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From:   Michael Nazzareno Trimarchi <michael@amarulasolutions.com>
Date:   Tue, 11 Dec 2018 14:53:24 +0100
Message-ID: <CAOf5uwk0U0BA2vDB1=_Uay30cgtfGuWOm8339jsAwn+O78ZnFA@mail.gmail.com>
Subject: Re: Configure video PAL decoder into media pipeline
To:     jacopo@jmondi.org
Cc:     hverkuil@xs4all.nl, Jagan Teki <jagan@amarulasolutions.com>,
        mchehab@kernel.org, linux-media@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Philipp Zabel <p.zabel@pengutronix.de>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Jacopo

On Tue, Dec 11, 2018 at 12:39 PM jacopo mondi <jacopo@jmondi.org> wrote:
>
> Hi Michael,
>
> On Mon, Dec 10, 2018 at 10:45:02PM +0100, Michael Nazzareno Trimarchi wrote:
> > Hi Jacopo
> >
> > Let's see what I have done
> >
> > On Sun, Dec 9, 2018 at 8:39 PM jacopo mondi <jacopo@jmondi.org> wrote:
> > >
> > > Hi Michael, Jagan, Hans,
> > >
> > > On Sat, Dec 08, 2018 at 06:07:04PM +0100, Michael Nazzareno Trimarchi wrote:
> > > > Hi
> > > >
> > > > Down you have my tentative of connection
> > > >
> > > > I need to hack a bit to have tuner registered. I'm using imx-media
> > > >
> > > > On Sat, Dec 8, 2018 at 12:48 PM Michael Nazzareno Trimarchi
> > > > <michael@amarulasolutions.com> wrote:
> > > > >
> > > > > Hi
> > > > >
> > > > > On Fri, Dec 7, 2018 at 1:11 PM Hans Verkuil <hverkuil@xs4all.nl> 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?
> > > > >
> > >
> > > media-types.rst reports:
> > >
> > >     *  -  ``MEDIA_ENT_F_IF_VID_DECODER``
> > >        -  IF-PLL video decoder. It receives the IF from a PLL and decodes
> > >           the analog TV video signal. This is commonly found on some very
> > >           old analog tuners, like Philips MK3 designs. They all contain a
> > >           tda9887 (or some software compatible similar chip, like tda9885).
> > >           Those devices use a different I2C address than the tuner PLL.
> > >
> > > Is this what you were looking for?
> > >
> > > > > > >
> > > > > > > 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.
> > > > > > >
> > > >
> > > > [    3.379129] imx-media: ipu1_vdic:2 -> ipu1_ic_prp:0
> > > > [    3.384262] imx-media: ipu2_vdic:2 -> ipu2_ic_prp:0
> > > > [    3.389217] imx-media: ipu1_ic_prp:1 -> ipu1_ic_prpenc:0
> > > > [    3.394616] imx-media: ipu1_ic_prp:2 -> ipu1_ic_prpvf:0
> > > > [    3.399867] imx-media: ipu2_ic_prp:1 -> ipu2_ic_prpenc:0
> > > > [    3.405289] imx-media: ipu2_ic_prp:2 -> ipu2_ic_prpvf:0
> > > > [    3.410552] imx-media: ipu1_csi0:1 -> ipu1_ic_prp:0
> > > > [    3.415502] imx-media: ipu1_csi0:1 -> ipu1_vdic:0
> > > > [    3.420305] imx-media: ipu1_csi0_mux:5 -> ipu1_csi0:0
> > > > [    3.425427] imx-media: ipu1_csi1:1 -> ipu1_ic_prp:0
> > > > [    3.430328] imx-media: ipu1_csi1:1 -> ipu1_vdic:0
> > > > [    3.435142] imx-media: ipu1_csi1_mux:5 -> ipu1_csi1:0
> > > > [    3.440321] imx-media: adv7180 2-0020:1 -> ipu1_csi0_mux:4
> > > >
> > > > with
> > > >        tuner: tuner@43 {
> > > >                 compatible = "tuner";
> > > >                 reg = <0x43>;
> > > >                 pinctrl-names = "default";
> > > >                 pinctrl-0 = <&pinctrl_tuner>;
> > > >
> > > >                 ports {
> > > >                         #address-cells = <1>;
> > > >                         #size-cells = <0>;
> > > >                         port@1 {
> > > >                                 reg = <1>;
> > > >
> > > >                                 tuner_in: endpoint {
> > >
> > > Nit: This is the tuner output, I would call this "tuner_out"
> > >
> >
> > Done
> >
> > > >                                         remote-endpoint = <&tuner_out>;
> > > >                                 };
> > > >                         };
> > > >                 };
> > > >         };
> > > >
> > > >         adv7180: camera@20 {
> > > >                 compatible = "adi,adv7180";
> > >
> > > One minor thing first: look at the adv7180 bindings documentation, and
> > > you'll find out that only devices compatible with "adv7180cp" and
> > > "adv7180st" shall declare a 'ports' node. This is minor issues (also,
> > > I don't see it enforced in driver's code, but still worth pointing it
