Hi,
I'm using the PSP 2.6.32 kernel (03.00.01.06), and I'm having trouble with using multiple buffers in the v4l2 layer streaming.
I am using a camera sensor connected to omap isp via parallel interface. Right now using a single buffer, the streaming is happening fine from my camera. To make room for parallel processing I need to make use of the multiple buffering support.
I know that v4l2 supports upto 32 buffers which can be queued up for enqueue and dequeue operation so that the streaming operation is faster. If I request for four buffers (using VIDIOC_REQBUFS) what I see is that only first buffer has valid data while the remaing three are empty. Please note that I am using V4L2_MEMORY_MMAP memory
Please see the following kernel debug prints got while running the camera streaming application:
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vbuf: reqbufs: bufs=4, size=0x96000 [600 pages total]
vbuf: mmap setup: 4 buffers, 614400 bytes each
vbuf: qbuf: requesting next field
vbuf: qbuf: succeded
vbuf: qbuf: requesting next field
vbuf: qbuf: succeded
vbuf: qbuf: requesting next field
vbuf: qbuf: succeded
vbuf: qbuf: requesting next field
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_queue: queue 0 vb 0, mmu 1000
ISPCTRL: <1>isp_buf_queue: queue 1 vb 1, mmu 97000
ISPCTRL: <1>isp_buf_queue: queue 2 vb 2, mmu 12d000
ISPCTRL: <1>isp_buf_queue: queue 3 vb 3, mmu 1c3000
ISPCTRL: <1>isp_buf_process: finish 0 mmu 00001000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 4 vb 0, mmu 1000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 1 mmu 00097000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 5 vb 1, mmu 97000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 2 mmu 0012d000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 6 vb 2, mmu 12d000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 3 mmu 001c3000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 7 vb 3, mmu 1c3000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 4 mmu 00001000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 8 vb 0, mmu 1000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 5 mmu 00097000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 9 vb 1, mmu 97000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 6 mmu 0012d000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 10 vb 2, mmu 12d000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 7 mmu 001c3000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 11 vb 3, mmu 1c3000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 8 mmu 00001000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 12 vb 0, mmu 1000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 9 mmu 00097000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 13 vb 1, mmu 97000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 10 mmu 0012d000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 14 vb 2, mmu 12d000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 11 mmu 001c3000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 15 vb 3, mmu 1c3000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 12 mmu 00001000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 16 vb 0, mmu 1000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 13 mmu 00097000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 17 vb 1, mmu 97000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 14 mmu 0012d000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 18 vb 2, mmu 12d000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 15 mmu 001c3000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 19 vb 3, mmu 1c3000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 16 mmu 00001000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 20 vb 0, mmu 1000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 17 mmu 00097000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 21 vb 1, mmu 97000
vbuf: qbuf: succeded
ISPCTRL: <1>isp_buf_process: finish 18 mmu 0012d000
vbuf: dqbuf: state is done
vbuf: qbuf: requesting next field
ISPCTRL: <1>isp_buf_queue: queue 22 vb 2, mmu 12d000
vbuf: qbuf: succeded
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I guess something is going wrong in the isp side.Can somebody please help me with this issue?
Thanks & Regards,
Aparna
