Re: OMAP3 ISP and tvp5151 driver.

Hi Enric,

On Wednesday 19 January 2011 12:05:54 Enric Balletbò i Serra wrote:

2011/1/18 Laurent Pinchart [off-list ref]:

quoted

On Tuesday 18 January 2011 10:20:43 Enric Balletbò i Serra wrote:

quoted

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