Tegra210: disable ERRATA_A57_829520

ERRATA_A57_829520 disables "indirect branch prediction" for
EL1 on cpu reset, leading to 15% drop in CPU performance
with coremark benchmarks.

Tegra210 already has a hardware fix for ARM BUG#829520,so
this errata is not needed.

This patch disables the errata to get increased performance
numbers.

Change-Id: I0b42e8badd19a8101f6a55d80eb2d953597d3c20
Signed-off-by: Mithun Maragiri <mmaragiri@nvidia.com>

diff --git a/plat/nvidia/tegra/soc/t210/platform_t210.mk b/plat/nvidia/tegra/soc/t210/platform_t210.mk
index 0d27bcdc5570f8c217895deb01ecd2bf06314c1f..ba827a07341c2dcd2e2004826f1bb5b3b85ffa2e 100644 (file)
--- a/plat/nvidia/tegra/soc/t210/platform_t210.mk
+++ b/plat/nvidia/tegra/soc/t210/platform_t210.mk
@@ -46,7 +46,6 @@ A57_DISABLE_NON_TEMPORAL_HINT :=      1
 ERRATA_A57_826974              :=      1
 ERRATA_A57_826977              :=      1
 ERRATA_A57_828024              :=      1
-ERRATA_A57_829520              :=      1
 ERRATA_A57_833471              :=      1
 
 # Enable workarounds for selected Cortex-A53 erratas.