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

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Message-ID: <5d6e7303-cc57-4a50-a9ad-b45d3c89d045@oss.qualcomm.com>
Date: Wed, 22 Oct 2025 19:09:38 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Neil Armstrong <neil.armstrong@...aro.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>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC RFT] drm/msm: adreno: attach the GMU device to a
 driver

On 10/22/25 2:44 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

Does this *actually* cause any harm, by the way?

For example on x1e, GMU refers to 2 GPU_CC GDSCs, GPU_CC refers
to a pair of GCC clocks and GCC refers to VDD_CX

and I see these prints, yet:

/sys/kernel/debug/pm_genpd/gpu_cx_gdsc/current_state:off-0
/sys/kernel/debug/pm_genpd/gpu_gx_gdsc/current_state:off-0

/sys/kernel/debug/pm_genpd/cx/current_state:on
/sys/kernel/debug/pm_genpd/cx/perf_state:256 # because of USB3 votes

I'm not super sure where that sync_state comes from either (maybe
dev_set_drv_sync_state in pmdomain/core?)

Konrad