> > > out from the very beginning)
> > >
> > > >                 reg = <0x20>;
> > > >                 pinctrl-names = "default";
> > > >                 pinctrl-0 = <&pinctrl_adv7180>;
> > > >                 powerdown-gpios = <&gpio3 20 GPIO_ACTIVE_LOW>; /* PDEC_PWRDN */
> > > >
> > > >                 ports {
> > > >                         #address-cells = <1>;
> > > >                         #size-cells = <0>;
> > > >
> > > >                         port@1 {
> > > >                                 reg = <1>;
> > > >
> > > >                                 adv7180_to_ipu1_csi0_mux: endpoint {
> > > >                                         remote-endpoint =
> > > > <&ipu1_csi0_mux_from_parallel_sensor>;
> > > >                                         bus-width = <8>;
> > > >                                 };
> > > >                         };
> > > >
> > > >                         port@0 {
> > > >                                 reg = <0>;
> > > >
> > > >                                 tuner_out: endpoint {
> > >
> > > Nit: That's an adv7180 endpoint, I would call it 'adv7180_in'
> > >
> >
> > Done
> >
> > > >                                         remote-endpoint = <&tuner_in>;
> > > >                                 };
> > > >                         };
> > > >                 };
> > > >         };
> > > >
> > > > Any help is appreciate
> > > >
> > >
> > > The adv7180(cp|st) bindings says the device can declare one (or more)
> > > input endpoints, but that's just to make possible to connect in device
> > > tree the 7180's device node with the video input port. You can see an
> > > example in arch/arm64/boot/dts/renesas/r8a77995-draak.dts which is
> > > similar to what you've done here.
> > >
> > > The video input port does not show up in the media graph, as it is
> > > just a 'place holder' to describe an input port in DTs, the
> > > adv7180 driver does not register any sink pad, where to connect any
> > > video source to.
> > >
> > > Your proposed bindings here look almost correct, but to have it
> > > working for real you should add a sink pad to the adv7180 registered
> > > media entity (possibly only conditionally to the presence of an input
> > > endpoint in DTs...). You should then register a subdev-notifier, which
> > > registers on an async-subdevice that uses the remote endpoint
> > > connected to your newly registered input pad to find out which device
> > > you're linked to; then at 'bound' (or possibly 'complete') time
> > > register a link between the two entities, on which you can operate on
> > > from userspace.
> > >
> > > Your tuner driver for tda9885 (which I don't see in mainline, so I
> > > assume it's downstream or custom code) should register an async subdevice,
> > > so that the adv7180 registered subdev-notifier gets matched and your
> > > callbacks invoked.
> > >
> > > If I were you, I would:
> > > 1) Add dt-parsing routine to tda7180, to find out if any input
> > > endpoint is registered in DT.
> >
> > Done
> >
> > > 2) If it is, then register a SINK pad, along with the single SOURCE pad
> > > which is registered today.
> >
> > Done
> >
> > > 3) When parsing DT, for input endpoints, get a reference to the remote
> > > endpoint connected to your input and register a subdev-notifier
> >
> > Done
> >
> > > 4) Fill in the notifier 'bound' callback and register the link to
> > > your remote device there.
> >
> > Both are subdevice that has not a v4l2_device, so bound is not called from two
> > sub-device. Is this expected?
>
> That should not be an issue. As we discussed, I slightly misleaded
> you, pointing you to rcar-csi2, which implements a 'custom' matching
> logic, trying to match its remote on endpoints and not on device node.
>
>         priv->asd.match.fwnode =
>                 fwnode_graph_get_remote_endpoint(of_fwnode_handle(ep));
>
> I'm sorry about this.
>
> You better use something like:
>
>         asd->match.fwnode =
>                 fwnode_graph_get_remote_port_parent(endpoint);
>
> or the recently introduced 'v4l2_async_notifier_parse_fwnode_endpoints_by_port()'
> function, that does most of that for you.
>

