linux-kernel - Re: [PATCHv1 3/5] arm64: dts: amlogic: Add cache information to the Amlogic G12A SoCS

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Date: Tue, 6 Feb 2024 10:48:09 +0300
From: Viacheslav <adeep@...ina.in>
To: Anand Moon <linux.amoon@...il.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv1 3/5] arm64: dts: amlogic: Add cache information to the
 Amlogic G12A SoCS

Hi!

You missed the AXG family with the Cortex-A53 CPU. The datasheet does 
not provide information on cache sizes. Given that the A113X/A113D are 
equipped with the Arm Cortex-A53 processor, it is assumed they use the 
same cache size as the S905/S905X/S905X2 models.

05/02/2024 20.19, Anand Moon wrote:
> As per the S905X2 datasheet add missing cache information to the Amlogic
> G12A SoC.
> 
> - Each Cortex-A53 core has 32KB of L1 instruction cache available and
> 	32KB of L1 data cache available.
> - Along with 512KB Unified L2 cache.
> 
> To improve system performance.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> No public dataheet available, since S905X2 support Arm Cortex-A53 cpu
> nence used the same cache size as S905 and S905X.
> ---
>   arch/arm64/boot/dts/amlogic/meson-g12a.dtsi | 27 +++++++++++++++++++++
>   1 file changed, 27 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
> index 543e70669df5..6e1e3a3f5f18 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
> @@ -17,6 +17,12 @@ cpu0: cpu@0 {
>   			compatible = "arm,cortex-a53";
>   			reg = <0x0 0x0>;
>   			enable-method = "psci";
> +			d-cache-line-size = <32>;
> +			d-cache-size = <0x8000>;
> +			d-cache-sets = <32>;
> +			i-cache-line-size = <32>;
> +			i-cache-size = <0x8000>;
> +			i-cache-sets = <32>;
>   			next-level-cache = <&l2>;
>   			#cooling-cells = <2>;
>   		};
> @@ -26,6 +32,12 @@ cpu1: cpu@1 {
>   			compatible = "arm,cortex-a53";
>   			reg = <0x0 0x1>;
>   			enable-method = "psci";
> +			d-cache-line-size = <32>;
> +			d-cache-size = <0x8000>;
> +			d-cache-sets = <32>;
> +			i-cache-line-size = <32>;
> +			i-cache-size = <0x8000>;
> +			i-cache-sets = <32>;
>   			next-level-cache = <&l2>;
>   			#cooling-cells = <2>;
>   		};
> @@ -35,6 +47,12 @@ cpu2: cpu@2 {
>   			compatible = "arm,cortex-a53";
>   			reg = <0x0 0x2>;
>   			enable-method = "psci";
> +			d-cache-line-size = <32>;
> +			d-cache-size = <0x8000>;
> +			d-cache-sets = <32>;
> +			i-cache-line-size = <32>;
> +			i-cache-size = <0x8000>;
> +			i-cache-sets = <32>;
>   			next-level-cache = <&l2>;
>   			#cooling-cells = <2>;
>   		};
> @@ -44,6 +62,12 @@ cpu3: cpu@3 {
>   			compatible = "arm,cortex-a53";
>   			reg = <0x0 0x3>;
>   			enable-method = "psci";
> +			d-cache-line-size = <32>;
> +			d-cache-size = <0x8000>;
> +			d-cache-sets = <32>;
> +			i-cache-line-size = <32>;
> +			i-cache-size = <0x8000>;
> +			i-cache-sets = <32>;
>   			next-level-cache = <&l2>;
>   			#cooling-cells = <2>;
>   		};
> @@ -52,6 +76,9 @@ l2: l2-cache0 {
>   			compatible = "cache";
>   			cache-level = <2>;
>   			cache-unified;
> +			cache-size = <0x7d000>; /* L2. 512 KB */
> +			cache-line-size = <64>;
> +			cache-sets = <512>;
>   		};
>   	};
>   


Best regards,
--
Viacheslav Bocharov <adeep@...ina.in>