** Tags added: patch
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https://bugs.launchpad.net/bugs/1456987
Title:
beaglebone: warning "cpu cpu0: cpu0 regulator not ready, retry" during
boot
Status in linux package in Ubuntu:
Incomplete
Bug description:
SRU Justification:
Impact: during boot, the logs are spammed with several repeated
warning messages.
Fix: apply the patches, recompile and reboot.
Testcase: try booting with and without the patches applied and see
if you can find the below warning messages in your logs.
---
From dmesg:
...
[ 2.583310] cpu cpu0: cpu0 regulator not ready, retry
[ 2.588716] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 2.612048] bL_switcher_halve_cpus: no CPU pairing possible
[ 2.786225] cpu cpu0: cpu0 regulator not ready, retry
[ 2.791644] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 2.820171] cpu cpu0: cpu0 regulator not ready, retry
[ 2.825579] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 2.880831] cpu cpu0: cpu0 regulator not ready, retry
[ 2.891547] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 2.909836] cpu cpu0: cpu0 regulator not ready, retry
[ 2.915227] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 7.437203] cpu cpu0: cpu0 regulator not ready, retry
[ 7.470228] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 8.117120] cpu cpu0: cpu0 regulator not ready, retry
[ 8.136001] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 8.368726] cpu cpu0: cpu0 regulator not ready, retry
[ 8.383608] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 8.497935] cpu cpu0: cpu0 regulator not ready, retry
[ 8.514540] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 8.604475] cpu cpu0: cpu0 regulator not ready, retry
[ 8.619969] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 9.249407] cpu cpu0: cpu0 regulator not ready, retry
[ 9.265457] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 9.393519] cpu cpu0: cpu0 regulator not ready, retry
[ 9.411153] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 9.411513] cpu cpu0: cpu0 regulator not ready, retry
[ 9.445954] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
[ 9.664395] cpu cpu0: cpu0 regulator not ready, retry
[ 9.684708] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe
deferral
...
that's because the cpufreq-cpu0 driver (that's built-in) requires the
tsp65217 regulator driver that is compiled as a module (and not
available during boot).
While it's only a warning and it goes away when the rootfs is mounted
(and the tps65217_regulator module is loaded), it's annoying and it
spams the syslog.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1456987/+subscriptions
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