Connect LVDS Display to imx6 dual lite

[emmanuelperea]

Hello,

I am working with a imx6 dual lite digi board. I need to use a LVDS custom display.

I used the kit's display that digi provides and worked fine but when I want to use other monitors those don't work.

When I connect one of those displays It shows dark image, another display that I connect don't show anything.

The dtb file has the next configuration:

&ldb {     lvds-channel@0 {         fsl,data-mapping = "spwg";         fsl,data-width = <18>;           display-timings {             native-mode = <&g101evn010_1>;               /* Fusion 10" F10A-0102 */             hsd101pfw2_1: timing@0 {                 clock-frequency = <45000000>;                 hactive = <1024>;                 vactive = <600>;                 hfront-porch = <0>;                 hback-porch = <0>;                 hsync-len = <176>;                 vback-porch = <0>;                 vfront-porch = <0>;                 vsync-len = <25>;             };               /* AUO G101EVN01.0 */             g101evn010_1: timing@1 {                 clock-frequency = <68930000>;                 hactive = <1280>;                 vactive = <800>;                 hfront-porch = <120>;                 hback-porch = <0>;                 hsync-len = <8>;                 vback-porch = <10>;                 vfront-porch = <0>;                 vsync-len = <6>;                 hsync-active = <1>;                 vsync-active = <1>;                 de-active = <1>;                 pixelclk-active = <0>;             };         };     };

I changed timing@1 configuration, hactive, vactive and clock-frequency but the display It shows the same way.
I read that maybe can be backlight configuration but I put a backlight configuration but Its not made difference, I dont know if I did it well.
I have a 4.6 kernel version.
I have to use a lvds-hdmi hardware adapter I dont know if tuhis is the problem.
If someone can help me.
Regards.

[igorpadykov]

Hi emmanuel

digi has blog on that subject

Adding a custom display 

also one can try nxp linux from linux-imx - i.MX Linux kernel 

and use nxp community useful links like:

How to change SABRE-SD screen resolution in LOLLIPOP(5.0.0? 

Best regards
igor
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[emmanuelperea]

Hi Igor,

Thanks for reply,

Yes I have read the digi documentation about adding a custom display, I have read my displays documentation and I have made the configuration in dtb, I think that I have made well.

Display datasheet has the next values:

------------------------------------------------------------------------------------

vertical section: period -> Min = 1034 , Typ = 1066, Max = 2048

                           Active -> Min = 1024, Typ = 1024, Max = 1024

                           Blanking -> Min = 10, Typ = 42, Max = 1024

---------------------------------------------------------------------------------------

Horizontal section: period -> Min = 750 , Typ = 844, Max = 2048

                           Active -> Min = 640, Typ = 640, Max = 640

                           Blanking -> Min = 110, Typ = 204, Max = 1408

----------------------------------------------------------------------------------------

Clock: Frequency: Min = 40, Typ = 54, Max = 70 (MHz)

Frame Rate: Min = 49, Typ = 60, Max = 76 (Hz)

----------------------------------------------------------------------------------------

So in the dtb file I did:

                        clock-frequency = <54000000>;
                            hactive = <1024>;
                            vactive = <640>;
                            hfront-porch = <0>;
                            hback-porch = <0>;
                            hsync-len = <204>;
                            vback-porch = <0>;
                            vfront-porch = <0>;
                            vsync-len = <42>;

But the display dont works.

I am usin a lvds to hdmi adapter, I use the lvds connector of imx6 but is connected to hdmi display connector, I dont know if is for this reason that the diplay is not working.

You have some idea to fix this?

Thanks,

Regards

Emmanuel

[emmanuelperea]

Sorry dtb text pasted badly, here is:

&ldb {     
   lvds-channel@0 {         
         fsl,data-mapping = "spwg";         
         fsl,data-width = <18>;           
         display-timings {             
            native-mode = <&g101evn010_1>;               
         /* Fusion 10" F10A-0102 */             
         hsd101pfw2_1: timing@0 {                 
            clock-frequency = <45000000>;                 
            hactive = <1024>;                 
            vactive = <600>;               
            hfront-porch = <0>;                 
            hback-porch = <0>;                 
            hsync-len = <176>;                 
            vback-porch = <0>;                 
            vfront-porch = <0>;                 
            vsync-len = <25>;             
};               
       /* AUO G101EVN01.0 */            
       g101evn010_1: timing@1 {                
          clock-frequency = <68930000>;                 
          hactive = <1280>;                 
          vactive = <800>;                 
          hfront-porch = <120>;                 
          hback-porch = <0>;                 
          hsync-len = <8>;                 
          vback-porch = <10>;                 
          vfront-porch = <0>;                 
          vsync-len = <6>;                 
          hsync-active = <1>;                
          vsync-active = <1>;                 
         de-active = <1>;                
       pixelclk-active = <0>;             
      };         
   };     
};