KonaExynos

Supported Devices

• Exynos 9820
• Exynos 9825
• Exynos 9810

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What is this?

A simple Android app that lets you edit custom GPU frequency tables without recompiling the kernel.

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How does it work?

1. Unpacks the DTB image from your device.
2. Converts the .dtb file to a readable .dts file.
3. Lets you edit the frequency table via the app UI.
4. Re-packs and flashes the modified image back to your device.

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How to Use

1. Install the app on an Exynos 9820/9825 device.
2. Grant root (su) permissions.
3. Press Edit GPU Freq Table.
4. Select your chipset.
5. Edit the table as needed.
6. Press Save GPU Freq Table.
7. Press Repack and Flash Image.
8. Reboot and test if it works.

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What kind of improvement can I expect?

• You can under-clock for battery savings, or add new frequency steps.
• Don’t expect miracles—hardware and firmware limits still apply.

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Prebuilt Binaries

• dtc
• extract_dtb
• repack_dtb: Self-crafted binary for merging DTB parts and creating a bootable image.

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PLL table example (PLL_G3D)

[PLL NAME] : PLL_G3D
[PLL TYPE] : 14160
[NUM OF FREQUENCY] : 13
    [FREQUENCY] : 754000000  [P] : 4  [M] : 116  [S] : 0  [K] : 0
    [FREQUENCY] : 702000000  [P] : 4  [M] : 108  [S] : 0  [K] : 0
    [FREQUENCY] : 676000000  [P] : 4  [M] : 104  [S] : 0  [K] : 0
    [FREQUENCY] : 650000000  [P] : 4  [M] : 100  [S] : 0  [K] : 0
    [FREQUENCY] : 598000000  [P] : 4  [M] : 184  [S] : 1  [K] : 0
    [FREQUENCY] : 572000000  [P] : 4  [M] : 176  [S] : 1  [K] : 0
    [FREQUENCY] : 432250000  [P] : 4  [M] : 133  [S] : 1  [K] : 0
    [FREQUENCY] : 377000000  [P] : 4  [M] : 116  [S] : 1  [K] : 0
    [FREQUENCY] : 325000000  [P] : 4  [M] : 100  [S] : 1  [K] : 0
    [FREQUENCY] : 260000000  [P] : 4  [M] : 160  [S] : 2  [K] : 0
    [FREQUENCY] : 199875000  [P] : 4  [M] : 123  [S] : 2  [K] : 0
    [FREQUENCY] : 156000000  [P] : 4  [M] : 96   [S] : 2  [K] : 0
    [FREQUENCY] : 99937000   [P] : 4  [M] : 123  [S] : 3  [K] : 0

Interpreting the parameters

For K=0 (integer-N), the typical relationship is:

• VCO: Fvco = (Fref * M) / P
• Output: Fout = Fvco / (2^S)

Where:

• P = pre-divider
• M = feedback multiplier
• S = post-divider exponent (divide by 2^S)
• K = fractional part (unused here because K=0)

From the table values, the reference clock resolves cleanly to:

• Fref ≈ 26 MHz

Exynos9820 Kernel

• After extensive testing and trying i came to the result. In the https://github.com/Creeeeger/9820_kernel kernel are in the forOC folder the 2 files which need to be modded and changed in order to increase clocks