Requested ISO BW 82160028 has been capped to VI's max BW 3916800

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
#1

Hi,
I am getting this error when I try to stream mipi camera

misc tegra_camera_ctrl: tegra_camera_update_isobw: Warning, Requested ISO BW 82160028 has been capped to VI's max BW 3916800

Is there any way to fix this ?

#3

Check below configure in your device tree to adjust the BW.

        tegra-camera-platform {
                compatible = "nvidia, tegra-camera-platform";
                /**
                * Physical settings to calculate max ISO BW
                *
                * num_csi_lanes = <>;
                * Total number of CSI lanes when all cameras are active
                *
                * max_lane_speed = <>;
                * Max lane speed in Kbit/s
                *
                * min_bits_per_pixel = <>;
                * Min bits per pixel
                *
                * vi_peak_byte_per_pixel = <>;
                * Max byte per pixel for the VI ISO case
                *
                * vi_bw_margin_pct = <>;
                * Vi bandwidth margin in percentage
                *
                * max_pixel_rate = <>;
                * Max pixel rate in Kpixel/s for the ISP ISO case
                *
                * isp_peak_byte_per_pixel = <>;
                * Max byte per pixel for the ISP ISO case
                *
                * isp_bw_margin_pct = <>;
                * Isp bandwidth margin in percentage
                */
                num_csi_lanes = <8>;
                max_lane_speed = <1500000>;
                min_bits_per_pixel = <10>;
                vi_peak_byte_per_pixel = <2>;
                vi_bw_margin_pct = <25>;
                max_pixel_rate = <750000>;
                isp_peak_byte_per_pixel = <5>;
                isp_bw_margin_pct = <25>;
#4

Hi @ShaneCCC ,
Can you let me know how to change to the required BW ?

misc tegra_camera_ctrl: tegra_camera_update_isobw: Warning, Requested ISO BW 82160028 has been capped to VI's max BW 3916800

Where these parameters are constant for my camera sensor.

num_csi_lanes = <2>;
max_lane_speed = <720000>;
min_bits_per_pixel = <10>;
max_pixel_rate = <90000>;

#5

You can trace the below code to figure it out.

…/kernel/nvidia/drivers/video/tegra/camera/tegra_camera_platform.c

#7