On Mon, 2017-03-20 at 14:17 +0000, Russell King - ARM Linux wrote: > 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 > > > :ref:`VIDIOC_SUBDEV_S_SELECTION <VIDIOC_SUBDEV_G_SELECTION>` IOCTL > > > 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]" Thanks, that works, too. > 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. I can confirm this. I don't see any place in v4l2_subdev_parse_pad_format that handles the "," separator. There's just whitespace skipping between the v4l2-properties. regards Philipp -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
