Re: omap3isp device tree support

[Julien BERAUD <julien.beraud@parrot.com>]

Le 03/01/2014 12:30, Enrico a écrit :
> On Wed, Dec 18, 2013 at 11:09 AM, Enrico <ebutera@users.berlios.de> wrote:
>> On Tue, Dec 17, 2013 at 2:11 PM, Florian Vaussard
>> <florian.vaussard@epfl.ch> wrote:
>>> So I converted the iommu to DT (patches just sent), used pdata quirks
>>> for the isp / mtv9032 data, added a few patches from other people
>>> (mainly clk to fix a crash when deferring the omap3isp probe), and a few
>>> small hacks. I get a 3.13-rc3 (+ board-removal part from Tony Lindgren)
>>> to boot on DT with a working MT9V032 camera. The missing part is the DT
>>> binding for the omap3isp, but I guess that we will have to wait a bit
>>> more for this.
>>>
>>> If you want to test, I have a development tree here [1]. Any feedback is
>>> welcome.
>>>
>>> Cheers,
>>>
>>> Florian
>>>
>>> [1] https://github.com/vaussard/linux/commits/overo-for-3.14/iommu/dt
>> Thanks Florian,
>>
>> i will report what i get with my setup.
> And here i am.
>
> I can confirm it works, video source is tvp5150 (with platform data in
> pdata-quirks.c) in bt656 mode.
>
> Laurent, i used the two bt656 patches from your omap3isp/bt656 tree so
> if you want to push it you can add a Tested-by me.
>
> There is only one problem, but it's unrelated to your DT work.
>
> It's an old problem (see for example [1] and [2]), seen by other
> people too and it seems it's still there.
> Basically if i capture with yavta while the system is idle then it
> just waits without getting any frame.
> If i add some cpu load (usually i do a "cat /dev/zero" in a ssh
> terminal) it starts capturing correctly.
>
> The strange thing is that i do get isp interrupts in the idle case, so
> i don't know why they don't "propagate" to yavta.
>
> Any hints on how to debug this?
>
> Enrico
>
> [1]: https://linuxtv.org/patch/7836/
> [2]: https://www.mail-archive.com/linux-media@vger.kernel.org/msg44923.html
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I have had what looked a lot like these problems before and it was due 
to a wrong configuration of the ccdc cropping regarding to the blanking. 
Could you send me the configuration of the pipeline that you apply with 
media-ctl, just in case this is the same problem.

Regards,
Julien BERAUD