fix(cpus): workaround for Cortex-A720 erratum 2844092
Cortex-A720 erratum 2844092 is a Cat B erratum that is present
in revisions r0p0, r0p1 and is fixed in r0p2.
The workaround is to set bit[11] of CPUACTLR4_EL1 register.
SDEN documentation:
https://developer.arm.com/documentation/SDEN-2439421/latest
Change-Id: I3d8eacb26cba42774f1f31c3aae2a0e6fecec614
Signed-off-by: Sona Mathew <sonarebecca.mathew@arm.com>
diff --git a/lib/cpus/aarch64/cortex_a720.S b/lib/cpus/aarch64/cortex_a720.S
index 53a1b78..3e2927b 100644
--- a/lib/cpus/aarch64/cortex_a720.S
+++ b/lib/cpus/aarch64/cortex_a720.S
@@ -26,6 +26,12 @@
wa_cve_2022_23960_bhb_vector_table CORTEX_A720_BHB_LOOP_COUNT, cortex_a720
#endif /* WORKAROUND_CVE_2022_23960 */
+workaround_reset_start cortex_a720, ERRATUM(2844092), ERRATA_A720_2844092
+ sysreg_bit_set CORTEX_A720_CPUACTLR4_EL1, BIT(11)
+workaround_reset_end cortex_a720, ERRATUM(2844092)
+
+check_erratum_ls cortex_a720, ERRATUM(2844092), CPU_REV(0, 1)
+
workaround_reset_start cortex_a720, ERRATUM(2926083), ERRATA_A720_2926083
/* Erratum 2926083 workaround is required only if SPE is enabled */
#if ENABLE_SPE_FOR_NS != 0
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index c06bf9e..c9ff110 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -956,6 +956,10 @@
# only to revision r0p0, r1p0 and r1p1. It is fixed in r1p2.
CPU_FLAG_LIST += ERRATA_A715_2728106
+# Flag to apply erratum 2844092 workaround during reset. This erratum applies
+# to revisions r0p0 and r0p1. It is fixed in r0p2.
+CPU_FLAG_LIST += ERRATA_A720_2844092
+
# Flag to apply erratum 2926083 workaround during reset. This erratum applies
# to revisions r0p0 and r0p1. It is fixed in r0p2.
CPU_FLAG_LIST += ERRATA_A720_2926083