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

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Date:   Wed, 14 Dec 2022 09:09:06 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sibi Sankar <quic_sibis@...cinc.com>, 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

On 14/12/2022 07:49, Sibi Sankar wrote:
> 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.

AFAIR, Rob's bot ignores DTS patches anyway.

Best regards,
Krzysztof