linux-kernel - Re: [PATCH v1 11/17] ARM: dts: imx6q-apalis: Add ov5640 mipi csi camera

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Message-ID: <CAEHkU3Xtm9gk6xXr586M3pm4tPpFA-fGn+QyKXfF+Cqqa8VK8g@mail.gmail.com>
Date:   Wed, 18 May 2022 16:21:03 +0200
From:   Max Krummenacher <max.oss.09@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Max Krummenacher <max.krummenacher@...adex.com>,
        Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 11/17] ARM: dts: imx6q-apalis: Add ov5640 mipi csi camera

Hi Fabio

On Mon, May 16, 2022 at 2:08 PM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Max,
>
> On Mon, May 16, 2022 at 8:59 AM Max Krummenacher <max.oss.09@...il.com> wrote:
> >
> > From: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
> >
> > The Apalis iMX6 modules allow connecting a mipi-csi video input.
> > Add support for our OV5640 camera module but have it disabled.
> > This allows to enable it in an overlay per the current system
> > configuration.
> >
> > Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
> > Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>
> > ---
> >
> >  arch/arm/boot/dts/imx6qdl-apalis.dtsi | 67 ++++++++++++++++++++++++++-
> >  1 file changed, 66 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > index 506d040ea37a..0d1004eede62 100644
> > --- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > +++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
> > @@ -29,6 +29,12 @@
> >                 status = "disabled";
> >         };
> >
> > +       clk_ov5640_osc: clk_ov5640_osc_int {
>
> Node names should have "-", not "_"

Ups, missed that one. Will fix it in V2. Thanks.

>
> clk_ov5640_osc: clk-ov5640-osc
>
> Also, no need for the _int suffix.
>
> Just curious: is ov5640 mipi support functional?
>
> I recalled that I had issues in getting Gstreamer pipeline to capture
> from the ov5640 mipi.
>
> There were some errors related to LP-11 during the start of the capture.

In my (limited) testing I saw no issues that the camera would not come up.
It takes 2 to 3 seconds until the pipeline is running but I noted no hickups.
I did this with setting the resolution to 640x480 and 1920x1080 which
probably would not relate to the LP-11 issue you mention.

I.e. I set up the v4l2 pipeline and start capture to the screen as follows:
```
media-ctl -l "'ov5640 1-003c':0 -> 'imx6-mipi-csi2':0[1]"
media-ctl -l "'imx6-mipi-csi2':2 -> 'ipu1_csi1':0[1]"
media-ctl -l "'ipu1_csi1':2 -> 'ipu1_csi1 capture':0[1]"
media-ctl -V "'ov5640 1-003c':0 [fmt:UYVY2X8/640x480 field:none]"
media-ctl -V "'imx6-mipi-csi2':2 [fmt:UYVY2X8/640x480 field:none]"
media-ctl -V "'ipu1_csi1':2 [fmt:AYUV32/640x480 field:none]"
gst-launch-1.0 v4l2src device='/dev/video0' ! videoconvert ! waylandsink
```

Max