I have to connect ADV7280-M (contained in the EVAL-ADV7280MEBZ board) board to Rock Pi 4B SoC. I have recompiled the kernel with added adv7180.c driver. The procedure for recompilation of the kernel I have taken from: https://wiki.radxa.com/Rockpi4/dev/kernel-4.4 After that I had to add ADV7280-M to the device tree. /dts-v1/; /plugin/; / { model = "ROCK PI 4B"; compatible = "rockchip,rockpi","rockchip,rk3399"; fragment@0 { target = <&i2c4>; __overlay__ { #address-cells = <1>; #size-cells = <0>; status = "okay"; adv7280@21 { compatible = "adi,adv7280-m"; reg = <0x21>; status = "okay"; pinctrl-names = "rockchip,camera_default"; port { adv7280_out: endpoint { remote-endpoint = <&mipi_in_ucam0>; data-lanes = <1>; }; }; }; }; }; fragment@1 { target = <&mipi_dphy_rx0>; __overlay__ { status = "okay"; }; }; fragment@2 { target = <&mipi_in_ucam0>; __overlay__ { remote-endpoint = <&adv7280_out>; data-lanes = <1>; }; }; }; With that DT, i have obtained correct output of “media-ctl -p” command, but when I try to start the streaming of data with: gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=NV12,width=1920,height=1080, framerate=30/1 ! videoconvert ! x264enc tune=zerolatency bitrate=500 speed-preset=superfast ! rtph264pay ! udpsink host=172.19.1.1 port=5000 I get the following error and system crashes: [ 246.739221] adv7180 4-0021: No active sensor [ 246.739613] rkisp1: open cif pipeline failed -32 I have found, that the problem is caused by the fact that adv7180.c driver does not set the sd->entity.type to MEDIA_ENT_T_V4L2_SUBDEV_SENSOR, and the drivers/media/platform/rockchip/isp1/dev.c file checks it in lines 153-164: /* find the subdev of active sensor */ sd = p->subdevs[0]; for (i = 0; i < p->num_subdevs; i++) { sd = p->subdevs[i]; if (sd->entity.type == MEDIA_ENT_T_V4L2_SUBDEV_SENSOR) break; } if (i == p->num_subdevs) { v4l2_warn(sd, "No active sensor\n"); return -EPIPE; } The question is, if the adv7180.c should set this type. If not, then I should define another pipeline element, corresponding to the analog video input. However, I couldn’t find any info how to do that. Therefore, I have modified the adv7180.c to set the required type. Unfortunately, it does not help, as my device fails the next check (lines 165-169 in dev.c): ctrl = v4l2_ctrl_find(sd->ctrl_handler, V4L2_CID_PIXEL_RATE); if (!ctrl) { v4l2_warn(sd, "No pixel rate control in subdev\n"); return -EPIPE; } After an attempt to start streaming, I get adv7180 4-0021: No pixel rate control in subdev and the system crashes again. Of course, I can add a fake PIXEL_RATE control to adv7180.c, but it does not seem to be the right solution. Probably indeed, it is necessary to define a ``composite video input'' element in the pipeline, that would have the entity type set to MEDIA_ENT_T_V4L2_SUBDEV_SENSOR and would provide the V4L2_CID_PIXEL_RATE control. I’ll appreciate any suggestions how to do it in the right way. TIA & Regards, Wojtek
Problem with connecting ADV7280-M to V4L in Rock Pi 4B SoC
Started by ●January 10, 2020