tree 3dc5cdd9cbc5e67ee10b80162a52d0bf9c8fec67
parent 028c4e42d8f632d40081b88f66d0d05c7d7c9b23
author Boyan Karatotev <boyan.karatotev@arm.com> 1664802428 +0100
committer Boyan Karatotev <boyan.karatotev@arm.com> 1666874812 +0100

fix(cpus): workaround for Neoverse-N2 erratum 2326639

Neoverse-N2 erratum 2326639 is a Cat B erratum that applies to revision
r0p0 and is fixed in r0p1. The workaround is to set CPUACTLR2_EL1[36] to
1 before the power down sequence that sets CORE_PWRDN_EN. This allows
the cpu to retry the power down and prevents the deadlock. TF-A never
clears this bit even if it wakes up from the wfi in the sequence since
it is not expected to do anything but retry to power down after and the
bit is cleared on reset.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN1982442/latest/

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I9a325c5b9b498798e5efd5c79a4a6d5bed97c619