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Kernel source tree for Raspberry Pi-provided kernel builds. Issues unrelated to the linux kernel should be posted on the community forum at https://forums.raspberrypi.com/
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i2c_designware 1f00074000.i2c: controller timed out with 2024-03-12 bookworm #6047

Open mgrouch opened 6 months ago

mgrouch commented 6 months ago

Describe the bug

dmesg errors with 2024-03-12 bookworm

[44742.269462] i2c_designware 1f00074000.i2c: controller timed out
[44743.293457] i2c_designware 1f00074000.i2c: controller timed out
[44744.317464] i2c_designware 1f00074000.i2c: controller timed out
[44745.341468] i2c_designware 1f00074000.i2c: controller timed out
[44746.365456] i2c_designware 1f00074000.i2c: controller timed out
[44747.389464] i2c_designware 1f00074000.i2c: controller timed out
[44748.413452] i2c_designware 1f00074000.i2c: controller timed out
[44749.437452] i2c_designware 1f00074000.i2c: controller timed out
[44750.461451] i2c_designware 1f00074000.i2c: controller timed out
[44751.485452] i2c_designware 1f00074000.i2c: controller timed out
[44752.509453] i2c_designware 1f00074000.i2c: controller timed out
[44753.537435] i2c_designware 1f00074000.i2c: controller timed out

Steps to reproduce the behaviour

just let it run with IMU attached

Device (s)

Raspberry Pi 5

System

user@lysmarine:~ $ cat /etc/rpi-issue 
Raspberry Pi reference 2024-03-12
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 9a13a81115a8915885e2cc40fed2092e28894d41, stage2

Logs

No response

Additional context

No response

pelwell commented 6 months ago

There's a PR (#6050) that may help with this issue. Similar failures are seen when the device fails to ACK data in time, and the PR changes the mark/space ratio on SCL to give the device longer to respond at any given clock speed.

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.

mgrouch commented 6 months ago

Is there workaround for an existing released kernel?

Is that due to i2c bus being faster on pi5? Is there a way to slow down i2c bus with some options?

thanks

pelwell commented 6 months ago

Is there workaround for an existing released kernel?

Not really, no, other than to run it slower. You may be able to improve matters by forcing an internal pull-down on SDA (pinctrl 2 pd), but I would advise anyone to upgrade instead.

Is there a way to slow down i2c bus with some options?

The default with dtparam=i2c_arm is 100kHz, which is not fast. Specific overlays may force higher clock speeds.