linux-kernel - Re: [PATCH RFC RFT] drm/msm: adreno: attach the GMU device to a driver

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Message-ID: <e879d3a1-45d9-46f0-adaf-6bea243ab807@linaro.org>
Date: Wed, 14 Jan 2026 09:45:06 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
 Konrad Dybcio <konradybcio@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Jessica Zhang <jessica.zhang@....qualcomm.com>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Subject: Re: [PATCH RFC RFT] drm/msm: adreno: attach the GMU device to a
 driver

Hi,

On 1/14/26 07:37, Akhil P Oommen wrote:
> On 10/22/2025 6:14 PM, Neil Armstrong wrote:
>> Due to the sync_state is enabled by default in pmdomain & CCF since v6.17,
>> the GCC and GPUCC sync_state would stay pending, leaving the resources in
>> full performance:
>> gcc-x1e80100 100000.clock-controller: sync_state() pending due to 3d6a000.gmu
>> gpucc-x1e80100 3d90000.clock-controller: sync_state() pending due to 3d6a000.gmu
>>
>> In order to fix this state and allow the GMU to be properly
>> probed, let's add a proper driver for the GMU and add it to
>> the MSM driver components.
>>
>> Only the proper GMU has been tested since I don't have
>> access to hardware with a GMU wrapper.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
>>   drivers/gpu/drm/msm/adreno/a6xx_gmu.c      | 354 ++++++++++++++---------------
>>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c      |   6 -
>>   drivers/gpu/drm/msm/adreno/a6xx_gpu.h      |   3 -
>>   drivers/gpu/drm/msm/adreno/adreno_device.c |   4 +
>>   drivers/gpu/drm/msm/adreno/adreno_gpu.h    |   4 +
>>   drivers/gpu/drm/msm/msm_drv.c              |  16 +-
>>   6 files changed, 192 insertions(+), 195 deletions(-)
>>
> 
> Niel,
> 
> Could you please send the follow up revision of this patch? Lets get
> this fix merged.

I'm really struggling on the separate_gpu_kms part, it's not trivial at all.

I'll try again and report my current status.

Neil

> 
> -Akhil.
>