linux-kernel - Re: [PATCH 4/4] ARM: dts: qcom: msm8974: Start using rpmpd for power domains

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Message-ID: <d31bf707-0f8c-4f55-927a-a08c5310b7be@lucaweiss.eu>
Date: Mon, 23 Jun 2025 18:44:25 +0200
From: Luca Weiss <luca@...aweiss.eu>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Manivannan Sadhasivam <mani@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] ARM: dts: qcom: msm8974: Start using rpmpd for power
 domains

On 23-06-2025 2:39 p.m., Konrad Dybcio wrote:
> On 6/21/25 3:19 PM, Luca Weiss wrote:
>> Due to historical reasons all msm8974 boards have used the CX power rail
>> as regulator instead of going through the power domain framework.
>>
>> Since rpmpd has gained msm8974 support quite a bit ago, let's start
>> using it and replace all usages of pm8841_s2 (CX), pm8841_s4 (GFX) and
>> for the boards using pma8084 pma8084_s2 (CX), pma8084_s7 (GFX).
>>
>> For reference, downstream is using GFX power rail as parent-supply for
>> mmcc's OXILI_GDSC GDSC which then is used for GPU, but nothing there is
>> modelled upstream.
> 
> if you use an opp table with described rpmpd levels and bind the GFX
> domain to gpucc, it should propagate - check it out

I don't *really* understand what you mean here. I'd be happy if you 
provided an example (or better yet, a patch) for this.

Also msm8974 does not have gpucc, only gcc and mmcc.

> 
>>
>> Signed-off-by: Luca Weiss <luca@...aweiss.eu>
>> ---
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Thanks!

Regards
Luca

> 
> Konrad