Hi Enric,
On Wednesday 19 January 2011 12:05:54 Enric Balletbà i Serra wrote:
> 2011/1/18 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>:
> > On Tuesday 18 January 2011 10:20:43 Enric Balletbà i Serra wrote:
> >> Now seems yavta is blocked dequeuing a buffer ( VIDIOC_DQBUF ), with
> >> strace I get
> >>
> >> $ strace ./yavta -f SGRBG10 -s 720x525 -n 1 --capture=1 -F /dev/video2
> >>
> >> mmap2(NULL, 756000, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0x4011f000
> >> write(1, "Buffer 0 mapped at address 0x401"..., 39Buffer 0 mapped at
> >> address 0x4011f000.
> >> ) = 39
> >> ioctl(3, VIDIOC_QBUF or VT_SETACTIVATE, 0xbede36cc) = 0
> >> ioctl(3, VIDIOC_STREAMON, 0xbede365c) = 0
> >> gettimeofday({10879, 920196}, NULL) = 0
> >> ioctl(3, VIDIOC_DQBUF
> >>
> >> and the code where stops is here
> >>
> >> ispqueue.c
> >> 913 buf = list_first_entry(&queue->queue, struct isp_video_buffer,
> >> stream); 914 ret = isp_video_buffer_wait(buf, nonblocking);
> >>
> >> Any idea ?
> >
> > My guess is that the CCDC doesn't receive the amount of lines it expects.
> >
> > The CCDC generates an interrupt at 2/3 of the image and another one at
> > the beginning of the last line. Start by checking if the ISP generates
> > any interrupt to the host with cat /proc/interrupts. If it doesn't, then
> > the CCDC receives less than 2/3 of the expected number of lines. If it
> > does, it probably receives between 2/3 and 3/3. You can add printk
> > statements in ispccdc_vd0_isr() and ispccdc_vd1_isr() to confirm this.
>
> Looks like my problem is that ispccdc_vd0_isr() and ispccdc_vd1_isr()
> are never called, adding printk in these functions I see only a lots
> of ispccdc_hs_vs_isr(), Seems the CCDC receives less than 2/3 of
> expected number lines. Using an oscilloscope I see VS and HS data
> lines of the camera interface, so seems physical interface is working.
>
> I guess I'm missing something to configure in tvp5150 driver but I
> don't know. Any help ?
Try to hack the ISP driver to generate the VD1 interrupt much earlier (after a
couple of lines only). If you get it, then modify the number of lines to see
how many lines the CCDC receives. This should hopefully give you a hint.
--
Regards,
Laurent Pinchart
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