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]" 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. -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
