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

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Message-ID: <cdf8428f-1407-4482-b946-804ffcdae3c7@oss.qualcomm.com>
Date: Tue, 24 Jun 2025 15:25:33 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca@...aweiss.eu>, ~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 6/23/25 6:44 PM, Luca Weiss wrote:
> 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.

sm6115

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

*oh*... right

You would then have to somehow selectively bind the OXILI_GDSC to
VDD_GX, for which I don't know if we have a good interface today..

Konrad