- entity 80: adv7180 2-0020 (2 pads, 5 links)
             type V4L2 subdev subtype Decoder flags 0
             device node name /dev/v4l-subdev11
pad0: Sink
[fmt:UYVY8_2X8/720x240@1001/30000 field:alternate colorspace:smpte170m]
<- "ipu1_csi0_mux":4 []
-> "ipu1_csi0_mux":4 []
<- "tda9887":1 [ENABLED,IMMUTABLE]
pad1: Source
[fmt:UYVY8_2X8/720x240@1001/30000 field:alternate colorspace:smpte170m]
-> "tda9887":1 []
<- "tda9887":1 []

- entity 83: tda9887 (2 pads, 3 links)
             type V4L2 subdev subtype Unknown flags 0
pad0: Sink
pad1: Source
<- "adv7180 2-0020":1 []
-> "adv7180 2-0020":0 [ENABLED,IMMUTABLE]
-> "adv7180 2-0020":1 []


Now the only problem is that I have a link in the graph that I have
not defined that not le me to stream. Look and png file I can see an
hard link from tda9887 to csi. Do you know why is coming?

Michael

> Sorry about this.
> Thanks
>    j
>
> >
> >
> > > 5) Make sure your tuner driver registers its subdevice with
> > > v4l2_async_register_subdev()
> > >
> > > A good example on how to register subdev notifier is provided in the
> > > rcsi2_parse_dt() function in rcar-csi2.c driver (I'm quite sure imx
> > > now uses subdev notifiers from v4.19 on too if you want to have a look
> > > there).
> >
> > Already seen it
> >
> > >
> > > -- Entering slippery territory here: you might want more inputs on this
> > >
> > > To make thing simpler&nicer (TM), if you blindly do what I've suggested
> > > here, you're going to break all current adv7180 users in mainline :(
> > >
> > > That's because the v4l2-async design 'completes' the root notifier,
> > > only if all subdev-notifiers connected to it have completed first.
> > > If you add a notifier for the adv7180 input ports unconditionally, and
> >
> > I don't get to complete. So let's proceed by step
> >
> > Michael
> >
> > > to the input port is connected a plain simple "composite-video-connector",
> > > as all DTs in mainline are doing right now, the newly registered
> > > subdev-notifier will never complete, as the "composite-video-connector"
> > > does not register any subdevice to match with. Bummer!
> > >
> > > A quick look in the code base, returns me that, in example:
> > > drivers/gpu/drm/meson/meson_drv.c filters on
> > > "composite-video-connector" and a few other compatible values. You
> > > might want to do the same, and register a notifier if and only if the
> > > remote input endpoint is one of those known not to register a
> > > subdevice. I'm sure there are other ways to deal with this issue, but
> > > that's the best I can come up with...
> > > ---
> > >
> > > Hope this is reasonably clear and that I'm not misleading you. I had to
> > > use adv7180 recently, and its single pad design confused me a bit as well :)
> > >
> > > Thanks
> > >   j
> > >
> > > > Michael
> > > >
> > > > > > > Jagan.
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > --
> >
> >
> >
> > --
> > | Michael Nazzareno Trimarchi                     Amarula Solutions BV |
> > | COO  -  Founder                                      Cruquiuskade 47 |
> > | +31(0)851119172                                 Amsterdam 1018 AM NL |
> > |                  [`as] http://www.amarulasolutions.com               |


-- 
| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
|                  [`as] http://www.amarulasolutions.com               |