linux-kernel - [RFC PATCH 00/24] GPU_CC power requirements reality check

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Message-Id: <20250728-topic-gpucc_power_plumbing-v1-0-09c2480fe3e6@oss.qualcomm.com>
Date: Mon, 28 Jul 2025 18:16:00 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 Johan Hovold <johan+linaro@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Taniya Das <taniya.das@....qualcomm.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>, 
 Imran Shaik <quic_imrashai@...cinc.com>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Dmitry Baryshkov <lumag@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
 Douglas Anderson <dianders@...omium.org>, Vinod Koul <vkoul@...nel.org>, 
 Richard Acayan <mailingradian@...il.com>, 
 Andy Gross <andy.gross@...aro.org>, Ajit Pandey <quic_ajipan@...cinc.com>, 
 Luca Weiss <luca.weiss@...rphone.com>, Jonathan Marek <jonathan@...ek.ca>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jagadeesh Kona <quic_jkona@...cinc.com>, 
 Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, 
 devicetree@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [RFC PATCH 00/24] GPU_CC power requirements reality check

In an effort parallel to [1], the GPU clock controller requires more
than 0/1 power domains to function properly.
Describe these dependencies to ensure the hardware can always power on
safely.

Patches 1 & 2 are separate (but related) fixes,  which need to be
merged before the DT change for SC8280XP.

Posting as RFC since I only got to test it on SC8280XP(-crd).

[1] https://lore.kernel.org/all/20250530-videocc-pll-multi-pd-voting-v5-0-02303b3a582d@quicinc.com/

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
Konrad Dybcio (24):
      dt-bindings: power: qcom,rpmpd: Add SC8280XP_MXC_AO
      pmdomain: qcom: rpmhpd: Add MXC to SC8280XP
      dt-bindings: clock: qcom,gpucc: Merge in sm8450-gpucc.yaml
      dt-bindings: clock: qcom,gpucc: Describe actual power domain plumbing
      dt-bindings: clock: qcom,gpucc: Sort out SA8540P constraints
      arm64: dts: qcom: qcs8300: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sa8540p: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sa8775p: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sar2130p: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sc7180: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sc7280: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sc8180x: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sc8280xp: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sdm670: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sdm845: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm4450: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm6350: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm8150: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm8250: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm8350: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm8450: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm8550: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: sm8650: Describe GPU_CC power plumbing requirements
      arm64: dts: qcom: x1e80100: Describe GPU_CC power plumbing requirements

 .../devicetree/bindings/clock/qcom,gpucc.yaml      | 155 ++++++++++++++++++---
 .../bindings/clock/qcom,sm8450-gpucc.yaml          |  75 ----------
 arch/arm64/boot/dts/qcom/qcs8300.dtsi              |   6 +
 arch/arm64/boot/dts/qcom/sa8155p.dtsi              |   6 +
 arch/arm64/boot/dts/qcom/sa8540p.dtsi              |   6 +-
 arch/arm64/boot/dts/qcom/sa8775p.dtsi              |   5 +
 arch/arm64/boot/dts/qcom/sar2130p.dtsi             |   5 +
 arch/arm64/boot/dts/qcom/sc7180.dtsi               |   5 +
 arch/arm64/boot/dts/qcom/sc7280.dtsi               |   5 +
 arch/arm64/boot/dts/qcom/sc8180x.dtsi              |   5 +
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi             |   6 +-
 arch/arm64/boot/dts/qcom/sdm670.dtsi               |   4 +
 arch/arm64/boot/dts/qcom/sdm845.dtsi               |   4 +
 arch/arm64/boot/dts/qcom/sm4450.dtsi               |   4 +
 arch/arm64/boot/dts/qcom/sm6350.dtsi               |   4 +
 arch/arm64/boot/dts/qcom/sm8150.dtsi               |   4 +
 arch/arm64/boot/dts/qcom/sm8250.dtsi               |   5 +
 arch/arm64/boot/dts/qcom/sm8350.dtsi               |   6 +
 arch/arm64/boot/dts/qcom/sm8450.dtsi               |   6 +
 arch/arm64/boot/dts/qcom/sm8550.dtsi               |   6 +
 arch/arm64/boot/dts/qcom/sm8650.dtsi               |   5 +
 arch/arm64/boot/dts/qcom/x1e80100.dtsi             |   6 +
 drivers/pmdomain/qcom/rpmhpd.c                     |   4 +
 include/dt-bindings/power/qcom-rpmpd.h             |   1 +
 24 files changed, 240 insertions(+), 98 deletions(-)
---
base-commit: 0b90c3b6d76ea512dc3dac8fb30215e175b0019a
change-id: 20250728-topic-gpucc_power_plumbing-646275aec2cb

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@....qualcomm.com>