[PATCH 1/1] ARM: dts: imx6qdl.dtsi: add "arm, shared-override" for pl310
From: shawnguo@kernel.org (Shawn Guo)
Date: 2016-06-11 11:57:33
+ Lucas On Tue, Jun 07, 2016 at 05:39:25PM +0800, Peter Chen wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- 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;
Lucas had an objection to the change [1], considering the case that kernel is booted as non-secure. Shawn [1] http://thread.gmane.org/gmane.linux.ports.arm.kernel/471026
};
pcie: pcie at 0x01000000 {
--
1.9.1
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