fix(cpus): workaround for Cortex-A715 erratum 2331818
Cortex-A715 erratum 2331818 is a cat B erratum that applies to
revisions r0p0 and r1p0 and is fixed in r1p1. The workaround is to
set bit[20] of CPUACTLR2_EL1. Setting this bit is expected to have
a negligible performance impact.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN2148827/latest
Change-Id: If3b1ed78b145ab6515cdd41135314350ed556381
Signed-off-by: Bipin Ravi <biprav01@u203721.austin.arm.com>
diff --git a/lib/cpus/aarch64/cortex_a715.S b/lib/cpus/aarch64/cortex_a715.S
index a9bb370..65f3c04 100644
--- a/lib/cpus/aarch64/cortex_a715.S
+++ b/lib/cpus/aarch64/cortex_a715.S
@@ -26,6 +26,12 @@
wa_cve_2022_23960_bhb_vector_table CORTEX_A715_BHB_LOOP_COUNT, cortex_a715
#endif /* WORKAROUND_CVE_2022_23960 */
+workaround_reset_start cortex_a715, ERRATUM(2331818), ERRATA_A715_2331818
+ sysreg_bit_set CORTEX_A715_CPUACTLR2_EL1, BIT(20)
+workaround_reset_end cortex_a715, ERRATUM(2331818)
+
+check_erratum_ls cortex_a715, ERRATUM(2331818), CPU_REV(1, 0)
+
workaround_reset_start cortex_a715, ERRATUM(2420947), ERRATA_A715_2420947
sysreg_bit_set CORTEX_A715_CPUACTLR2_EL1, BIT(33)
workaround_reset_end cortex_a715, ERRATUM(2420947)
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 5bdd9e4..1c0b092 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -911,6 +911,10 @@
# This erratum applies to revisions r0p0, r0p1. Fixed in r0p2.
CPU_FLAG_LIST += ERRATA_V2_2801372
+# Flag to apply erratum 2331818 workaround during reset. This erratum applies
+# to revisions r0p0 and r1p0. It is fixed in r1p1.
+CPU_FLAG_LIST += ERRATA_A715_2331818
+
# Flag to apply erratum 2420947 workaround during reset. This erratum applies
# only to revision r1p0. It is fixed in r1p1.
CPU_FLAG_LIST += ERRATA_A715_2420947