ARM: dts: imx6qdl.dtsi: add "arm,shared-override" for pl310

The imx6 SMP system has the same DMA memory coherency issue [1] with
pl310 L2 controller. With this shared override bit set, the customer
reports the DMA coherency issue is gone. Besides, I have tested
the performance using USB ethernet with/without this bit, it shows
no difference.

[1] http://patchwork.ozlabs.org/patch/469362/

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index b20096f..b620ac8 100644 (file)
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -185,6 +185,7 @@
                        cache-level = <2>;
                        arm,tag-latency = <4 2 3>;
                        arm,data-latency = <4 2 3>;
+                       arm,shared-override;
                };
 
                pcie: pcie@0x01000000 {