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From:   Adam Ford <aford173@gmail.com>
Date:   Tue, 23 Oct 2018 10:19:28 -0500
Message-ID: <CAHCN7x+csKEk25CF=teUv+F5_GoTe6_3Yqb5PODLn+AmCCm88w@mail.gmail.com>
Subject: Re: i.MX6 MIPI-CSI2 OV5640 Camera testing on Mainline Linux
To:     Fabio Estevam <festevam@gmail.com>
Cc:     jacopo@jmondi.org, steve_longerbeam@mentor.com,
        Jagan Teki <jagan@amarulasolutions.com>,
        p.zabel@pengutronix.de, Fabio Estevam <fabio.estevam@nxp.com>,
        gstreamer-devel@lists.freedesktop.org, linux-media@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mon, Oct 22, 2018 at 7:40 AM Fabio Estevam <festevam@gmail.com> wrote:
>
> Hi Adam,
>
> On Mon, Oct 22, 2018 at 9:37 AM Adam Ford <aford173@gmail.com> wrote:
>
> > Thank you!  This tutorial web site is exactly what I need.  The
> > documentation page in Linux touched on the media-ctl links, but it
> > didn't explain the syntax or the mapping.  This graphical
> > interpretation really helps it make more sense.
>
> Is capturing working well on your i.MX6 board now?

Fabio,

Unfortunately, no.  I built the rootfs based on Jagan's instructions
at https://openedev.amarulasolutions.com/display/ODWIKI/i.CoreM6+1.5

I tried building both the 4.15-RC6 kernel, a 4.19 kernel and a 4.14 LTS kernel.

Using the suggested method of generating the graphical display of the
pipeline options, I am able to enable various pipeline options
connecting different /dev/videoX options tot he camera.  I have tried
both the  suggested method above as well as the instructions found in
Documentation/media/v4l-drivers/imx.rst for their respective kernels,
and I have tried multiple options to capture through
ipu1_csi1_capture, ipu2_csi1_capture, and ip1_ic_prepenc capture, and
all yield a broken pipe.

libv4l2: error turning on stream: Broken pipe
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could
not read from resource.
Additional debug info:
gstv4l2bufferpool.c(1064): gst_v4l2_buffer_pool_poll ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
poll error 1: Broken pipe (32)

I can hear the camera click when I start gstreamer and click again
when it stops trying to stream.

dmesg indicates a broken pipe as well..

[ 2419.851502] ipu2_csi1: pipeline start failed with -32

might you have any suggestions?

thanks,

adam