DSI panel timing calculation question


#1

i’m now doing a panel porting to 410c and using xml file that included in porting guide to set the parameter.
There are two parameters, “Escclk source” and “MMSS_CC ESCCLK PREDIV” that i have no idea what’s that about.
Does anyone have the idea or have experience on the dsi porting. Thanks!


#2

which xml file? this is for android or linux? panel?


#3

By following this file: https://developer.qualcomm.com/download/db410c/dsi-display-porting-guide-linux-android.zip
i’m trying to port for android system


#4

You can keep these values constant and proceed

Escclk source (mxo = 27MHz, pxo = 24MHz, cxo = 19.2MHz) - 19.2 MHz
MMSS_CC ESCCLK PREDIV - 1


#5

Thanks for your answer, but the panel is still not lights up. I’ve already check the byteclk and pclk by reading the measure value under /sys/kernel/debug/… and they shows the same as the calculated value.
Would you share some of you experience on porting the dsi panel, eg. debug procedure?


#6

which panel are you using (cmd mode or video mode)? required regulators and gpios are added properly? Does the backlight gpio/pwm is handled?


#7

I’m actually porting a projection display in video mode, the panel is driving by another mcu for initialization, backlight control, and even the reset pin.
What the vendor provides the on/off command and the parameters like HFP HBP etc. And they claim that the screen will light up if the dsi signal gets correctly.


#8

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#9

@spele1100 I’m busy with something very similar to you. Did you ever get this right?