linux-kernel - Re: [PATCH v3] arm64: dts: qcom: sdm630: Add support for modem remoteproc

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Message-ID: <a23e7b67-877f-5fc4-754a-4fa1b54b9a1c@postmarketos.org>
Date:   Wed, 19 Jul 2023 15:58:43 +0300
From:   Alexey Minnekhanov <alexeymin@...tmarketos.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Sibi Sankar <quic_sibis@...cinc.com>
Subject: Re: [PATCH v3] arm64: dts: qcom: sdm630: Add support for modem
 remoteproc

On 19.07.2023 13:18, Krzysztof Kozlowski wrote:>>           From schema:
>> .../Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
>>     .../arch/arm64/boot/dts/qcom/sdm660-xiaomi-lavender.dtb:
>> remoteproc@...0000: memory-region: [[45], [46]] is too short
>>           From schema:
>> .../Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
> 
> This needs fixes. The binding lists expected memory regions and you do
> not have three of them.
> 
> Best regards,
> Krzysztof
> 

According to driver code, dedicated reserved metadata memory region is 
optional. If it is not provided, it is allocated by driver itself using 
dma_alloc_attr() and then passed to modem processor.

I see that MSM8996 and MSM8998 (nearest sdm660 siblings) got their 
dedicated metadata reserved regions in patchset [1]. SDM660 MSS was not 
present at that time and I'm not sure if it is needed for this SoC, 
because downstream device tree for my device does not have this region. 
I can either do similar trick for sdm630.dtsi, or alternatively maybe we 
should fix bindings to indicate that metadata region is optional?

I did quick test: added dedicated reserved metadata region, and 
everything still works fine, it seems, and one DTB check warning was gone.

[1] 
https://lore.kernel.org/all/20230117085840.32356-1-quic_sibis@quicinc.com/

-- 
Regards,
Alexey Minnekhanov
postmarketOS developer