linux-kernel - Re: [PATCH 3/4] arm64: dts: qcom: msm8996: Improve GPU OPP table

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Date:   Thu, 30 Mar 2023 12:57:18 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Vinod Koul <vkoul@...nel.org>, Rob Clark <robdclark@...il.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Gross <andy.gross@...aro.org>
Subject: Re: [PATCH 3/4] arm64: dts: qcom: msm8996: Improve GPU OPP table



On 29.03.2023 23:32, Dmitry Baryshkov wrote:
> On Wed, 29 Mar 2023 at 22:17, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>> Remove the self-explanatory comment about opp-supported-hw contents,
>> add required-opps to ensure reasonable power domain levels are voted
>> for (currently we've been piggybacking off of miracles and MDP votes)
>> and add newlines between each subnode.
> 
> I'm not sure this is 100% correct. The values that you add are correct
> for the voltage scaling case. However, based on the vendor kernel
> sources I think that MX should only be scaled if the voltage is scaled
> too. I might be wrong here.
MX must be >= CX (and GX), so this should bring no harm.

(citation needed, but that seems to hold true..)

Konrad
> 
>>
>> Fixes: 69cc3114ab0f ("arm64: dts: Add Adreno GPU definitions")
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  arch/arm64/boot/dts/qcom/msm8996.dtsi | 18 +++++++++++++-----
>>  1 file changed, 13 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
>> index 4dd37f72e018..62ad30e94f40 100644
>> --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
>> @@ -1244,37 +1244,45 @@ gpu: gpu@...000 {
>>                         gpu_opp_table: opp-table {
>>                                 compatible = "operating-points-v2";
>>
>> -                               /*
>> -                                * 624Mhz is only available on speed bins 0 and 3.
>> -                                * 560Mhz is only available on speed bins 0, 2 and 3.
>> -                                * All the rest are available on all bins of the hardware.
>> -                                */
>>                                 opp-624000000 {
>>                                         opp-hz = /bits/ 64 <624000000>;
>> +                                       required-opps = <&rpmpd_opp_turbo>;
>>                                         opp-supported-hw = <0x09>;
>>                                 };
>> +
>>                                 opp-560000000 {
>>                                         opp-hz = /bits/ 64 <560000000>;
>> +                                       required-opps = <&rpmpd_opp_turbo>;
>>                                         opp-supported-hw = <0x0d>;
>>                                 };
>> +
>>                                 opp-510000000 {
>>                                         opp-hz = /bits/ 64 <510000000>;
>> +                                       required-opps = <&rpmpd_opp_nom>;
>>                                         opp-supported-hw = <0xff>;
>>                                 };
>> +
>>                                 opp-401800000 {
>>                                         opp-hz = /bits/ 64 <401800000>;
>> +                                       required-opps = <&rpmpd_opp_nom>;
>>                                         opp-supported-hw = <0xff>;
>>                                 };
>> +
>>                                 opp-315000000 {
>>                                         opp-hz = /bits/ 64 <315000000>;
>> +                                       required-opps = <&rpmpd_opp_svs>;
>>                                         opp-supported-hw = <0xff>;
>>                                 };
>> +
>>                                 opp-214000000 {
>>                                         opp-hz = /bits/ 64 <214000000>;
>> +                                       required-opps = <&rpmpd_opp_svs>;
>>                                         opp-supported-hw = <0xff>;
>>                                 };
>> +
>>                                 opp-133000000 {
>>                                         opp-hz = /bits/ 64 <133000000>;
>> +                                       required-opps = <&rpmpd_opp_svs>;
>>                                         opp-supported-hw = <0xff>;
>>                                 };
>>                         };
>>
>> --
>> 2.40.0
>>
> 
>