linux-kernel - Re: [PATCH v6 0/8] Support for Adreno 612 GPU

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Message-ID: <d3274681-c437-4ec1-918e-10e49cbcc676@oss.qualcomm.com>
Date: Fri, 16 Jan 2026 13:43:21 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: rob.clark@....qualcomm.com
Cc: Sean Paul <sean@...rly.run>, Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Jessica Zhang <jesszhan0024@...il.com>,
        Gaurav Kohli <gaurav.kohli@....qualcomm.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jie Zhang <jie.zhang@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Qingqing Zhou <quic_qqzhou@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Jie Zhang <quic_jiezh@...cinc.com>
Subject: Re: [PATCH v6 0/8] Support for Adreno 612 GPU - Respin

On 1/16/2026 3:52 AM, Rob Clark wrote:
> On Wed, Dec 31, 2025 at 12:45 AM Akhil P Oommen
> <akhilpo@....qualcomm.com> wrote:
>>
>> This is a respin of an old series [1] that aimed to add support for
>> Adreno 612 GPU found in SM6150/QCS615 chipsets. In this version, we
>> have consolidated the previously separate series for DT and driver
>> support, along with some significant rework.
>>
>> Regarding A612 GPU, it falls under ADRENO_6XX_GEN1 family and is a cut
>> down version of A615 GPU. A612 has a new IP called Reduced Graphics
>> Management Unit or RGMU, a small state machine which helps to toggle
>> GX GDSC (connected to CX rail) to implement the IFPC feature. Unlike a
>> full-fledged GMU, the RGMU does not support features such as clock
>> control, resource voting via RPMh, HFI etc. Therefore, we require linux
>> clock driver support similar to gmu-wrapper implementations to control
>> gpu core clock and GX GDSC.
>>
>> In this series, the description of RGMU hardware in devicetree is more
>> complete than in previous version. However, the RGMU core is not
>> initialized from the driver as there is currently no need for it. We do
>> perform a dummy load of RGMU firmware (now available in linux-firmware)
>> to ensure that enabling RGMU core in the future won't break backward
>> compatibility for users.
>>
>> Due to significant changes compared to the old series, all R-b tags have
>> been dropped. Please review with fresh eyes.
>>
>> Last 3 patches are for Bjorn and the rest are for Rob Clark for pick up.
> 
> I guess you meant the last 4 patches are for Bjorn?

Yes, that is correct. I missed updating this sentence after including
the GPU cooling related dt patch.

-Akhil

> 
> BR,
> -R
> 
>>
>> [1] Driver: https://lore.kernel.org/lkml/20241213-a612-gpu-support-v3-1-0e9b25570a69@quicinc.com/
>>     Devicetree: https://lore.kernel.org/lkml/fu4rayftf3i4arf6l6bzqyzsctomglhpiniljkeuj74ftvzlpo@vklca2giwjlw/
>>
>> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
>> ---
>> Changes in v6:
>> - Move the rgmu register range update from patch#8 to patch#6.
>> - Capture trailers
>> - Link to v5: https://lore.kernel.org/r/20251226-qcs615-spin-2-v5-0-354d86460ccb@oss.qualcomm.com
>>
>> Changes in v5:
>> - Rebase on v6.19-rc2
>> - Make the reg list in A612 GPU's binding doc stricter (Krzysztof)
>> - Link to v4: https://lore.kernel.org/r/20251204-qcs615-spin-2-v4-0-f5a00c5b663f@oss.qualcomm.com
>>
>> Changes in v4:
>> - Rebased on top of next-20251204 tag
>> - Added a new patch to simplify gpu dt schema (Krzysztof)
>> - Added a new patch for GPU cooling support (Gaurav)
>> - Updated the gpu/gmu register range in DT to be more accurate
>> - Remove 290Mhz corner for GPU as that is not present in downstream
>> - Link to v3: https://lore.kernel.org/r/20251122-qcs615-spin-2-v3-0-9f4d4c87f51d@oss.qualcomm.com
>>
>> Changes in v3:
>> - Rebased on top of next-20251121 tag
>> - Drop a612 driver support patch as it got picked up
>> - Rename rgmu.yaml -> qcom,adreno-rgmu.yaml (Krzysztof)
>> - Remove reg-names property for rgmu node (Krzysztof)
>> - Use 'gmu' instead of 'rgmu' as node name (Krzysztof)
>> - Describe cx_mem and cx_dgc register ranges (Krzysztof)
>> - A new patch to retrieve gmu core reg resource by id
>> - Link to v2: https://lore.kernel.org/r/20251107-qcs615-spin-2-v2-0-a2d7c4fbf6e6@oss.qualcomm.com
>>
>> Changes in v2:
>> - Rebased on next-20251105
>> - Fix hwcg configuration (Dan)
>> - Reuse a few gmu-wrapper routines (Konrad)
>> - Split out rgmu dt schema (Krzysztof/Dmitry)
>> - Fixes for GPU dt binding doc (Krzysztof)
>> - Removed VDD_CX from rgmu dt node. Will post a separate series to
>> address the gpucc changes (Konrad)
>> - Fix the reg range size for adreno smmu node and reorder the properties (Konrad)
>> - Link to v1: https://lore.kernel.org/r/20251017-qcs615-spin-2-v1-0-0baa44f80905@oss.qualcomm.com
>>
>> ---
>> Akhil P Oommen (3):
>>       drm/msm/a6xx: Retrieve gmu core range by index
>>       dt-bindings: display/msm: gpu: Simplify conditional schema logic
>>       dt-bindings: display/msm: gpu: Document A612 GPU
>>
>> Gaurav Kohli (1):
>>       arm64: dts: qcom: talos: Add GPU cooling
>>
>> Jie Zhang (3):
>>       dt-bindings: display/msm/rgmu: Document A612 RGMU
>>       arm64: dts: qcom: talos: Add gpu and rgmu nodes
>>       arm64: dts: qcom: qcs615-ride: Enable Adreno 612 GPU
>>
>> Qingqing Zhou (1):
>>       arm64: dts: qcom: talos: add the GPU SMMU node
>>
>>  .../devicetree/bindings/display/msm/gpu.yaml       |  89 +++++++++---
>>  .../bindings/display/msm/qcom,adreno-rgmu.yaml     | 126 +++++++++++++++++
>>  MAINTAINERS                                        |   1 +
>>  arch/arm64/boot/dts/qcom/qcs615-ride.dts           |   8 ++
>>  arch/arm64/boot/dts/qcom/talos.dtsi                | 149 +++++++++++++++++++++
>>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c              |  14 +-
>>  6 files changed, 357 insertions(+), 30 deletions(-)
>> ---
>> base-commit: 2408853dde584f01950a0f976b743739cce30eca
>> change-id: 20251015-qcs615-spin-2-ed45b0deb998
>>
>> Best regards,
>> --
>> Akhil P Oommen <akhilpo@....qualcomm.com>
>>