How to enable imx7ulp mipi-dsi port with tft3p5581e

[Jack_WANG_2022]

Hi,

I debug the official imx7ulp-evk platform. The LCD screen uses tft3p5581e. and the os kernel version is yocto linux-5.10.35.
In the Linux system kernel, when I was enabled the MIPI-DSI driver and configured the DTS parameters, there is nothing display on the screen, but the backlight control and touch work normally.
a part of startup information as follows:
[0.449827] mipi_dsi_northwest 40a90000.mipi_dsi: ----------WL debug---------->starting.
[0.450049] OF: graph: no port node found in /bus@40800000/mipi_dsi@40a90000
[0.450074] mipi_dsi_northwest 40a90000.mipi_dsi:----------WL debug---------->no endpoint, usin.
[0.450109] WL----------------->mxc_dispdrv_register, here.
[0.450132] mipi_dsi_northwest 40a90000.mipi_dsi: i.MX MIPI DSI driver probed
[0.451269] mxsfb 40aa0000.lcdif: supply lcd not found, using dummy regulator
[0.578670] mxsfb 40aa0000.lcdif: Defer fb probe due to dispdrv not ready gpio-reset mipi-dsi-reset: reset-gpio 19, registered(wl).
[2.279188] reg-fixed-voltage regulators:regulator-vsd-3v3: nonexclusive access to GPIO for
regul3
[2.291972] mxsfb 40aa0000.lcdif: supply lcd not found, using dummy regulator
[2.426324] WL DEBUG-------------------------->panel:TRULY-WVGA-TFT3P5581E
TRULY-WVGA-TFT3P5581.
[2.436191] WL DEBUG ------------>mipid_hx8363_get_lcd_videomode, here.
[2.442849] mipi_dsi_northwest 40a90000.mipi_dsi: MIPI DSI dispdv inited
[2.449583] mxsfb 40aa0000.lcdif: registered mxc display driver mipi_dsi_northwest
[2.578038] ------------>MIPI DSI LCD HX8363 setup ...
[2.958114] done.
[3.400212] Console: switching to colour frame buffer device 60x53
[3.516056] mxsfb 40aa0000.lcdif: initialized(wl).

please check the attachment for details.

Thanks!

[AldoG]

Hello,

I would like to know if you have made the proper hardware changes?

Remove resistors: R41 (0 ohm), R43-R46 (0 ohm), R51 (0 ohm)
Populate the resistors: R30-R35 (0 ohm)

You may also refer the base board schematic page 6 note.
https://www.nxp.com/webapp/Download?colCode=IMX7ULP-EVK-DF&appType=license

Best regards,
Aldo.

[Jack_WANG_2022 · Accepted solution]

Hi Aldo,

       It worked normally when I replaced the resistor.
Thank you so much for your support!
Yours sincerely.

Jack WANG