commit a09d5f747ef59e9b12b9a54983c8d58d71651970
author Madhukar Pappireddy <madhukar.pappireddy@arm.com> Tue Oct 26 14:50:52 2021 -0500
committer Madhukar Pappireddy <madhukar.pappireddy@arm.com> Fri Nov 05 15:35:57 2021 -0500
tree c73ce2f9ba205888aefa0a3a3dfe514e6cc22ee0
parent dd7db24aaf872571b630b46add1995b3bec1b6fd

feat: add helper functions for SP sleep

This patch introduces new helper utilities: virtualcounter_read() and
sp_sleep_elapsed_time() which are further used in sp_sleep() utility.

This patch also adds a needed isb when reading the virtual counter,
to prevent reading stale values, as well as reducing the number of
reads of the virtual counter required. Refer Arm ARM D11.2.2

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: Icaf1777e85ee2efc043bfa83d630edf54bf5a099