Trouble using OMAP3530 previewer in oneshot mode

[Felix Radensky <felix@embedded-sol.com>]

Hi,

I'm trying to run OMAP3 ISP previewer in oneshot mode, without much success.
My goal is to put a 6MB Bayer10 image (captured on the same OMAP3 EVM)
into RAM, run previewer and get its output in RAM. I use linux-2.6.29 kernel
with ISP driver from omap3camera git tree.

For testing purposes Bayer10 image is stored into a file. My driver 
allocates
a 6MB buffer using iommu_vmalloc(), application maps this buffer  using
driver's mmap() method, copies input file into a buffer and signals the 
driver to
start a previewer. In PREV_DONE interrupt callback the driver wakes
application which stores previewer output from buffer into a file.

The following code runs previewer in oneshot mode (error checking 
removed for simplicity)

int isppreview_set_image_size(int width, int height)
{
    isp_obj.module.preview_input_height = height;
    isp_obj.module.preview_input_width = width;
    isp_obj.module.isp_pipeline = OMAP_ISP_PREVIEW;

    isppreview_try_size(isp_obj.module.preview_input_width,
                     isp_obj.module.preview_input_height,
                     &isp_obj.module.preview_output_width,
                     &isp_obj.module.preview_output_height);

    isppreview_config_inlineoffset(height * 2);
 
    isppreview_config_size(isp_obj.module.preview_input_width,
                    isp_obj.module.preview_input_height,
                    isp_obj.module.preview_output_width,
                    isp_obj.module.preview_output_height);
 }

int oneshot(int width, int height)
{
    isppreview_request();
    isp_set_callback(CBK_PREV_DONE, prev_done_cbk, NULL, NULL);

    isppreview_config_datapath(PRV_RAW_MEM, PREVIEW_MEM);
    isppreview_set_inaddr(prev_mem_mmu);
    isppreview_set_outaddr(prev_mem_mmu);
    isppreview_set_image_size(width, height);
    isp_enable_interrupts(0);
    isppreview_enable(1);
}

The PREV_DONE interrupt arrives, application saves resulting
image into a file, but it contains junk. The input file is known to
be good. The buffer mapping is good as well.

What am I doing wrong ?

Thanks a lot for your help.

Felix.