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Subject[PATCH 3/3] ARM: exynos: use DT prefetch attributes rather than l2c_aux_val
Date
Use the standard l2c2x0 device tree bindings to enable data and
instruction prefetch on exynos4210 and exynos4412 and clear the
respective bits in the default l2c_aux_val. No other Exynos platform
relying on this default register value appears to be using the l2x0
cache.

Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>
---
arch/arm/boot/dts/exynos4210.dtsi | 2 ++
arch/arm/boot/dts/exynos4412.dtsi | 2 ++
arch/arm/mach-exynos/exynos.c | 4 ++--
3 files changed, 6 insertions(+), 2 deletions(-)

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>;
diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index a96f3353a0c1..0e906cc3a48e 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -193,8 +193,8 @@ static void __init exynos_dt_fixup(void)
}

DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)")
- .l2c_aux_val = 0x38400000,
- .l2c_aux_mask = 0xc60fffff,
+ .l2c_aux_val = 0x08400000,
+ .l2c_aux_mask = 0xf60fffff,
.smp = smp_ops(exynos_smp_ops),
.map_io = exynos_init_io,
.init_early = exynos_firmware_init,
--
2.20.1
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