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    • Mark Brown's avatar
      regulator: Defer init completion for a while after late_initcall · 55576cf1
      Mark Brown authored
      The kernel has no way of knowing when we have finished instantiating
      drivers, between deferred probe and systems that build key drivers as
      modules we might be doing this long after userspace has booted. This has
      always been a bit of an issue with regulator_init_complete since it can
      power off hardware that's not had it's driver loaded which can result in
      user visible effects, the main case is powering off displays. Practically
      speaking it's not been an issue in real systems since most systems that
      use the regulator API are embedded and build in key drivers anyway but
      with Arm laptops coming on the market it's becoming more of an issue so
      let's do something about it.
      
      In the absence of any better idea just defer the powering off for 30s
      after late_initcall(), this is obviously a hack but it should mask the
      issue for now and it's no more arbitrary than late_initcall() itself.
      Ideally we'd have some heuristics to detect if we're on an affected
      system and tune or skip the delay appropriately, and there may be some
      need for a command line option to be added.
      
      Link: https://lore.kernel.org/r/20190904124250.25844-1-broonie@kernel.org
      
      
      Signed-off-by: Mark Brown's avatarMark Brown <broonie@kernel.org>
      Tested-by: default avatarLee Jones <lee.jones@linaro.org>
      Cc: stable@vger.kernel.org
      55576cf1
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