topic Re: decrease imx8mq cpu clk rate and gpu clk rate in i.MX Processors

decrease imx8mq cpu clk rate and gpu clk rate

nccpu — Tue, 22 Feb 2022 02:24:33 GMT

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!

Re: decrease imx8mq cpu clk rate and gpu clk rate

nccpu — Wed, 23 Feb 2022 02:10:48 GMT

@nxp TechSupport ,can you give me some suggestions?

Re: decrease imx8mq cpu clk rate and gpu clk rate

BiyongSUN — Thu, 24 Feb 2022 08:42:22 GMT

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

Re: decrease imx8mq cpu clk rate and gpu clk rate

BiyongSUN — Fri, 25 Feb 2022 02:47:09 GMT

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";