overclocked the display of my old phone LOL

[henry69420]

Was playing around with the open source released samsung kernel for the phone. found that you can edit the display refresh rate in the linux dts for the exynos7870 board.

 

how high does it overclock?

 

I don't know but samsung defines max 2560 * 1600 * 4 * 60 in short 2560*1600 at 60 fps max line rate. this phone uses 720p

so by using math we can get: 2560 * 1600 * 4 * 60 = 1280 * 720 * 4 * x

in this case x would be 266.666... hz, but i have not tested that yet.

i did calculate all the values for it to be 120hz tho and it seems to be working fine

 

(you can't see the black stripes with real eyes only with camera)

 

[Cababido]

Sheesh gj ngl hahahah

[Levent]

3 minutes ago, henry69420 said:

i did calculate all the values for it to be 120hz tho and it seems to be working fine

No mention of how testing was done or even proof that it works. Yeah imma believe that one.

[henry69420]

Just now, Levent said:

No mention of how testing was done or even proof that it works. Yeah imma believe that one.

// data from dts
disp-pll-clk = <64000000>;
disp-vclk = <64000000>;
/* HBP HFP HSW */
timing,h-porch = <48 56 4>;
/* VBP VFP VSW */
timing,v-porch = <5 9 2>;
vertical pixels 1280
horizontal pixels 720

// pro calculations
// total horizontal lines
720+48+56+4=828
// total vertical lines
1280+5+9+2=1296
// get refresh rate
64000000/(1296x828)=59.64Hz default

 

soooo you can see if i increase disp-pll-clk and disp-vclk the refresh rate is higher.

but i also need to increase bandwidth rate and for that idk how to get so i increased it until it works

[Levent]

Just now, henry69420 said:

soooo you can see if i increase disp-pll-clk and disp-vclk the refresh rate is higher.

but i also need to increase bandwidth rate and for that idk how to get so i increased it until it works

So? have you tested how long it takes for a frame to display or if display skips frames with slow motion video recording? Sure board can handle it as it uses LVDS but can the panel?

[henry69420]

1 minute ago, Levent said:

So? have you tested how long it takes for a frame to display or if display skips frames with slow motion video recording? Sure board can handle it as it uses LVDS but can the panel?

i have not seen any frame skipping

i cant record at 120 fps to send a video but i used another test in that webpage and the ufo moving at 120 fps seemed smoother then one at 74 and 60