linux-kernel - Re: [PATCH v5 3/5] arm64: dts: qcom: Add initial support for MSM8937

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Message-ID: <c7d9f42017f10bac303b483127859c18@mainlining.org>
Date: Fri, 02 May 2025 21:04:44 +0200
From: barnabas.czeman@...nlining.org
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Michael Turquette
 <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
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 <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy
 <robin.murphy@....com>, Konrad Dybcio <konradybcio@...nel.org>, Rob Clark
 <robdclark@...il.com>, Sean Paul <sean@...rly.run>, Abhinav Kumar
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 <srini@...nel.org>, linux-arm-msm@...r.kernel.org,
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 ~postmarketos/upstreaming@...ts.sr.ht, linux@...nlining.org, Dang Huynh
 <danct12@...eup.net>
Subject: Re: [PATCH v5 3/5] arm64: dts: qcom: Add initial support for MSM8937

On 2025-04-25 23:02, Konrad Dybcio wrote:
> On 4/25/25 10:22 PM, barnabas.czeman@...nlining.org wrote:
>> On 2025-04-25 21:26, Konrad Dybcio wrote:
>>> On 4/25/25 5:13 PM, barnabas.czeman@...nlining.org wrote:
>>>> On 2025-04-25 11:57, Konrad Dybcio wrote:
>>>>> On 4/23/25 4:46 PM, barnabas.czeman@...nlining.org wrote:
>>>>>> On 2025-04-23 16:03, Konrad Dybcio wrote:
>>>>>>> On 4/21/25 10:18 PM, Barnabás Czémán wrote:
>>>>>>>> From: Dang Huynh <danct12@...eup.net>
>>>>>>>> 
>>>>>>>> Add initial support for MSM8937 SoC.
>>>>>>>> 
>>>>>>>> Signed-off-by: Dang Huynh <danct12@...eup.net>
>>>>>>>> Co-developed-by: Barnabás Czémán 
>>>>>>>> <barnabas.czeman@...nlining.org>
>>>>>>>> Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
>>>>>>>> ---
>>>>> 
>>>>> [...]
>>>>> 
>>>>>>>> +            gpu_opp_table: opp-table {
>>>>>>>> +                compatible = "operating-points-v2";
>>>>>>>> +
>>>>>>>> +                opp-19200000 {
>>>>>>>> +                    opp-hz = /bits/ 64 <19200000>;
>>>>>>>> +                    opp-supported-hw = <0xff>;
>>>>>>> 
>>>>>>> The comment from the previous revision still stands
>>>>>> If i remove opp-supported-hw i will got -22 EINVAL messages and 
>>>>>> the opp will be not fine.
>>>>> 
>>>>> Right, I have a series pending to improve this situation a bit..
>>>>> 
>>>>> In the meantime, you should be able to define the nvmem cell and
>>>>> fill in meaningful values for this platform
>>>> As I wrote in the previous revision there is no nvmem for GPU on 
>>>> msm8937 only on msm8940.
>>> 
>>> This seems not to be the case
>>> 
>>> https://github.com/penglezos/android_kernel_xiaomi_msm8953/blob/pie/arch/arm/boot/dts/qcom/msm8937.dtsi#L2046-L2191
>>> 
>> These are on msm-4.9 was moved to msm8940.dtsi
>> https://git.codelinaro.org/clo/la/kernel/msm-4.9/-/blob/LA.UM.10.6.2.c26-01500-89xx.0/arch/arm64/boot/dts/qcom/msm8937-gpu.dtsi#L162
>> https://git.codelinaro.org/clo/la/kernel/msm-4.9/-/blob/LA.UM.10.6.2.c26-01500-89xx.0/arch/arm64/boot/dts/qcom/msm8940.dtsi#L600
>> 475 MHz and 500 MHz is for msm8940 at least based on 4.9
> 
> I'll try to get a more conclusive answer internally
Any information? I am thinking about define nvmem cells based on 3.18
> 
> Konrad