i2c_designware: controller timed out when DSI LCD is plugged in #5988
Comments
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You already have a discussion going on the forums over this - https://forums.raspberrypi.com/viewtopic.php?t=366281. Please don't duplicate issues between the forums and Github, and certainly not without providing a link to the other discussion, otherwise you just waste other people's time. |
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Problem is fixed when Linux kernel is downgraded to 6.1.63 (official Bookworm kernel version that worked). I guess the fixes in i2c_designware that was introduced after 6.1.63 doesn't really get along with some of the devices. |
I encountered the same issue as you, and when I ran the fix by @pelwell, the problem was perfectly resolved: You can install a trial, beta kernel containing the fix by running sudo rpi-update pulls/6050. Take care to back up any important data in your image before updating in case there is a regression." |
Describe the bug
Hi,
I am working on a Yocto-based distro where I want to interface Pi 5 with Waveshare DSI 4.3 inch display. (Rev 2.1)
Unfortunately, so far wasn't able to get past the following backlight problem and somehow i2c controller looks timed out when I plug the module in:
It seems based on logs that at least DSI panel is recognized but this backlight / i2c_designware is the issue.
Since I dont have much Pi 5 specific knowledge I wanted to ask about you guys' opinions. What do you think the problem might be? I didn't try this in the default Raspbian OS but Waveshare website says it works with Pi 5.
DSI LCD seem to work on Bookworm (6.1.63), but when I compile kernel from here (6.1.74 or 6.1.77) it just doesn't work on a custom kernel. I am forgetting something for sure.
I would really appreciate if people with the knowledge could help here. Thanks in advance.
Steps to reproduce the behaviour
I am compiling raspberrypi kernel 6.1.77 from rpi-6.1.y branch where the last commits is with hash afd5f65.
Plugging in Waveshare DSI 4.3 Capacitive to the DSI1.
and set the following config:
Device (s)
Raspberry Pi 5
System
raspberrypi kernel 6.1.77 from rpi-6.1.y branch where the last commits is with hash afd5f65.
Yocto-based custom distro
Linux raspberrypi5_custom 6.1.77-v8-16k #1 SMP PREEMPT Tue Feb 20 18:18:05 UTC 2024 aarch64 GNU/Linux
Logs
Here is the output of raspinfo (some of it):
Here is the output from i2cdetect -y 4 where DSI1 i2c should be:
Here are some extra kernel config options I am enabling:
Here is output from xrandr:
lsmod when the problem occurs:
lsmod from Bookworm when it actually works:
Additional context
No response
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