From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: fabricioakio@gmail.com, Rob Clark <robin.clark@oss.qualcomm.com>,
Sean Paul <sean@poorly.run>,
Konrad Dybcio <konradybcio@kernel.org>,
Akhil P Oommen <akhilpo@oss.qualcomm.com>,
Dmitry Baryshkov <lumag@kernel.org>,
Abhinav Kumar <abhinav.kumar@linux.dev>,
Jessica Zhang <jesszhan0024@gmail.com>,
Marijn Suijten <marijn.suijten@somainline.org>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>
Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org,
Paul Sajna <sajattack@postmarketos.org>
Subject: Re: [PATCH v2 1/3] drm/msm/a5xx: Reset the GPU when resuming it
Date: Tue, 20 Oct 2026 08:19:14 +0200 [thread overview]
Message-ID: <3dd32c54-eb1a-410f-8c42-9152e87ecb2c@oss.qualcomm.com> (raw)
In-Reply-To: <20261019-a5xx-gpu-pm-v2-1-457aafbb28da@gmail.com>
On 10/20/26 4:05 AM, Fabricio Akio via B4 Relay wrote:
> From: Fabricio Akio <fabricioakio@gmail.com>
>
> On SDM630, SDM660 and MSM8998 the GPU's GX power domain belongs to its
> SMMU, not to the GPU, so GX switches off only once the SMMU suspends as
> well.
This is because the DT part is a huge slop (artisinal free-range
grass-fed slop from before AI times which I partook in.. sorry!).
The ultimate fix would be to land:
https://lore.kernel.org/linux-arm-msm/20261014-topic-qc_clk_dvfs-v1-0-3041b788e9f7@oss.qualcomm.com/
on other SoCs we scrape by with overzealously assigning various
power domains, as all of the power requirements are managed by
RPM and other pieces of firmware. On msm8996/msm8998/sdm630/660,
that requires a long chain of HLOS-programmed values:
- VDDCX/MX from RPM
- GFX_LDO
- MEM_ACC-GFX
- CPR3/H-GFX
- GPMU on the bigger SoCs
I believe Dmitry is working on getting most of that in order and
should have something to show in the near future.
Konrad
next prev parent reply other threads:[~2026-10-20 6:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 2:05 [PATCH v2 0/3] drm/msm/a5xx: Fix GPU stalls on A508, A509 and A512 Fabricio Akio via B4 Relay
2026-10-20 2:05 ` [PATCH v2 1/3] drm/msm/a5xx: Reset the GPU when resuming it Fabricio Akio via B4 Relay
2026-10-20 6:19 ` Konrad Dybcio [this message]
2026-10-20 2:05 ` [PATCH v2 2/3] drm/msm/a5xx: Hold a CPU latency request while the GPU is powered Fabricio Akio via B4 Relay
2026-10-20 2:05 ` [PATCH v2 3/3] drm/msm/a5xx: Use the downstream GPU idle timeout on A508, A509 and A512 Fabricio Akio via B4 Relay
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