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24bit LVDS display looks like wrong color depth on custom imx6q

Question asked by Doug Crawford on Jan 17, 2014
Latest reply on Nov 12, 2018 by sunyd@qiyangtech.com

I have a 24bit LVDS display that I am running on a custom imx6q board.  The images look like they are being displayed at the wrong color depth and have some odd horizontal scan line artifacts.

 

I have modified drivers/video/mxc/ldb.c to add a new entry for my display:

static struct fb_videomode ldb_modedb[] = {

  {

  "LG-WVGA", 60, 800, 480, 30066, /*DE mode only. horizontal blanking 256 (85 + 85 + 86), vert blanking 45 (15 + 15 + 15) */

  85, 85,

  15, 15,

  86, 15,

  0,

  FB_VMODE_NONINTERLACED,

  FB_MODE_IS_DETAILED,},

 

I also modified my kernel board file to add a matching entry and made sure to specify IPU_PIX_FMT_RGB24

static struct ipuv3_fb_platform_data qmx6_fb_data[] = {

  { /*fb0*/

.disp_dev = "ldb",
.interface_pix_fmt = IPU_PIX_FMT_RGB24,
.mode_str = "LG-WVGA",
.default_bpp = 32,
.int_clk = false,
.late_init = false,
}, {
.disp_dev = "hdmi",
.interface_pix_fmt = IPU_PIX_FMT_RGB24,
.mode_str = "1920x1080M@60",
.default_bpp = 32,
.int_clk = false,
.late_init = false,
}, {
.disp_dev = "ldb",
.interface_pix_fmt = IPU_PIX_FMT_RGB24,
.mode_str = "LG-WVGA",
.default_bpp = 32,
.int_clk = false,
.late_init = false,
},

};

 

Is there something else I need to setup in u-boot in order to get a 24bit LVDS panel working?  Could this be more related to the custom cable I have connecting the display to the board?

IMG_20140116_153639.jpg

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