you're using, without 
> seeing your "fixes to all I2C routines" I don't think anyone would be able
> to tell you what the problem is. 

I'm using 2.6.27.7. The fixes are easy. The two functions reg_read() and reg_write() in mt9m001.c returns always with 0 and the included i2c_smbus_read_word_data() and i2c_smbus_write_word_data() were commented out. I set the MT9M001_CHIP_VERSION to 0x8431 and set the default data_width to 8. That's all. In the V4L2-API capture example I set the right color space (in this case V4L2_PIX_FMT_GREY).

> And anyway you wouldn't get too far 
> without a real camera - at best when the pxa will start capturing, it will
> timeout waiting for sync signals. Maybe you would be able to do this if 
> you switch to the slave mode, but beware, that this mode hasn't been 
> tested.
> 

The pxa doesn't start capturing. That's my target to test the capture interface. I don't know if there is an easier way to start capturing as with the capture example from V4L2-API.

> I would suggest you tell us what camera you are going to use, maybe 
> someone is already working on a driver for it. If not - you write a driver
> yourself and start working with a real hardware.
> 

At the moment the camera is only a FPGA which sends 8 Bit dummy data with hsync, vsync and pixclock. So I can change all necessary parameters for pxa requirements.

I throught that the ioctl (fd, VIDIOC_REQBUFS, &req) starts soc_camera_reqbufs() but it isn't so.

greets
Maik

> Thanks
> Guennadi
> 
> > 
> > 
> > Here is a short log, which functions were called:
> > 
> > [@Linux /opt]#./capture -m
> > soc_camera_open()
> > pxa_camera_add_device() !!!
> > camera 0-0: PXA Camera driver attached to camera 0
> > pxa_camera_activate() !!!
> > mt9m001_init() !
> > pxa_camera_add_device() ret !!!
> > pxa_camera_init_videobuf() !!!
> > soc_camera_querycap()
> > soc_camera_querycap() ret 0
> > soc_camera_cropcap()
> > soc_camera_s_crop()
> > mt9m001_set_fmt_cap() !
> > mt9m001_set_fmt_cap() ! ret 0
> > soc_camera_s_crop() ret 0
> > soc_camera_s_fmt_vid_cap()
> > soc_camera_try_fmt_vid_cap()
> > pxa_camera_try_bus_param() !!!
> > 	test_platform_param() !!!
> > buswidth 8 flags 3133
> > 	buswidth 8 flags 3197
> > mt9m001_query_bus_param() !
> > bus_switch_possible() !
> > width_flag 455
> > soc_camera_bus_param_compatible() ret 1109 !!!
> > mt9m001_try_fmt_cap() !
> > try_fmt__cap() ret 0
> > soc_camera_try_fmt_vid_cap() ret 0
> > mt9m001_set_fmt_cap() !
> > mt9m001_set_fmt_cap() ! ret 0
> > pxa_camera_set_bus_param()!!!
> > 	test_platform_param() !!!
> > buswidth 8 flags 3133
> > 	buswidth 8 flags 3197
> > mt9m001_query_bus_param()!
> > bus_switch_possible()!
> > width_flag 455
> > mt9m001_set_bus_param()!
> > flags 1109 datawidth 8 width_flags 64
> > pxa_camera_set_bus_param() ret 0 !!!
> > soc_camera_s_fmt_vid_cap() ret 0 
> > /dev/video does not support memory mapping
> > soc_camera_close()
> > camera 0-0: PXA Camera driver detached from camera 0
> > mt9m001_release() !
> > 
> > 
> > greets
> > 
> > Maik
> > -- 
> > Sensationsangebot nur bis 30.11: GMX FreeDSL - Telefonanschluss + DSL 
> > für nur 16,37 Euro/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K11308T4569a
> > 
> 
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer

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