Raspberry Pi 7inch Display, DPI Interface, IPS, 1024×600 nothing was displayed.

2024-09-21 10:20:45 Ask

Thank you for your help.

I connected to a raspberry pi zero wh and set it up on the latest raspberry pi OS as described on this page. I tried several times, but nothing was displayed.

The journal at that time is as follows.

$ sudo journalctl | grep vc4-kms-DPI -> Nothing displayed

$ sudo journalctl | grep vc4-kms-dpi -> Nothing displayed

$ sudo journalctl | grep dpi

Jul 04 09:17:52 raspberrypi kernel: platform panel: Fixed dependency cycle(s) with /soc/dpi@7e208000

Jul 04 09:17:52 raspberrypi kernel: platform 20208000.dpi: Fixed dependency cycle(s) with /panel

Jul 04 09:18:18 raspberrypi kernel: vc4-drm soc:gpu: bound 20208000.dpi (ops vc4_dpi_ops [vc4])

Jul 04 09:20:53 raspberrypi kernel: platform panel: Fixed dependency cycle(s) with /soc/dpi@7e208000 Jul 04 09:20:53 raspberrypi kernel: platform 20208000.dpi: Fixed dependency cycle(s) with /panel Jul 04 09:21:31 raspberrypi kernel: vc4-drm soc:gpu: bound 20208000.dpi (ops vc4_d pi_ops [vc4]) Sep 21 10:52:49 raspberrypi kernel: platform panel: Fixed dependency cycle(s) with /soc/dpi@7e208000 Sep 21 10:52:49 raspberrypi kernel: platform 20208000.dpi: Fixed dependency cycle(s) with /panel Sep 21 10:53:20 raspberrypi kernel: vc4-drm soc:gpu: bound 20208000.dpi (ops vc4_dpi_ops [vc4])

I'm guessing that the vc4-kms-DPI-7inch driver isn't loaded.

However, it is displayed normally on HDMI.

Thank you in advance.

APost Reply

Like0| report

4answers

SpotPearGuest59b61

Answer time:2024-09-21 11:54:37

how do you config it ？

give me your configured code

Like0

report

SpotPearGuestdfdeb

Answer time:2024-09-21 14:25:12

thank you.

/boot/firmware/config.txt

# For more options and information see

# http://rptl.io/configtxt

# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces #

dtparam=i2c_arm=on

#dtparam=i2s=on #

dtparam=spi=on

# Enable audio (loads snd_bcm2835)

dtparam=audio=on

# Additional overlays and parameters are documented

# /boot/firmware/overlays/README

# Automatically load overlays for detected cameras c

amera_auto_detect=1

# Automatically load overlays for detected DSI displays

display_auto_detect=1

# Automatically load initramfs files, if found

auto_initramfs=1

# Enable DRM VC4 V3D driver

dtoverlay=vc4-kms-v3d

max_framebuffers=2

# Don't have the firmware create an initial video= setting in cmdline.txt.

# Use the kernel's default instead.

disable_fw_kms_setup=1

# Disable compensation for displays with overscan

disable_overscan=1

# Run as fast as firmware / board allows

arm_boost=1

[cm4]

# Enable host mode on the 2711 built-in XHCI USB controller.

# This line should be removed if the legacy DWC2 controller is required

# (e.g. for USB device mode) or if USB support is not required.

otg_mode=1

[cm5]

dtoverlay=dwc2,dr_mode=host

[all]

dtoverlay=vc4-kms-v3d

dtoverlay=vc4-kms-DPI-7inch

-----

and I installed

-rwxr-xr-x 1 root root 1556 Feb 14 2022 vc4-kms-DPI-7inch.dtbo

n /boot/firmware/overlays.

Thank you in advance.

Like0

report

SpotPearGuest60f5f

Answer time:2024-09-26 12:01:17

Hello, I looked at your configuration file and found the issue causing the monitor not to display content. The I2C pins and SPI pins are conflicting with the DPI pins. You must disable I2C and SPI to display the DPI monitor properly.

Like0

report

SpotPearGuestdfdeb

Answer time:2024-09-28 13:38:04

Thank you for your advice.

I'm currently testing with i2c and spi disabled.

Please wait a moment.

Like0

report

APost Reply