Hi,
Not sure if this is the right place to report this, but since we
noticed it via an update to
the meta-ti layer, I thought I'd start here.
We noticed that reading the bandgap temperature sensors stopped working when
the ti kernel was updated to 5.4.52 with this commit:
$ git log -1 346017b313e7c2a376724f71c1b2559fbdc221da
commit 346017b313e7c2a376724f71c1b2559fbdc221da (refs/bisect/bad)
Author: Denys Dmytriyenko <[email protected]>
Date: Fri Jul 31 00:27:08 2020 +0000
linux-ti-staging: update to 5.4.52
Signed-off-by: Denys Dmytriyenko <[email protected]>
After that change, we see this output:
# cat /sys/class/thermal/thermal_zone*/type
cpu_thermal
gpu_thermal
core_thermal
dspeve_thermal
iva_thermal
board_thermal
bq27000-battery
# cat /sys/class/thermal/thermal_zone*/temp
cat: /sys/class/thermal/thermal_zone0/temp: Invalid argument
cat: /sys/class/thermal/thermal_zone1/temp: Invalid argument
cat: /sys/class/thermal/thermal_zone2/temp: Invalid argument
cat: /sys/class/thermal/thermal_zone3/temp: Invalid argument
cat: /sys/class/thermal/thermal_zone4/temp: Invalid argument
30187
cat: /sys/class/thermal/thermal_zone6/temp: No such device
After a little bit of digging, it looks like this commit in the main
line stable kernel
causes the breakage:
https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/commit/?h=ti-linux-5.4.y&id=ea78361174c4746e8df8e6fdc0ec1dc710a6869d
After reverting that commit and adding the reverted commit as a patch to our
bbappend for the kernel, we're seeing the expected results:
# cat /sys/class/thermal/thermal_zone*/temp
47400
48200
47800
46200
47800
39937
cat: /sys/class/thermal/thermal_zone6/temp: No such device
We are seeing this using a BeagleBone X15 board. Our MACHINE config
is based on conf/machine/include/dra7xx.inc.
# uname -a
Linux viper-x15 5.4.58-gda26e63e96 #1 SMP PREEMPT Tue Aug 18
18:29:57 UTC 2020 armv7l armv7l armv7l GNU/Linux
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