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SubjectRe: [PATCH v5 38/39] media: imx: csi: fix crop rectangle reset in sink set_fmt
On Mon, Mar 20, 2017 at 03:00:51PM +0100, Philipp Zabel wrote:
> On Mon, 2017-03-20 at 12:08 +0000, Russell King - ARM Linux wrote:
> > The same document says:
> >
> > Scaling support is optional. When supported by a subdev, the crop
> > rectangle on the subdev's sink pad is scaled to the size configured
> > using the
> > using ``V4L2_SEL_TGT_COMPOSE`` selection target on the same pad. If the
> > subdev supports scaling but not composing, the top and left values are
> > not used and must always be set to zero.
> Right, this sentence does imply that when scaling is supported, there
> must be a sink compose rectangle, even when composing is not.
> I have previously set up scaling like this:
> media-ctl --set-v4l2 "'ipu1_csi0_mux':2[fmt:UYVY2X8/1920x1080@1/60]"
> media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/960x540@1/30]"
> Does this mean, it should work like this instead?
> media-ctl --set-v4l2 "'ipu1_csi0_mux':2[fmt:UYVY2X8/1920x1080@1/60]"
> media-ctl --set-v4l2 "'ipu1_csi0':0[fmt:UYVY2X8/1920x1080@1/60,compose:(0,0)/960x540]"
> media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/960x540@1/30]"
> I suppose setting the source pad format should not be allowed to modify
> the sink compose rectangle.

That is what I believe having read these documents several times, but
we need v4l2 people to confirm.

Note that setting the format on 'ipu1_csi0':0 should already be done by
the previous media-ctl command, so it should be possible to simplify
that to:

media-ctl --set-v4l2 "'ipu1_csi0_mux':2[fmt:UYVY2X8/1920x1080@1/60]"
media-ctl --set-v4l2 "'ipu1_csi0':0[compose:(0,0)/960x540]"
media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/960x540@1/30]"

I have tripped over a bug in media-ctl when specifying both a crop and
compose rectangle - the --help output suggests that "," should be used
to separate them. media-ctl rejects that, telling me the character at
the "," should be "]". Replacing the "," with " " allows media-ctl to
accept it and set both rectangles, so it sounds like a parser bug - I've
not looked into this any further yet.

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