decrease imx8mq cpu clk rate and gpu clk rate

[nccpu]

Hi,

I want to decrease imx8mq cpu clk from 800MHz-1300MHz to 500MHz-600MHz and gpu clk from 800MHz to 500MHz. How can I do? I use imx8mq evk board and BSP android9.0.2.

Thanks!

[nccpu]

@nxp TechSupport ,can you give me some suggestions?

[BiyongSUN]

For the cpu, you can use the DVFS CPU governor. 

It is pure linux knowledge, not for this i.MX Processor. it is the same linux knowledge for X86/X64. 

For the gpu, please read the BSP release document to use 

GPU DFS

[BiyongSUN]

gpu: gpu@38000000 {
compatible = "vivante,gc";
reg = <0x38000000 0x40000>;
interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk IMX8MQ_CLK_GPU_ROOT>,
<&clk IMX8MQ_CLK_GPU_SHADER_DIV>,
<&clk IMX8MQ_CLK_GPU_AXI>,
<&clk IMX8MQ_CLK_GPU_AHB>;
clock-names = "core", "shader", "bus", "reg";
#cooling-cells = <2>;
assigned-clocks = <&clk IMX8MQ_CLK_GPU_CORE_SRC>,
<&clk IMX8MQ_CLK_GPU_SHADER_SRC>,
<&clk IMX8MQ_CLK_GPU_AXI>,
<&clk IMX8MQ_CLK_GPU_AHB>,
<&clk IMX8MQ_GPU_PLL_BYPASS>;
assigned-clock-parents = <&clk IMX8MQ_GPU_PLL_OUT>,
<&clk IMX8MQ_GPU_PLL_OUT>,
<&clk IMX8MQ_GPU_PLL_OUT>,
<&clk IMX8MQ_GPU_PLL_OUT>,
<&clk IMX8MQ_GPU_PLL>;
assigned-clock-rates = <800000000>, <800000000>,
<800000000>, <800000000>, <0>;
power-domains = <&pgc_gpu>;
status = "disabled";