Re: ISP buffer issue

[Gary Thomas <gary@mlbassoc.com>]

Gary Thomas wrote:
> I'm having trouble with the OMAP3 camera (ISP) support when
> I have a large sensor.  I'm working with a 3M CCD sensor which
> has a native resolution of 2048x1536.  The problem is when I
> run V4L2 code which tries to allocate & map buffers for input
> streaming.  If the frame is much bigger than PAL size (720x576)
> the system hangs.
> 
> I traced this into the ISP layer and found that when the
> buffer being allocated is over 1MB, this happens:
>   isp_tmp_buf_alloc: allocating 1531904 bytes
> which eventually fails in iommu_vmalloc()
> 
> Looking at the code, there seems to be some magic here - the
> buffer allocation falls over if the request is large.  I'm
> working from this code:
>   http://arago-project.org/git/people/vaibhav/ti-psp-omap-video.git
> starting from commit (ti_display head on 2009-07-23)
>   6810d6d683e768c3bc6b5647c214804045665e22

Hiroshi - I CC'd you directly as this code seems to be yours.
Could you comment on my problem?

Thanks

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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