Hi experts,
I have a custom LCD that I connect to an iMX6DL, running Linux 3.10.53.
I made the following adjustments:
(1) Device-tree -- Updated relevant interface parameters. Changed mode_str for mxc_sdc_fb node to hold the new LCD string.
(2) In mxc_lcdif.c -- added new entry to lcdif_modedb[]
It seems the driver attempts to find the LCD mode in the modedb[], but the function 'mxcfb_check_var()' always returns 0.
I enabled DEBUG for device-driver printouts -
mxc_lcdif lcd.26: mxc_lcdif_probe enter
mxc_lcdif lcd.26: mxc_lcdif_probe exit
mxc_sdc_fb fb.25: mxcfb_probe enter
(NULL device *): Mode Str = CUSTOM_LCD
modedb fb_find_mode: mode option = CUSTOM_LCD
modedb fb_find_mode: Trying specified video mode (ignoring refresh rate) 0x0
modedb fb_find_mode: Trying best-fit modes
modedb fb_find_mode: Trying 800x480
modedb fb_try_mode: Trying mode CLAA-WVGA 800x480-4@57
modedb fb_try_mode: calling fb_check_var()
modedb fb_try_mode: Mode CLAA-WVGA -- err = 0
modedb fb_find_mode: Trying 800x480
modedb fb_try_mode: Trying mode SEIKO-WVGA 800x480-4@60
modedb fb_try_mode: calling fb_check_var()
modedb fb_try_mode: Mode SEIKO-WVGA -- err = 0
modedb fb_find_mode: Trying 320x240
modedb fb_try_mode: Trying mode CUSTOM_LCD 320x240-4@60
modedb fb_try_mode: calling fb_check_var()
modedb fb_try_mode: Mode CUSTOM_LCD -- err = 0
modedb fb_find_mode: Trying default video mode
modedb fb_try_mode: Trying mode CLAA-WVGA 800x480-24@57
modedb fb_try_mode: calling fb_check_var()
modedb fb_try_mode: Mode CLAA-WVGA -- err = 0
Any suggestions?
By the way-- if the LCD is defined in the DTB, do I also need to have video=... in bootargs?
Sincerely,
Erez
