CB1 3d Acceleration running Armbian Bookworm

CB1 Armbian Bookworm 3D Acceleration Optimization.md

This is a quick guide for optimizing the 3D acceleration for the Bigtreetech CB1 running Armbian Bookworm. Armbian already has the proper drivers installed, so disregard my previous guide.

**NOTE: The best perorming UI with panfrost is Gnome Wayland##

To optimize the drivers, only a few things are needed:

1. Install the boot overlays to enable the cpu and gpu governors.
2. Set the governors in the OS.
3. Optional: Run the benchmark (glmark2 or kmscube)

Install boot overlays

1. Copy the 2 dts files (below) to your CB1. You will need SSH access to install them.
2. SSH into your CB1 and run the following commands:

$> sudo armbian-add-overlay sun50i-h616-cpu-opp.dts
$> sudo armbian-add-overlay sun50i-h616-gpu-opp.dts

3. Create a file /etc/default/cpufrequtils with exactly these contents:

ENABLE=false
MIN_SPEED=480000
MAX_SPEED=1512000
GOVERNOR=ondemand

4. Add the overlays to the armbian environment:

$> echo "user_overlays=sun50i-h616-gpu-opp sun50i-h616-cpu-opp" | sudo tee -a /boot/armbianEnv.txt

6. Reboot your CB1 for the overlays to take effect.

Set the governors to performance:

1. Run these commands to set the governor to performance:

$> echo performance | sudo tee /sys/devices/platform/soc/1800000.gpu/devfreq/1800000.gpu/governor
$> echo performance | sudo tee /sys/devices/system/cpu/cpufreq/policy0/scaling_governor

Run the benchmark

Depending on your UI installation, install and run glmark2 for some benchmark numbers. For Gnome Wayland, you would isntall glmark2-es2-wayland and run it from the terminal.

sun50i-h616-cpu-opp.dts

/dts-v1/;
/plugin/;
/ {
	compatible = "allwinner,sun50i-h616";

	fragment@0 {
		target-path = "/";
		__overlay__ {
			cpu_opp_table: opp-table-cpu {
				compatible = "operating-points-v2";
				opp-shared;

				opp-480000000 {
					opp-hz = /bits/ 64 <480000000>;
					opp-microvolt = <820000>;
					clock-latency-ns = <244144>; /* 8 32k periods */
				};

				opp-600000000 {
					opp-hz = /bits/ 64 <600000000>;
					opp-microvolt = <820000>;
					clock-latency-ns = <244144>; /* 8 32k periods */
				};

				opp-792000000 {
					opp-hz = /bits/ 64 <792000000>;
					opp-microvolt = <860000>;
					clock-latency-ns = <244144>; /* 8 32k periods */
				};

				opp-1008000000 {
					opp-hz = /bits/ 64 <1008000000>;
					opp-microvolt = <900000>;
					clock-latency-ns = <244144>; /* 8 32k periods */
				};

				opp-1200000000 {
					opp-hz = /bits/ 64 <1200000000>;
					opp-microvolt = <960000>;
					clock-latency-ns = <244144>; /* 8 32k periods */
				};

				opp-1512000000 {
					opp-hz = /bits/ 64 <1512000000>;
					opp-microvolt = <1100000>;
					clock-latency-ns = <244144>; /* 8 32k periods */
				};
			};
		};
	};

	fragment@2 {
		target=<&cpu0>;
		__overlay__ {
			operating-points-v2 = <&cpu_opp_table>;
		};
	};

	fragment@3 {
		target=<&cpu1>;
		__overlay__ {
			operating-points-v2 = <&cpu_opp_table>;
		};
	};

	fragment@4 {
		target=<&cpu2>;
		__overlay__ {
			operating-points-v2 = <&cpu_opp_table>;
		};
	};

	fragment@5 {
		target=<&cpu3>;
		__overlay__ {
			operating-points-v2 = <&cpu_opp_table>;
		};
	};
};

sun50i-h616-gpu-opp.dts

/dts-v1/;
/plugin/;
/ {
	compatible = "allwinner,sun50i-h616";

	fragment@0 {
		target=<&reg_dcdc3>;
		__overlay__ {
			regulator-min-microvolt = <500000>;
			regulator-max-microvolt = <1220000>;
		};
	};

	fragment@1 {
		target-path = "/";
		__overlay__ {
			gpu_opp_table: opp-table-1 {
				compatible = "operating-points-v2";
				opp-200000000 {
					opp-hz = /bits/ 64 <200000000>;
					opp-microvolt = <1100000>;
				};
				opp-312000000 {
					opp-hz = /bits/ 64 <312000000>;
					opp-microvolt = <1100000>;
				};
				opp-432000000 {
					opp-hz = /bits/ 64 <432000000>;
					opp-microvolt = <1100000>;
				};
				opp-528000000 {
					opp-hz = /bits/ 64 <528000000>;
					opp-microvolt = <1100000>;
				};
				opp-650000000 {
					opp-hz = /bits/ 64 <650000000>;
					opp-microvolt = <1100000>;
				};
			};
		};
	};

	fragment@2 {
		target=<&gpu>;
		__overlay__ {
			operating-points-v2 = <&gpu_opp_table>;
		};
	};
};

Quick note on the GPU voltages: bigtreetech/CB1-Kernel@09c4723

Long story short: the values you currently have here are effectively overvolting the GPU, and should probably be updated and lowered accordingly.