Re: Configure video PAL decoder into media pipeline

[Michael Nazzareno Trimarchi]

Hi

On Fri, Dec 7, 2018 at 1:11 PM Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
>
> On 12/07/2018 12:51 PM, Jagan Teki wrote:
> > Hi,
> >
> > We have some unconventional setup for parallel CSI design where analog
> > input data is converted into to digital composite using PAL decoder
> > and it feed to adv7180, camera sensor.
> >
> > Analog input =>  Video PAL Decoder => ADV7180 => IPU-CSI0
>
> Just PAL? No NTSC support?
>
For now does not matter. I have registere the TUNER that support it
but seems that media-ctl is not suppose to work with the MEDIA_ENT_F_TUNER

Is this correct?

> >
> > The PAL decoder is I2C based, tda9885 chip. We setup it up via dt
> > bindings and the chip is
> > detected fine.
> >
> > But we need to know, is this to be part of media control subdev
> > pipeline? so-that we can configure pads, links like what we do on
> > conventional pipeline  or it should not to be part of media pipeline?
>
> Yes, I would say it should be part of the pipeline.
>

Ok I have created a draft patch to add the adv some new endpoint but
is sufficient to declare tuner type in media control?

Michael

> >
> > Please advise for best possible way to fit this into the design.
> >
> > Another observation is since the IPU has more than one sink, source
> > pads, we source or sink the other components on the pipeline but look
> > like the same thing seems not possible with adv7180 since if has only
> > one pad. If it has only one pad sourcing to adv7180 from tda9885 seems
> > not possible, If I'm not mistaken.
>
> Correct, in all cases where the adv7180 is used it is directly connected
> to the video input connector on a board.
>
> So to support this the adv7180 driver should be modified to add an input pad
> so you can connect the decoder. It will be needed at some point anyway once
> we add support for connector entities.
>
> Regards,
>
>         Hans
>
> >
> > I tried to look for similar design in mainline, but I couldn't find
> > it. is there any design similar to this in mainline?
> >
> > Please let us know if anyone has any suggestions on this.
> >
> > Jagan.
> >
>


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| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
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