From mboxrd@z Thu Jan 1 00:00:00 1970 From: peter.chen@nxp.com (Peter Chen) Date: Tue, 7 Jun 2016 17:39:25 +0800 Subject: [PATCH 1/1] ARM: dts: imx6qdl.dtsi: add "arm, shared-override" for pl310 Message-ID: <1465292365-26038-1-git-send-email-peter.chen@nxp.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- arch/arm/boot/dts/imx6qdl.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi index ed613eb..30e21ee 100644 --- 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 at 0x01000000 { -- 1.9.1