Re: Translation faults with OMAP ISP

[Lane Brooks <lane@brooks.nu>]

On 11/19/2010 06:29 AM, David Cohen wrote:
> On Thu, Nov 18, 2010 at 12:17:21AM +0100, ext Lane Brooks wrote:
>> On Wednesday 17 November 2010 00:46:27 Lane Brooks wrote:
>>>> Laurent,
>>>>
>>>> I am getting iommu translation errors when I try to use the CCDC output
>>>> after using the Resizer output.
>>>>
>>>> If I use the CCDC output to stream some video, then close it down,
>>>> switch to the Resizer output and open it up and try to stream, I get the
>>>> following errors spewing out:
>>>>
>>>> omap-iommu omap-iommu.0: omap2_iommu_fault_isr: da:00d0ef00 translation
>>>> fault
>>>> omap-iommu omap-iommu.0: iommu_fault_handler: da:00d0ef00 pgd:ce664034
>>>> *pgd:00000000
>>>>
>>>> and the select times out.
>>>>
>>>>    From a fresh boot, I can stream just fine from the Resizer and then
>>>> switch to the CCDC output just fine. It is only when I go from the CCDC
>>>> to the Resizer that I get this problem. Furthermore, when it gets into
>>>> this state, then anything dev node I try to use has the translation
>>>> errors and the only way to recover is to reboot.
>>>>
>>>> Any ideas on the problem?
> I'm not sure if it's your case, but OMAP3 ISP driver does not support
> pipeline with multiples outputs yet. We have to return error from the
> driver in this case. If you configured CCDC to write to memory and then
> to write to preview/resizer afterwards without deactivating the link to
> write to memory, you may face a similar problem you described.
>
> Can you please try a patch I've sent to you (CC'ing linux-media) with subject:
> "[omap3isp][PATCH] omap3isp: does not allow pipeline with multiple video
> outputs yet"?
>
> Regards,
>
> David
David,

I am not trying to use multiple outputs simultaneously. I get the 
translation error with the following sequence:

- Open resizer output and setup media links.
- Stream some images.
- Close resizer.
- Reset all media links.
- Open CCDC and setup media links.
- Try to stream some images but get translation faults.

Is your patch going to help with this problem?

Lane