On Mon, 7 Sep 2009, Marek Vasut wrote:
> Dne Po 7. září 2009 12:21:50 Robert Jarzmik napsal(a):
> > Marek Vasut <marek.vasut@xxxxxxxxx> writes:
> > > How's it supposed to get BGR555 if the pxa-camera doesnt support that ?
> > > Will the v4l2 layer convert it or something ?
> >
> > In pxa_camera.c, function pxa_camera_get_formats() :
> > > default:
> > > /* Generic pass-through */
> > > formats++;
> > > if (xlate) {
> > > xlate->host_fmt = icd->formats + idx;
> > > xlate->cam_fmt = icd->formats + idx;
> > > xlate->buswidth = icd->formats[idx].depth;
> > > xlate++;
> > > dev_dbg(ici->dev,
> > > "Providing format %s in pass-through
> > > mode\n", icd->formats[idx].name);
> > > }
> > > }
> >
> > "Pass-through" means that if a sensors provides a cc, ie. BGR555 for
> > example, the bridge (pxa_camera) will "forward" to RAM the image in the
> > very same cc (ie. BGR555). In that case, the bridge is a dummy "sensor to
> > RAM" bus translator if you prefer.
> >
> > Marek, you should activate debug trace and watch for yourself. You can
> > trust Guennadi, when he says it will work, well ... it will work.
> >
> > If it's out of technical curiousity, check the function above. If you're
> > even more curious, there was a thread in linux-media about "RFC: bus
> > configuration setup for sub-devices", a very interesting one, especially
> > considering the "pass-through" issue.
>
> That one should work for RGB565X ? (the piece of code you posted ?) It's
> interesting it didnt work for me ... ok, I'll take it it works then, whatever.
> I'll test it again when I have time.
No, that one cannot work with rgb565x or any other format, not supported
by pxa directly and not complying to bus-width = bit-depth. But it will
work with the new imagebus API. Either see my explanations in a previous
mail, or check the patches I posted recently to the list.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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