Re: i.MX6 MIPI-CSI2 OV5640 Camera testing on Mainline Linux

[Adam Ford <aford173@gmail.com>]

On Tue, Oct 23, 2018 at 12:39 PM Steve Longerbeam
<steve_longerbeam@mentor.com> wrote:
>
>
> On 10/23/18 10:34 AM, Adam Ford wrote:
> > On Tue, Oct 23, 2018 at 11:36 AM Steve Longerbeam
> > <steve_longerbeam@mentor.com> wrote:
> >> Hi Adam,
> >>
> >> On 10/23/18 8:19 AM, Adam Ford wrote:
> >>> 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?
> >>
> >> This -EPIPE error might mean you have a mis-match of resolution, pixel
> >> format, or field type between one of the source->sink pad links. You can
> >> find out which pads have a mis-match by enabling dynamic debug in the
> >> kernel function __media_pipeline_start.
> > Following Jagan's suggestion, I tried to make sure all the resolution
> > and pixel formats were set the same between each source and sink.
> >
> > media-ctl --set-v4l2 "'ov5640 2-0010':0[fmt:UYVY2X8/640x480
> > field:none]"
> > media-ctl --set-v4l2 "'imx6-mipi-csi2':1[fmt:UYVY2X8/640x480
> > field:none]"
> > media-ctl --set-v4l2 "'ipu1_csi0_mux':2[fmt:UYVY2X8/640x480
> > field:none]"
> > media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/640x480 field:none]"
> >
> >> Also make sure you are attempting to stream from the correct /dev/videoN.
> > I have graphically plotted the pipeline using media-ctl --print-dot
> > and I can see the proper video is routed, but your dynamic debug
> > suggestion yielded something:
> >
> >     imx-media capture-subsystem: link validation failed for 'ov5640
> > 2-0010':0 -> 'imx6-mipi-csi2':0, error -32
>
>
> It's what I expected, you have a format mismatch between those pads.

Is the mismatch something I am doing wrong with:

media-ctl --set-v4l2 "'ov5640 2-0010':0[fmt:UYVY2X8/640x480 field:none]"
media-ctl --set-v4l2 "'imx6-mipi-csi2':2[fmt:UYVY2X8/640x480 field:none]"

or is there something else I need to do?  I just used Jagan's suggestion.

adam
>
> Steve
>
>
> >
> > I am assume this means the interface between the camera and the csi2
> > isn't working.  I am going to double check the power rails and the
> > clocks.  i can hear it click when activated and deactivated, so
> > something is happening.
> >
> > adam
> >
> >> Steve
> >>