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From: b38611@freescale.com (Fugang Duan)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: imx6: enable pl310 "shared attribute override enable" bit
Date: Thu, 21 Jan 2016 11:28:58 +0800	[thread overview]
Message-ID: <1453346938-5625-1-git-send-email-b38611@freescale.com> (raw)

The default behavior of the L220 or PL310 cache controllers with respect
to the shareable attribute is to transform "normal memory non-cacheable
transactions" into "cacheable no allocate" (for reads) or "write through
no write allocate" (for writes).

On i.MX6 series platforms, enet/audio/usb/nand DMA buffer have corruption
without CMA. So set this property "arm,shared-override" in L2 dts node to
enable "shared attribute override enable" bit.

Signed-off-by: Fugang Duan <B38611@freescale.com>
---
 arch/arm/boot/dts/imx6qdl.dtsi | 1 +
 arch/arm/boot/dts/imx6sl.dtsi  | 1 +
 arch/arm/boot/dts/imx6sx.dtsi  | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index 4f6ae92..b4de39a 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 {
diff --git a/arch/arm/boot/dts/imx6sl.dtsi b/arch/arm/boot/dts/imx6sl.dtsi
index d12b250..3b80b45 100644
--- a/arch/arm/boot/dts/imx6sl.dtsi
+++ b/arch/arm/boot/dts/imx6sl.dtsi
@@ -113,6 +113,7 @@
 			cache-level = <2>;
 			arm,tag-latency = <4 2 3>;
 			arm,data-latency = <4 2 3>;
+			arm,shared-override;
 		};
 
 		pmu {
diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
index a5f7602..42f8f3b 100644
--- a/arch/arm/boot/dts/imx6sx.dtsi
+++ b/arch/arm/boot/dts/imx6sx.dtsi
@@ -155,6 +155,7 @@
 			cache-level = <2>;
 			arm,tag-latency = <4 2 3>;
 			arm,data-latency = <4 2 3>;
+			arm,shared-override;
 		};
 
 		dma_apbh: dma-apbh at 01804000 {
-- 
1.9.1

             reply	other threads:[~2016-01-21  3:28 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-21  3:28 Fugang Duan [this message]
2016-01-21  5:08 ` [PATCH] ARM: dts: imx6: enable pl310 "shared attribute override enable" bit Stefan Agner
2016-01-21  9:21   ` Lucas Stach
2016-01-22  4:43     ` Stefan Agner
2016-01-21  9:20 ` Lucas Stach
2016-01-21  4:40 Fugang Duan

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