tree d0abc1dc30bbbed03b0ae8ae4f7688f60a9e950c
parent 572a905143f61e6456bb7713dee8b01a4948e196
author Shawn McCarney <shawnmm@us.ibm.com> 1617118717 -0500
committer Shawn McCarney <shawnmm@us.ibm.com> 1617733254 +0000

regulators: Wait for compatible system types

There are two options for naming the JSON configuration file:
1. Default name
2. Name based on compatible system types provided by EntityManager

If option #2 is used, there is no guarantee that EntityManager will have
published the compatible systems types on D-Bus before a boot is
attempted.  This is not common, but the problem has occurred.

When the boot begins, the regulators application configures the voltage
regulators.  If the config file has not been found and loaded, this
configuration cannot occur.

This commit enhances the regulators application to wait for
EntityManager to publish the compatible systems information during the
boot so that the regulators can be configured.

A maximum wait time is enforced to prevent the boot from being blocked
indefinitely.  If this maximum wait time is reached, a critical error is
logged indicating that the voltage regulators could not be configured.

Tested:
* System types available before boot
* Have to wait for system types during boot
  * System types found within 5 minutes
  * System types not found within 5 minutes
* For complete test plan details, see
  https://gist.github.com/smccarney/b059a5f4da1a9138af770217cbafaea3

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I700a376b94603f36defd1fe266c0a2d7e2a9d30b