From: peter.chen@nxp.com (Peter Chen)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/1] ARM: dts: imx6qdl.dtsi: add "arm, shared-override" for pl310
Date: Tue, 7 Jun 2016 17:39:25 +0800 [thread overview]
Message-ID: <1465292365-26038-1-git-send-email-peter.chen@nxp.com> (raw)
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>
---
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
next reply other threads:[~2016-06-07 9:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 9:39 Peter Chen [this message]
2016-06-11 11:57 ` [PATCH 1/1] ARM: dts: imx6qdl.dtsi: add "arm, shared-override" for pl310 Shawn Guo
2016-06-13 9:15 ` Peter Chen
2016-06-13 9:24 ` Lucas Stach
2016-06-13 9:42 ` Peter Chen
2016-06-13 11:14 ` Lucas Stach
2016-06-14 1:30 ` Peter Chen
2016-06-14 10:11 ` Lucas Stach
2016-06-16 1:02 ` Shawn Guo
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