How to overclock your Geekbox or other RK3368 based products

[geekbuying 0]

Hi, here is a guidance for some forks who want to overclock for their Geekbox or other RK3368 based products.

Steps:
1. Add the support for higher cpu frequency, follow commit for reference:
CODE: SELECT ALL

diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
index 325eb2c..7284bae 100755
--- a/drivers/clk/rockchip/clk-pll.c
+++ b/drivers/clk/rockchip/clk-pll.c
@@ -239,6 +239,16 @@ static const struct pll_clk_set rk312xplus_pll_com_table[] = {
 
 static const struct apll_clk_set rk3368_apllb_table[] = {
                        /*(_mhz,        nr,     nf,     no,     aclkm,  atclk,  pclk_dbg)*/
+       #ifdef CONFIG_GEEKBOX_OVERCLOCK
+       _RK3368_APLL_SET_CLKS(1992, 1,  83, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1944, 1,  81, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1896, 1,  79, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1848, 1,  77, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1800, 1,  75, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1752, 1,  73, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1704, 1,  71, 1,  2,  6,  6),
+       _RK3368_APLL_SET_CLKS(1656, 1,  69, 1,  2,  6,  6),
+       #endif
        _RK3368_APLL_SET_CLKS(1608,     1,      67,     1,      2,      6,      6),
        _RK3368_APLL_SET_CLKS(1560,     1,      65,     1,      2,      6,      6),
        _RK3368_APLL_SET_CLKS(1512,     1,      63,     1,      2,      6,      6),
@@ -285,6 +295,16 @@ static const struct apll_clk_set rk3368_apllb_table[] = {
 
 static const struct apll_clk_set rk3368_aplll_table[] = {
                        /*(_mhz,        nr,     nf,     no,     aclkm,  atclk,  pclk_dbg)*/
+       #ifdef CONFIG_GEEKBOX_OVERCLOCK
+       _RK3368_APLL_SET_CLKS(1992, 1,  83, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1944, 1,  81, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1896, 1,  79, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1848, 1,  77, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1800, 1,  75, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1752, 1,  73, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1704, 1,  71, 1,  2,  7,  7),
+       _RK3368_APLL_SET_CLKS(1656, 1,  69, 1,  2,  7,  7),
+       #endif
        _RK3368_APLL_SET_CLKS(1608,     1,      67,     1,      2,      7,      7),
        _RK3368_APLL_SET_CLKS(1560,     1,      65,     1,      2,      7,      7),
        _RK3368_APLL_SET_CLKS(1512,     1,      63,     1,      2,      7,      7),
diff --git a/geekbox/Kconfig b/geekbox/Kconfig
index d2746bb3..e6aba1e 100644
--- a/geekbox/Kconfig
+++ b/geekbox/Kconfig
@@ -4,5 +4,9 @@ menu "Geekbox Platform Options"
                bool "Ubuntu or other Linux Distros support"
                default n
 
+       config GEEKBOX_OVERCLOCK
+               bool "Overclock support"
+               default n
+
 endmenu
 
(END)

We have pushed the commit to our Github:https://github.com/geekboxzone

2. make a configuration to enable: CONFIG_GEEKBOX_OVERCLOCK

3. setup the frequency & voltage table with your wanna value. 
Following for your reference(in my case i just overclock to 1.85GHz):

CODE: SELECT ALL
file path: arch/arm64/boot/dts/geekbox.dts
&clk_core_b_dvfs_table {     
    operating-points = <     
        /* KHz    uV */      
        //216000 950000      
        312000 950000        
        408000 950000        
        600000 975000        
        696000 975000        
        816000 1000000       
        1008000 1100000      
        1200000 1175000      
        1416000 1300000      
        1488000 1325000      
        1608000 1375000      
        1752000 1400000      
        1848000 1425000      
        >;                   
    status = "okay";         
};                           
                             
&clk_core_l_dvfs_table {     
    operating-points = <     
        /* KHz    uV */      
        //216000 950000      
        312000 950000        
        408000 950000        
        600000 950000        
        696000 975000        
        816000 1050000       
        1008000 1100000      
        1200000 1250000      
        1392000 1300000      
        >;                   
    status = "okay";         
};  

Notice: 
1. higher frequency need match a higher voltage supply.
2. the PMIC of Geekbox is RK808, and the highest voltage output for CPU supply is 1.50V
3. a cooling fan is recommended for a better heat dissipation: https://www.geekbuying.com/item/Slim-High-Speed-Cooling-Fan-for-Geekbox-358271.html

one of the capture information(1.84GHz):

CODE: SELECT ALL
shell@rk3368_box:/ $ cat /sys/kernel/debug/clk/clk_summary | grep core         
    clk_pvtm_core               0           0            24000000  
       clk_hevc_core            1           1            288000000 
       clk_core_l               0           0            600000000 
          atclk_core_l          0           0            200000000 
          aclkm_core_l          0           0            300000000 
       clk_core_b               0           0            1848000000
          atclk_core_b          0           0            308000000 
          aclkm_core_b          0           0            924000000 
shell@rk3368_box:/ $

Sceenshots for references:
1. Antutu v6.0 Benchmark(Test at 1.85GHz):
The attachment geekbox_overclock_scores.png is no longer available

2. core information(Test at 1.85GHz):
The attachment geekbox_overclock_1848MHz.png is no longer available

geekbox_overclock_scores.png (63.22 KiB) Viewed 43 times