plat/nxp: LX2160 errata - enable _delay_exclusive_snoop_A72

Fix a CPU hang in some cases when using load-exclusive/store-exclusive by enabling snoop-delayed exclusive handling in CPUACTLR_EL1

Signed-off-by: Andrew Yong <me@ndoo.sg>

plat/nxp/common/aarch64/ls_helpers.S

@@ -6,8 +6,8 @@
  */
 
 #include <asm_macros.S>
+#include <cortex_a72.h>
 #include <drivers/console.h>
-#include <lib/cpus/aarch64/cortex_a72.h>
 
 #include <platform_def.h>
 
@@ -23,6 +23,7 @@
 	.globl _disable_ldstr_pfetch_A53
 	.globl _disable_ldstr_pfetch_A72
 	.global	_set_smmu_pagesz_64
+	.global _delay_exclusive_snoop_A72
 
 	/* int plat_crash_console_init(void)
 	 * Function to initialize the crash console
@@ -192,3 +193,21 @@ func _set_smmu_pagesz_64
 
 	ret
 endfunc _set_smmu_pagesz_64
+
+func _delay_exclusive_snoop_A72
+        mrs     x0, CORTEX_A72_CPUACTLR_EL1
+        tst     x0, #CORTEX_A72_CPUACTLR_EL1_DELAY_EXCLUSIVE_SNOOP
+        b.eq    1f
+        b       2f
+
+.align 6
+1:
+        dsb     sy
+        isb
+        orr     x0, x0, #CORTEX_A72_CPUACTLR_EL1_DELAY_EXCLUSIVE_SNOOP
+        msr     CORTEX_A72_CPUACTLR_EL1, x0
+        isb
+
+2:
+        ret
+endfunc _delay_exclusive_snoop_A72

plat/nxp/soc-lx2160a/aarch64/lx2160a_helpers.S

@@ -27,7 +27,6 @@ endfunc	platform_mem_init
 
 
 func apply_platform_errata
-
 	ret
 endfunc apply_platform_errata
 
@@ -37,6 +36,7 @@ func plat_reset_handler
 	bl  apply_platform_errata
 
 #if defined(IMAGE_BL31)
+    bl _delay_exclusive_snoop_A72
 	ldr x0, =POLICY_SMMU_PAGESZ_64K
 	cbz x0, 1f
 	/* Set the SMMU page size in the sACR register */