linux-kernel - Re: [PATCH 1/4] arm64: dts: qcom: Introduce a carveout for modem metadata

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Message-ID: <96c1e60d-de12-5e60-4c06-70ea4b9c49f8@quicinc.com>
Date:   Wed, 14 Dec 2022 12:19:48 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <robh+dt@...nel.org>, <manivannan.sadhasivam@...aro.org>
CC:     <agross@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <konrad.dybcio@...ainline.org>, <amit.pundir@...aro.org>,
        <regressions@...mhuis.info>, <sumit.semwal@...aro.org>,
        <will@...nel.org>, <catalin.marinas@....com>,
        <robin.murphy@....com>
Subject: Re: [PATCH 1/4] arm64: dts: qcom: Introduce a carveout for modem
 metadata

Hey Krzysztof,

Thanks for taking time to review the series.

On 12/14/22 01:10, Krzysztof Kozlowski wrote:
> On 13/12/2022 15:07, Sibi Sankar wrote:
>> Introduce a new carveout for modem metadata. This will serve as a
>> replacement for the memory region used by MSA to authenticate modem
>> ELF headers.
>>
>> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
> 
> Thank you for your patch. There is something to discuss/improve.
> 
>>   
>>   	aliases {
>> @@ -865,7 +870,7 @@ hp_i2c: &i2c9 {
>>   	clock-names = "iface", "bus", "nav", "snoc_axi", "mnoc_axi", "xo";
>>   
>>   	iommus = <&apps_smmu 0x461 0x0>, <&apps_smmu 0x444 0x3>;
>> -	memory-region = <&mba_mem &mpss_mem>;
>> +	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
>>   
>>   	/* This gets overridden for SKUs with LTE support. */
>>   	firmware-name = "qcom/sc7180-trogdor/modem-nolte/mba.mbn",
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
>> index bf522a64b172..bda0495aa0b5 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
>> @@ -17,6 +17,11 @@
>>   			reg = <0x0 0x9c700000 0x0 0x200000>;
>>   			no-map;
>>   		};
>> +
>> +		mdata_mem: memory@...00000 {
>> +			reg = <0x0 0x9d100000 0x0 0x4000>;
>> +			no-map;
>> +		};
>>   	};
>>   };
>>   
>> @@ -32,7 +37,7 @@
>>   
>>   	iommus = <&apps_smmu 0x124 0x0>, <&apps_smmu 0x488 0x7>;
>>   	interconnects = <&mc_virt MASTER_LLCC 0 &mc_virt SLAVE_EBI1 0>;
>> -	memory-region = <&mba_mem>, <&mpss_mem>;
>> +	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
> 
> Only two memory regions are allowed by bindings... unless you fix it in
> further patchset. If so, please re-order to have the bindings first. It
> helps reviewers not to have such questions. :)

I felt that Rob's dt_bindings check bot might report an error
if the dt changes weren't placed before the bindings changes.
But since you asked for the logical order I guess the bindings
check are done only after the entire series is applied. I'll
change the order in the next re-spin.

- Sibi
> 
> 
> Best regards,
> Krzysztof
>