Interfacing

LVDS LeMaker 5" LCD with Kernel 4.x

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Hi Guys,

does anyone of you have activated LCD in u-boot and DeviceTree in Kernel 4.x?
Background is. I was using Bananian till V 16.x. Switched to armbian with Kernel 4.x. Now Kernel isn't using fex - file anymore. So I aksed in armbian forum and got the hint that fex files are no longer supported and I have to activate LCD in u-boot and Devicetree.
I need some support or tutorials.
Would be glad about any hint.
Sry, only info available is for fex file
  1. http://wiki.lemaker.org/BananaPro/Pi:LCD_Module
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You may convert the FEX file to a DTS one.
I found at least this one : https://github.com/mripard/sunxi-babelfish but I didn't test it yet.

Please keep us updated.

Edited by MartinKeppler at Aug 31, 2016 07:26

Hi destroyedlolo,

thanks for reply. I'll begin to test it now and keep you up to date.
I also found some links about changing config for the u-boot to use lcd ...

http://linux-sunxi.org/LCD
http://docs.armbian.com/Developer-Guide_Build-Preparation/
http://docs.armbian.com/Hardware_Allwinner/

But at the moment, I ain't got a clue wich of these thousands of configs in the source I have to use.

Read us soon.

I opended a thread at armbians forum.
You also can follow my way to find a solution here: http://forum.armbian.com/index.p ... -u-boot-kernel-472/

Edited by MartinKeppler at Sep 30, 2016 09:06

So, now I can tell you how to enable LCD in u-boot and DT.

First getting the source of armbian from https://github.com/igorpecovnik/lib
Open the file sources/u-boot/v2016.09/configs/Bananapi_defconfig and add:
  1. CONFIG_VIDEO_LCD_MODE="x:800,y:480,depth:24,pclk_khz:30000,le:40,ri:40,up:29,lo:13,hs:48,vs:3,sync:3,vmode:0"
  2. CONFIG_VIDEO_LCD_POWER="PH12"
  3. CONFIG_VIDEO_LCD_BL_EN="PH8"
  4. CONFIG_VIDEO_LCD_BL_PWM="PB2"
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Now LCD is enabled in u-boot. But it will not switch on backlight, because backlight uses pwm and pwm is disabled per default in DT. So you also have to add in your DTS:
  1. &pwm {
  2.       pinctrl-names = "default";
  3.       pinctrl-0 = <&pwm0_pins_a>, <&pwm1_pins_a>;
  4.       status = "okay";
  5. };
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Ready!
But be aware, LCD only turns on if there is no HDMI Monitor plugged in!!

Ok, hopping some one else of you can use this stuff.

Ludagad  
CONFIG_VIDEO_LCD_MODE="x:800,y:480,depth:24,pclk_khz:30000,le:40,ri:40,up:29,lo:13,hs:48,vs:3,sync:3,vmode:0"


Nice job on finding this info Martin!

Going down the same road myself and there is next to no info. I need to run a non-LeMaker LVDS display, so can you post some links on what the different params stand for?

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