mx2_camera driver on mx27ipcam: dma_alloc_coherent size failed

["Jan Pohanka" <xhpohanka@gmail.com>]

Dear all,

I'm playing with imx27ipcam reference design and I would like to use more  
recent (or actual) kernel than the one in BSP (2.6.19). I had no problems  
with running 2.6.39 version from mainline, and now I want to get some  
signal from CMOS chip. As there is no driver for mt9d131 yet I modified  
the mt9m111 driver to communicate wit it.
Driver gets correctly initialized

mx2-camera mx2-camera.0: initialising
mx2-camera mx2-camera.0: Camera clock frequency: 6250000
mx2-camera mx2-camera.0: Using EMMA
camera 0-0: Probing 0-0
mx27ipcam_camera_power: 1
mx27ipcam_camera_reset
mx2-camera mx2-camera.0: Camera driver attached to camera 0
mt9m111 0-0048: read  reg.000 -> 1519
mt9m111 0-0048: Detected a MT9D131 chip ID 1519
camera 0-0: Found 8 supported formats.
mx2-camera mx2-camera.0: Camera driver detached from camera 0
mx27ipcam_camera_power: 0
mx2-camera mx2-camera.0: MX2 Camera (CSI) driver probed, clock frequency:  
6250000

For example this command should capture several frames
ffmpeg -s qvga -r 30 -t 2 -pix_fmt yuyv422 -f video4linux2 -i /dev/video0  
temp_vid.h263

however there is some problems with dma_contig allocation
mx2-camera mx2-camera.0: dma_alloc_coherent size 155648 failed
[video4linux2 @ 0xfa8c50]mmap: Cannot allocate memory
/dev/video0: Input/output error

...
camera 0-0: mmap called, vma=0xc397fd30
camera 0-0: vma start=0x4014c000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fcd8
camera 0-0: vma start=0x40ee8000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fc80
camera 0-0: vma start=0x40fa4000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fc28
camera 0-0: vma start=0x4109a000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fbd0
camera 0-0: vma start=0x41124000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fb78
camera 0-0: vma start=0x4118a000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fb20
camera 0-0: vma start=0x41241000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fac8
camera 0-0: vma start=0x41277000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fa70
camera 0-0: vma start=0x412c3000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397fa18
camera 0-0: vma start=0x41377000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397f9c0
camera 0-0: vma start=0x41416000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397f968
camera 0-0: vma start=0x4147f000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397f910
camera 0-0: vma start=0x414a5000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397f8b8
camera 0-0: vma start=0x41542000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397f860
camera 0-0: vma start=0x415ba000, size=155648, ret=0
camera 0-0: mmap called, vma=0xc397f808
mx2-camera mx2-camera.0: dma_alloc_coherent size 155648 failed
camera 0-0: vma start=0x41667000, size=155648, ret=-12
mx2-camera mx2-camera.0: Camera driver detached from camera 0
mx27ipcam_camera_power: 0
camera 0-0: camera device close


It seems like there is no dma buffer initialized for mx2_camera driver.
Could please anyone give me some hint how to deal with it?

regards
Jan

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