linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j721s2-main: fix msmc node

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Message-ID: <36fc3872-96ba-e503-cfff-754036e561e1@ti.com>
Date:   Thu, 13 Apr 2023 10:45:36 +0530
From:   Udit Kumar <u-kumar1@...com>
To:     Nishanth Menon <nm@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <a-govindraju@...com>,
        <kishon@...com>, <n-dasan@...com>
Subject: Re: [PATCH] arm64: dts: ti: k3-j721s2-main: fix msmc node

Hi Nishanth,

On 13/04/23 01:26, Nishanth Menon wrote:
> On 23:06-20230412, Udit Kumar wrote:
>> On J721S2 SOC, l3cache-sram size is configured as zero by
>> system firmware.
>> Also top 64K of msmc_ram (0x703F_0000 to 0x703F_FFFF) is used by system
>> firmware tifs-sram.
>>
>> This patch removes l3cache-sram node and update range for tifs-sram.
>>
>> Fixes: b8545f9d3a54 ("arm64: dts: ti: Add initial support for J721S2 SoC")
>>
>> Signed-off-by: Udit Kumar <u-kumar1@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 7 ++-----
>>   1 file changed, 2 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
>> index 2dd7865f7654..cbc784f915a9 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
>> @@ -17,13 +17,10 @@ atf-sram@0 {
>>   			reg = <0x0 0x20000>;
>>   		};
>>   
>> -		tifs-sram@...000 {
>> -			reg = <0x1f0000 0x10000>;
>> +		tifs-sram@...000 {
>> +			reg = <0x3f0000 0x10000>;
>>   		};
>>   
>> -		l3cache-sram@...000 {
>> -			reg = <0x200000 0x200000>;
>> -		};
>>   	};
>>   
>>   	gic500: interrupt-controller@...0000 {
>> -- 
>> 2.34.1
>>
> Are you saying that j721s2 is incapable of l3 cache? say some level 1
> errata?
No
> or is it because, the chip is really capable of l3 cache and we are
> really setting it to 0?
>
> https://git.ti.com/cgit/k3-image-gen/k3-image-gen/tree/soc/j721s2/evm/board-cfg.c#n71
This is because, l3 cache size is set to zero.
> unless the chip has an errata, you are supposed to fix it up based on
> configuration by using the API and this patch is a NAK
> https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/general/core.html#tisci-query-msmc
ok