How to Using GPC-DMA MEM2MEM Function

Autonomous Machines Jetson & Embedded Systems Jetson TX2
4

Thank you.
i using this code in my module now. it’s worked.
but the speed is to lower.copy 4MB data speed only 51MB/S.

https://devtalk.nvidia.com/default/topic/1049482/jetson-tx2/used-gpc-dma-instead-of-memcpy-for-memory-copy/post/5327383/#5327383

i boost the system by sudo ./jetson_clocks.sh and max the emc clock by below command.

nvidia@tegra-ubuntu:~$ sudo su
root@tegra-ubuntu:/home/nvidia# echo 1 > /sys/kernel/debug/bpmp/debug/clk/emc/mrq_rate_locked
root@tegra-ubuntu:/home/nvidia# cat /sys/kernel/debug/bpmp/debug/clk/emc/max_rate
0
root@tegra-ubuntu:/home/nvidia#  echo 0 > /sys/kernel/debug/bpmp/debug/clk/emc/rate

why my board max_rate is 0 ?