The NVIDIA DRIVE™ 5.0 platforms support dynamic voltage scaling for CPU and GPU. The BPMP sets CPU and GPU voltage settings based on the chip process, current frequency, and current temperature. It also dynamically updates target voltage, based on the current frequency and current temperature.

The BPMP determines the target voltage, based on GPU frequency. You can view GPU voltage scaling table with the following command:

The following is example result from that command:

The column index specifies frequency in MHz and NDIV value for chip temperature. The row index specifies voltage in mV. The current GPU frequency is the half of the nafll_gpu clock output. For example, if the current GPU frequency is 1275 MHz, then the BPMP sets the GPU voltage setting to 934 mV. The BPMP dynamically changes voltages based on frequency.

The following commands show how to locate GPU settings information:

Due to analog-to-digital converter (ADC) calibration issues on the A01 board, GPU frequency may be less than 1 GHz. You can query for both the software-requested GPU frequency and the current GPU frequency.

The BPMP determines the target voltage, based on CPU frequency. The VDD_CPU is shared with BCPU(A57) and MCPU(Denver).

BCPU(A57) voltage scaling can be viewed with the following command:

MCPU(Denver) voltage scaling can be viewed with the following command:

The column index specifies frequency in MHz and NDIV value for chip temperature. The row index specifies voltage in mV. The VDD_CPU is shared with BCPU(A57) and MCPU(Denver). So the actual voltage is set to higher one of the two required voltages. For example, if the current BCPU(A57) frequency is 1920 MHz and MCPU(Denver) frequency is 2035 MHz, then the BPMP sets the CPU voltage setting to 945 mV. Because BCPU 1920 MHz requires 903 mV and MCPU 2035 MHz requires 945 mV. The BPMP dynamically changes voltages based on frequency.

The following ways describe how to locate CPU settings information: