Add display support in u-boot

vishnu_motghare — Tue, 12 Mar 2024 13:24:32 GMT

Hello,

I'm trying to add LCD support in u-boot for a custom IMX6 solo board. I have referred mx6sabresd & enabled the following configuration

CONFIG_DM_VIDEO=y CONFIG_VIDEO_IPUV3=y CONFIG_IMX_VIDEO_SKIP=y

Added panel information on board.c file

static void enable_lvds(struct display_info_t const *dev) { enable_backlight(); } struct display_info_t const displays[] = {{ .bus = -1, .addr = 0, .pixfmt = IPU_PIX_FMT_RGB666, .detect = NULL, .enable = enable_lvds, .mode = { .name = "EDT", .refresh = 60, .xres = 1024, .yres = 600, .pixclock = 15384, .left_margin = 160, .right_margin = 24, .upper_margin = 29, .lower_margin = 3, .hsync_len = 136, .vsync_len = 6, .sync = FB_SYNC_EXT, .vmode = FB_VMODE_NONINTERLACED } } }; size_t display_count = ARRAY_SIZE(displays);

As mentioned in the document, set the panel environment variable

setenv panel EDT saveenv

I'm using the DTS file from Linux, where the display is already working

I see the "drivers/video/nxp/imx/mxc_ipuv3_fb.c" file is responsible for setting up a display framebuffer

In my case, only the ipuv3_video_bind() function is called & ipuv3_video_probe() probe function never gets called.

static int ipuv3_video_bind(struct udevice *dev) { struct video_uc_plat *plat = dev_get_uclass_plat(dev); plat->size = LCD_MAX_WIDTH * LCD_MAX_HEIGHT * (1 << VIDEO_BPP32) / 8; return 0; }

My question is under which condition ipuv3_video_probe() function get called? I know the probe function is only called when the device starts using it but I'm not sure how it work here

Re: Add display support in u-boot

Zhiming_Liu — Wed, 13 Mar 2024 06:04:42 GMT

Hi @vishnu_motghare

Can you check if IPU driver has been compiled in Uboot build process?

Best Regards

Zhiming

Re: Add display support in u-boot

vishnu_motghare — Fri, 22 Mar 2024 11:11:24 GMT

I'm able to probe the driver by setting stdout to 'vidconsole`, ipu driver will be probed when I actually start using the device

setenv stdout vidconsole

I'm also able to probe the driver from board.c file by calling

uclass_get_device(UCLASS_VIDEO, 0, &dev);

topic Add display support in u-boot in i.MX Processors

Add display support in u-boot

Re: Add display support in u-boot

Re: Add display support in u-boot