From: Mubin Usman Sayyed <mubin.usman.sayyed@xilinx.com>
Date: Wed, 5 Sep 2018 11:17:19 +0000 (+0530)
Subject: arm64: zynqmp: Keep SMMU disabled by default
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=76e44aaf40f2bb07df250a8c4f920108df15b64f;p=thirdparty%2Fu-boot.git

arm64: zynqmp: Keep SMMU disabled by default

SMMU adds overhead in mapping/un-mapping of DMA buffers. It
will degrade performance numbers for some of the peripherals.
Disabling SMMU to avoid the same.
Please check Xilinx documentation for more information.

Signed-off-by: Mubin Usman Sayyed <mubin.usman.sayyed@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

diff --git a/arch/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index f4031978975..0bcd6e282ad 100644
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -370,7 +370,7 @@
 		compatible = "arm,mmu-500";
 		reg = <0x0 0xfd800000 0x0 0x20000>;
 		#iommu-cells = <1>;
-		status = "okay";
+		status = "disabled";
 		#global-interrupts = <1>;
 		interrupt-parent = <&gic>;
 		interrupts = <0 155 4>,