tree e8af94fa3c277af1782acea244d71c3e7b6ae611
parent 975d076d4aef260fd9adfbabc6339fe05eed21c1
author Samuel Holland <samuel@sholland.org> 1610783902 -0600
committer Samuel Holland <samuel@sholland.org> 1611530242 -0600

allwinner: psci: Improve system shutdown/reset sequence

- When the SCPI shutdown/reset command returns success, the SCP is
  still waiting for the CPU to enter WFI. Do that.
- Peform board-level poweroff before CPU poweroff. If there is a PMIC
  available, it will turn everything off including the CPUs, so doing
  CPU poweroff first is a waste of cycles.
- During poweroff, attempt to turn off the local CPU using the ARISC.
  This should use slightly less power than just an infinite WFI.
- Drop the WFI in the reset failure path. The panic will hang anyway.

Change-Id: I897efecb3fe4e77a56041b97dd273156ec51ef8e
Signed-off-by: Samuel Holland <samuel@sholland.org>