linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j7200: Fix the L2 cache sets

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Message-ID: <20211203110734.23e2t356s45ux5mu@ti.com>
Date:   Fri, 3 Dec 2021 16:37:34 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Nishanth Menon <nm@...com>
CC:     Rob Herring <robh+dt@...nel.org>, Tero Kristo <kristo@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] arm64: dts: ti: k3-j7200: Fix the L2 cache sets

On 12/11/21 10:36PM, Nishanth Menon wrote:
> A72's L2 cache[1] on J7200[2] is 1MB. A53's L2 is fixed line length of
                                        ^^^

Same as previous patch, do you mean A72? J7200 does not have an A53 core 
and this cache node is for A72 cores anyway.

With this fixed,

Reviewed-by: Pratyush Yadav <p.yadav@...com>

> 64 bytes and 16-way set-associative cache structure.
> 
> 1MB of L2 / 64 (line length) = 16384 ways
> 16384 ways / 16 = 1024 sets
> 
> Fix the l2 cache-sets.
> 
> [1] https://developer.arm.com/documentation/100095/0003/Level-2-Memory-System/About-the-L2-memory-system
> [2] https://www.ti.com/lit/pdf/spruiu1
> 
> Fixes: d361ed88455f ("arm64: dts: ti: Add support for J7200 SoC")
> Reported-by: Peng Fan <peng.fan@....com>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-j7200.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200.dtsi b/arch/arm64/boot/dts/ti/k3-j7200.dtsi
> index 958587d3a33d..64fef4e67d76 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j7200.dtsi
> @@ -86,7 +86,7 @@ L2_0: l2-cache0 {
>  		cache-level = <2>;
>  		cache-size = <0x100000>;
>  		cache-line-size = <64>;
> -		cache-sets = <2048>;
> +		cache-sets = <1024>;
>  		next-level-cache = <&msmc_l3>;
>  	};
>  

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.