linux-kernel - [PATCH v2 3/4] ARM: dts: exynos: add prefetch properties for L2C-310 cache

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Message-Id: <30cb8edca2185241471ee1318b05288900652521.1597061474.git.guillaume.tucker@collabora.com>
Date:   Mon, 10 Aug 2020 13:22:07 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Russell King <linux@...linux.org.uk>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     kernel@...labora.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] ARM: dts: exynos: add prefetch properties for L2C-310 cache

Add the devicetree properties to enable instruction and data prefetch
on exynos4210 and exynos4412 which use the L2C-310 cache.  No other
Exynos chip appears to be using this L2 cache hardware.

This follows the default bits being set in the l2c_aux_val register
for the Exynos platform, which can now be cleared as a result.

Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
---

Notes:
    v2: split patch to include devicetree changes only

 arch/arm/boot/dts/exynos4210.dtsi | 2 ++
 arch/arm/boot/dts/exynos4412.dtsi | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4210.dtsi b/arch/arm/boot/dts/exynos4210.dtsi
index b4466232f0c1..7e0d253b26ef 100644
--- a/arch/arm/boot/dts/exynos4210.dtsi
+++ b/arch/arm/boot/dts/exynos4210.dtsi
@@ -102,6 +102,8 @@
 			reg = <0x10502000 0x1000>;
 			cache-unified;
 			cache-level = <2>;
+			prefetch-data = <1>;
+			prefetch-instr = <1>;
 			arm,tag-latency = <2 2 1>;
 			arm,data-latency = <2 2 1>;
 		};
diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi
index 48868947373e..37efa247bf4d 100644
--- a/arch/arm/boot/dts/exynos4412.dtsi
+++ b/arch/arm/boot/dts/exynos4412.dtsi
@@ -218,6 +218,8 @@
 			reg = <0x10502000 0x1000>;
 			cache-unified;
 			cache-level = <2>;
+			prefetch-data = <1>;
+			prefetch-instr = <1>;
 			arm,tag-latency = <2 2 1>;
 			arm,data-latency = <3 2 1>;
 			arm,double-linefill = <1>;
-- 
2.20.1