linux-kernel - Re: [PATCH 0/4] Start using rpmpd for power domains on MSM8974

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Message-ID: <841c41cc-e44d-40c7-9431-a77feaa49b05@lucaweiss.eu>
Date: Tue, 24 Jun 2025 20:46:28 +0200
From: Luca Weiss <luca@...aweiss.eu>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: ~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>, linux-arm-msm@...r.kernel.org,
 linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] Start using rpmpd for power domains on MSM8974

Hi Dmitry,

On 24-06-2025 2:59 a.m., Dmitry Baryshkov wrote:
> On Sat, Jun 21, 2025 at 03:19:55PM +0200, Luca Weiss wrote:
>> Switch over the ADSP PIL to use power-domains instead of a regulator,
>> and have one commit switching over the MSM8974 SoC plus all the devices
>> to use power-domains.
>>
>> Note, that I'm aware that these changes are not backwards compatible and
>> not really bisectable, but since it only affects the ADSP on these
> 
> Why? The cx-supply is handled unconditionally. A single-domain usecase
> is also handled via a special code path. I think this might be
> backwards-compatible, by the pure luck.

Honestly I have not tried and not looked much. I mostly added this 
paragraph to avoid the response that this change might break and is not 
really backwards compatible. If it does (by accident) work with the 
updated dts without the driver and the other way around, then even better.

Regards
Luca

> 
>> pretty old boards, I say it's fine to have this. Get all the patches
>> into the same release (6.17?) and then we're good again.
>>
>> Signed-off-by: Luca Weiss <luca@...aweiss.eu>
>> ---
>> Luca Weiss (4):
>>        dt-bindings: remoteproc: qcom,adsp: Make msm8974 use CX as power domain
>>        remoteproc: qcom_q6v5_pas: Use resource with CX PD for MSM8974
>>        ARM: dts: qcom: msm8974: Sort header includes alphabetically
>>        ARM: dts: qcom: msm8974: Start using rpmpd for power domains
>>
>>   .../devicetree/bindings/remoteproc/qcom,adsp.yaml  | 18 ++------
>>   .../arm/boot/dts/qcom/qcom-apq8074-dragonboard.dts | 13 ------
>>   .../qcom/qcom-msm8974-lge-nexus5-hammerhead.dts    | 12 ------
>>   .../boot/dts/qcom/qcom-msm8974-samsung-hlte.dts    | 12 ------
>>   .../dts/qcom/qcom-msm8974-sony-xperia-rhine.dtsi   | 12 ------
>>   arch/arm/boot/dts/qcom/qcom-msm8974.dtsi           | 50 ++++++++++++++++++++--
>>   .../dts/qcom/qcom-msm8974pro-fairphone-fp2.dts     |  8 ----
>>   arch/arm/boot/dts/qcom/qcom-msm8974pro-htc-m8.dts  | 11 -----
>>   .../dts/qcom/qcom-msm8974pro-oneplus-bacon.dts     |  9 ----
>>   .../qcom/qcom-msm8974pro-samsung-klte-common.dtsi  | 11 ++---
>>   ...qcom-msm8974pro-sony-xperia-shinano-common.dtsi | 12 ------
>>   drivers/remoteproc/qcom_q6v5_pas.c                 |  2 +-
>>   12 files changed, 56 insertions(+), 114 deletions(-)
>> ---
>> base-commit: 7fa2fb97cd28e1d9670da538095565b6fba83977
>> change-id: 20250621-msm8974-rpmpd-switch-b19b166c02be
>>
>> Best regards,
>> -- 
>> Luca Weiss <luca@...aweiss.eu>
>>
>