Jetson Orin NX image capture error

[shenchengzha]

When capturing images with Jetson Orin NX, the captured images are incorrect. Below are the relevant details and the captured image:

sensor: imx568
FPS:79.1

The configuration we selected for IMX568 is as follows:
10bit 79.1FPS 2448*2048 4lane 54MHz

dts:

IMX568_cam1: imx568_mipi@1a {
                                reg                     = <0x1a>;
                                compatible              = "nvidia,nv_imx568";
                                devnode                 = "video1";
                                use_sensor_mode_id      = "false";
                                sensor_model            = "vc_mipi";

                                num_lanes               = "4";
                                trigger_mode            = "0";
                                io_mode                 = "0";


                                physical_w              = "6.707";
                                physical_h              = "5.612";
                                mode0 {
                                        num_lanes                = "4";
                                        tegra_sinterface         = "serial_c";
                                        embedded_metadata_height = "4";
                                        readout_orientation      = "0";
                                        lane_polarity            = "0";


                                        active_l                 = "0";
                                        active_t                 = "0";
                                        active_w                 = "2448"; 
                                        active_h                 = "2048"; 
                                        mode_type                = "bayer";
                                        pixel_phase              = "rggb";
                                        csi_pixel_bit_depth      = "10";

                                        min_gain_val             = "0";         // mdB
                                        max_gain_val             = "48000";     // mdB
                                        step_gain_val            = "100";       // mdB
                                        default_gain             = "0";         // mdB

                                        min_exp_time             = "1";         // us
                                        max_exp_time             = "1000000";   // us
                                        step_exp_time            = "1";         // us
                                        default_exp_time         = "10000";     // us

                                        min_framerate            = "100";       // mHz
                                        max_framerate            = "79100";     // mHz
                                        step_framerate           = "100";       // mHz
                                        default_framerate        = "79100";     // mHz


                                        gain_factor              = "1000";
                                        exposure_factor          = "1000000";
                                        framerate_factor         = "1000";
                                        inherent_gain            = "1";
                                        min_hdr_ratio            = "1";
                                        max_hdr_ratio            = "1";

                                        line_length              = "0";
                                        phy_mode                 = "DPHY";
                                        discontinuous_clk        = "no";
                                        mclk_khz                 = "54000";

                                        pix_clk_hz               = 475200000; // 1188M * 4 / 10 = 475200000
                                        mclk_multiplier          = "0.0";       
                                        cil_settletime           = "0";
                                        dpcm_enable              = "false";
                                };

                                ports {
                                        #address-cells = <1>;
                                        #size-cells = <0>;
                                        port@0 {
                                                reg = <0>;
                                                vc_mipi_out1: endpoint {
                                                        port-index = <2>;
                                                        bus-width = <BUS_WIDTH>;
                                                        remote-endpoint = <&vc_csi_in1>;
                                                };
                                        };
                                };
                        };

During debugging, using pix_clk_hz = 1188 * 4 / 10 = 475200000 or pix_clk_hz = 2448 * 2048 * 79.1 = 396568166 , the resulting image outputs are incorrect. What could be the reason for this? Are the calculations for pix_clk_hz correct? Why do the results differ between these two calculation methods?

[JerryChang]

hello shenchengzha,

may I double confirm the Jetpack release version you’re now using.

I’m usually calculated by sensor CSI lane output rate,
for instance, pixel_clk_hz = sensor data rate per lane (Mbps) * number of lanes / bits per pixel
it’s true that those formulas within Sensor Pixel Clock might return different results.
you may simply choose the higher clock settings for sensor bring-up.

@shenchengzha

the captured images are incorrect.

I don’t think this abnormal capture result caused by pixel clock settings,
there’re some patterns, which looks like light waves to me, for instance, did you place the camera toward the lights?
besides, what’s the sensor lens you’re using?