i.MX ProcessorsのトピックRe: imx6 not work correctly with LVDS 1366x768

imx6 not work correctly with LVDS 1366x768

mohsen2013 — Wed, 14 Dec 2016 11:00:41 GMT

i use kernel linux-rel_imx_4.1.15_2.0.0_ga, when i set hactive=1366 in dts, i face with "EGL Error : Could not create the egl surface: error = "0x3003" in my qt app, but if i set hactive=1368 it will work correctly, except that i have a white or black rectangle in left side of lcd from top to bottom with 8 pixel with!!!

i searched and find that ipu may only able to work with module 8 of hactive, is it true and how can i solve this problem?

Re: imx6 not work correctly with LVDS 1366x768

igorpadykov — Wed, 14 Dec 2016 23:38:30 GMT

Hi moh

1366x768 resolution doesn't work with the IPU and GPU because that resolution is not multiple of 8.

Also please check

https://community.nxp.com/thread/272026

Best regards
igor
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Re: imx6 not work correctly with LVDS 1366x768

mohsen2013 — Thu, 15 Dec 2016 07:41:04 GMT

Is blank area in left side of LVDS related to this problem?

Re: imx6 not work correctly with LVDS 1366x768

igorpadykov — Thu, 15 Dec 2016 09:39:54 GMT

you can change screen width to 1360 and if blank area will persist,

then this not relates to this problem.

Re: imx6 not work correctly with LVDS 1366x768

trsystems — Fri, 16 Dec 2016 10:19:32 GMT

Maybe I had a similar problem 1366x768 displays. My solution was to patch the kernel and now it's working. Hier is a part of my patch:

--- linux-4.1.15-FS1.2.0-rt18/drivers/video/fbdev/core/modedb.c   2016-08-29 11:10:17.000000000 +0200
+++ linux-4.1.15-FS1.2.0-trs/drivers/video/fbdev/core/modedb.c   2016-10-11 14:28:14.000000000 +0200
@@ -928,8 +928,27 @@ void fb_videomode_to_var(struct fb_var_s
{
    var->xres = mode->xres;
    var->yres = mode->yres;
-   var->xres_virtual = mode->xres;
-   var->yres_virtual = mode->yres;
+
+   if((mode->xres % 32) != 0) {
+      var->xres_virtual = ((mode->xres / 32) + 1) * 32;
+   }
+   else {
+      var->xres_virtual = mode->xres;
+   }
+
+   if((mode->yres % 32) != 0) {
+      var->yres_virtual = ((mode->yres / 32) + 1) * 32;
+   }
+   else {
+      var->yres_virtual = mode->yres;
+   }
+
    var->xoffset = 0;
    var->yoffset = 0;
    var->pixclock = mode->pixclock;