topic Re: LVDS issue in i.MX Processors

LVDS issue

lifusong — Thu, 04 Jun 2015 06:29:56 GMT

dear sir.

our lvds can who something.but ,have some problem,please see below pic.

how to fix this.

our lvds work on 800x480 18bit ,boot args is video=mxcfb0:dev=ldb,if=RGB666,fbpix=RGB24 vmalloc=400M,

and use if=rgb24,this image is more worse.

Re: LVDS issue

igorpadykov — Thu, 04 Jun 2015 11:30:26 GMT

Hi li

for 800x480 lvds settings one can look at nitrogen board

Universal Boot Loader general discussion ()

[PATCH 17/32] nitrogen6x: display: add wvga-lvds panel

Theory&Example :

AN3974 Different Display Configurations on i.MX35 Linux PDK

how to support WSVGA output in imx6sdq

Best regards

igor

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Re: LVDS issue

lifusong — Fri, 05 Jun 2015 01:41:38 GMT

Dear sir.

in that link.Universal Boot Loader general discussion ()

what is the base version?

I can't found the match line in u-boot 2014.04

Re: LVDS issue

lifusong — Fri, 05 Jun 2015 02:40:31 GMT

our board is mx6q,and android version is 4.4.3_r1. kernel 3.10.53 u-boot 2014.04

below is the u-boot seting.

static struct display_info_t const displays[] = {{

.bus = -1,

.addr = 0,

.pixfmt = IPU_PIX_FMT_RGB666,

.detect = NULL,

.enable = NULL,

.mode = {

.name = "Hannstar-XGA",

.refresh = 60,

.xres = 800,//1024,

.yres = 480,//768,

.pixclock = 19531,//15385,

.left_margin = 160,//220,

.right_margin = 160,//40,

.upper_margin = 18,//21,

.lower_margin = 18,//7,

.hsync_len = 60,

.vsync_len = 10,

.sync = FB_SYNC_EXT,

.vmode = FB_VMODE_NONINTERLACED

} }

below is the kernel device tree seting

	lvds-channel@0 {
		crtc = "ipu2-di0";
		status = "okay";
		fsl,data-mapping = "spwg";
		fsl,data-width = <18>;

	display-timings {
		native-mode = <&timing0>;
		timing0: hsd100pxn1 {
			clock-frequency = <65000000>;
			hactive = <800>;
			vactive = <480>;
			hback-porch = <160>;
			hfront-porch = <160>;
			vback-porch = <18>;
			vfront-porch = <18>;
			hsync-len = <60>;
			vsync-len = <10>;
		};
	};
};