28 Nov
2019
28 Nov
'19
4:14 p.m.
On Thu, Nov 28, 2019 at 5:03 PM Thierry Reding thierry.reding@gmail.com wrote:
From: Thierry Reding treding@nvidia.com
Currently the driver PM core will automatically acquire a runtime PM reference for devices before system sleep is entered. This is needed to avoid potential issues related to devices' parents getting put to runtime suspend at the wrong time and causing problems with their children.
Not only for that.
In some cases drivers are carefully written to avoid such issues and the default behaviour can be changed to allow runtime PM to operate regularly during system sleep.
But this change breaks quite a few assumptions in the core too, so no, it can't be made.
Thanks!