LVDS resolution Problem agagin

kikimorisato — Thu, 23 Apr 2015 05:15:51 GMT

BSP: fsl-community-bsp (fido branch)

Kernel Version: 3.14.28

Board: SabreSD (mx6q)

LCD: Innolux 1024x600 LVDS

no X11 (frame buffer use)

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

here is my kernel command line

console=ttymxc0,115200 root=/dev/mmcblk2p2 rootwait rw video=mxcfb0:dev=ldb,1024x600M@60

but kernel LVDS set from imx6qdl-sabresd.dtsi

how can i disable it?

i create patch file

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diff -uprN a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi

--- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi 2015-04-22 14:05:06.303517000 +0900

+++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi 2015-04-22 20:45:19.232212412 +0900

@@ -825,7 +825,7 @@

timing0: hsd100pxn1 {

clock-frequency = <65000000>;

hactive = <1024>;

- vactive = <768>;

+ vactive = <600>;

hback-porch = <220>;

hfront-porch = <40>;

vback-porch = <21>;

@@ -847,7 +847,7 @@

timing1: hsd100pxn1 {

clock-frequency = <65000000>;

hactive = <1024>;

- vactive = <768>;

+ vactive = <600>;

hback-porch = <220>;

hfront-porch = <40>;

vback-porch = <21>;

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

kernel LVDS resolution changed 1024x768 to 1024x600

but i want use command line

U-Boot>setenv allow_noncea 1 does not work

Re: LVDS resolution Problem agagin

art — Fri, 24 Apr 2015 08:52:37 GMT

After studying the case in more details, I found the following.

1. Actually, 'allow_noncea=1' environment variable works only for HDMI output.

2. Only limited set of LVDS and parallel LCD video modes is supported in the command line. So, to implement a custom video mode, you have to do it in the device tree, as you did.

Have a great day,
Artur

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