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    SubjectRe: [PATCH v3 00/24] i.MX Media Driver

    On 02/01/2017 01:30 AM, Philipp Zabel wrote:
    > On Tue, 2017-01-31 at 17:26 -0800, Steve Longerbeam wrote:
    > [...]
    >>> # Set pad formats
    >>> media-ctl --set-v4l2 "'tc358743 1-000f':0[fmt:UYVY/1920x1080]"
    >>> media-ctl --set-v4l2 "'imx6-mipi-csi2':1[fmt:UYVY2X8/1920x1080]"
    >>> media-ctl --set-v4l2 "'ipu1_csi0_mux':2[fmt:UYVY2X8/1920x1080]"
    >>> media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/1920x1080]"
    >>> v4l2-ctl -d /dev/video4 -V
    >>> # This still is configured to 640x480, which is inconsistent with
    >>> # the 'ipu1_csi0':2 pad format. The pad set_fmt above should
    >>> # have set this, too.
    >> Because you've only configured the source pads,
    >> and not the sink pads. The ipu_csi source format is
    >> dependent on the sink format - output crop window is
    >> limited by max input sensor frame, and since sink pad is
    >> still at 640x480, output is reduced to that.
    > No, it is set (see below). What happens is that capture_g_fmt_vid_cap
    > just returns the capture devices' priv->vdev.fmt, even if it is
    > incompatible with the connected csi subdevice's output pad format.
    > priv->vdev.fmt was never changed from the default set in
    > imx_media_capture_device_register, because capture_s/try_fmt_vid_cap
    > were not called yet.

    Ah, yep, this is a bug. Need to modify the capture device's
    width/height at .set_fmt() in the subdev's device-node source
    pad (csi and prpenc/vf).

    >> Maybe I'm missing something, is it expected behavior that
    >> a source format should be automatically propagated to
    >> the sink?
    > media-ctl propagates the output pad format to all remote subdevices'
    > input pads for all enabled links:

    Ah cool, I wasn't aware media-ctl did this, but it makes sense and
    makes it easier on the user.


    >>> v4l2-ctl --list-formats -d /dev/video4
    >>> # This lists all the RGB formats, which it shouldn't. There is
    >>> # no CSC in this pipeline, so we should be limited to YUV formats
    >>> # only.
    >> right, need to fix that. Probably by poking the attached
    >> source subdev (csi or prpenc/vf) for its supported formats.
    > You are right, in bayer/raw mode only one specific format should be
    > listed, depending on the CSI output pad format.
    > regards
    > Philipp

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