tree 55d2e351725568cb07a98dfb4f787190de836255
parent 6559dbdfb33d70fc1480c0c6e645ee1567fb7eb5
author Boyan Karatotev <boyan.karatotev@arm.com> 1664803288 +0100
committer Boyan Karatotev <boyan.karatotev@arm.com> 1666874812 +0100

fix(cpus): workaround for Cortex-A710 erratum 2291219

Cortex-A710 erratum 2291219 is a Cat B erratum that applies to revisions
r0p0, r1p0, and r2p0, and is fixed in r2p1. 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/SDEN1775101/latest

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I7d3a97dfac0c433c0be386c1f3d2f2e895a3f691