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[Ubuntu Foundations Team Bug Bot <1456987@xxxxxxxxxxxxxxxxxx>]

** 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.

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