topic Re: linux logo in MIPI DSI in i.MX Processors

linux logo in MIPI DSI

jigneshpatel — Thu, 18 Apr 2019 11:12:52 GMT

I am working on i. MX6 Dualite Processors with linux kernel revision 4.9.88 and Debian file system.

I have interfaced MIPI display.
It directly display xorg screen, linux logo is not displaying.

BSP has a default LVDS interface and changes to MIPI. in LVDS it displays linux logo properly.

Please help me to solve issue of linux logo.

Thanks in advance.

Re: linux logo in MIPI DSI

igorpadykov — Thu, 18 Apr 2019 23:22:32 GMT

Hi Jignesh

one can try to use patch below

Patch to support MIPI display(hx8369) in uboot for i.mx6DL/DQ SebreSD boards

Best regards
igor
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Re: linux logo in MIPI DSI

jigneshpatel — Fri, 19 Apr 2019 04:34:16 GMT

Thanks igor,

For uboot,

I will check uboot patch.

Now my uboot argument is: "setenv videoargs bootargs ${bootargs} video=mxcfb0:dev=mipi_dsi,TRULY-WVGA,if=RGB24;"

For kernel,

My mipi driver is probing perfect because xorg is displayed perfect.
For Displaying logo, I have print debug to verfiy the logo display function.

fbmem.c DEBUG line = 618 fb_prepare_logo : fb_prepare_logo
fbmem.c DEBUG line = 638 fb_prepare_logo : found suitable logo
fbmem.c DEBUG line = 652 fb_prepare_logo : logo xres 480 and yres 800
fbmem.c DEBUG line = 663 fb_prepare_logo : 24 bit logo depth
Console: switching to colour frame buffer device 60x50
fbmem.c DEBUG line = 700 fb_show_logo : fb_show_logo
fbmem.c DEBUG line = 487 fb_show_logo_line : fb_show_logo_line
fbmem.c DEBUG line = 250 fb_set_logo_truepalette : fb_set_logo_truepalette
fbmem.c DEBUG line = 442 fb_do_show_logo : fb_do_show_logo
fbmem.c DEBUG line = 705 fb_show_logo : Logo displayed 80

Above all debug print after MIPI DSI panel initialization.

Please guide me for follwing queries
1. Why my linux logo is not printed?
2. Is uboot patch(MIPI-DSI) is required to display linux kernel logo?

Thanks,
Jignesh Patel

Re: linux logo in MIPI DSI

igorpadykov — Fri, 19 Apr 2019 05:15:45 GMT

Hi Jignesh

nxp does not support debian, please try linux from nxp official repository

linux-imx - i.MX Linux kernel

Best regards
igor