linux-kernel - Re: [PATCH v4 1/3] arm64: dts: qcom: sc7280: Add proxy interconnect requirements for modem

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Message-ID: <031ebead-4b0d-8493-d8f8-96f2ff9d938a@quicinc.com>
Date:   Fri, 20 May 2022 23:38:52 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <ohad@...ery.com>, <agross@...nel.org>,
        <mathieu.poirier@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <swboyd@...omium.org>,
        <mka@...omium.org>
Subject: Re: [PATCH v4 1/3] arm64: dts: qcom: sc7280: Add proxy interconnect
 requirements for modem

Hey Bjorn,
Thanks for taking time to review the series.

On 5/20/22 2:05 AM, Bjorn Andersson wrote:
> On Thu 19 May 09:47 PDT 2022, Sibi Sankar wrote:
> 
>> Add interconnects that are required to be proxy voted upon during modem
>> bootup on SC7280 SoCs.
> 
> This looks reasonable, but how come the vote is only for DDR frequency?
> What about the buses between modem and ddr?

The proxy votes that are put in aren't for perf related reasons, the
modem was getting llcc timeouts while trying to read contents from 
memory. The hw team recommended the proxy votes as the fix.

-Sibi

> 
> Regards,
> Bjorn
> 
>>
>> Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
>> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
>> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi b/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
>> index 9f4a9c263c35..91aad86cc708 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
>> @@ -88,6 +88,7 @@
>>   	status = "okay";
>>   	compatible = "qcom,sc7280-mss-pil";
>>   	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>;
>>   };
>>   
>> -- 
>> 2.7.4
>>