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Date: Tue, 14 Jul 2020 10:10:36 -0700 From: Matthias Kaehlcke <mka@...omium.org> To: Akhil P Oommen <akhilpo@...eaurora.org> Cc: freedreno@...ts.freedesktop.org, dri-devel@...edesktop.org, linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, jcrouse@...eaurora.org, devicetree@...r.kernel.org, jonathan@...ek.ca, robdclark@...il.com, rnayak@...eaurora.org Subject: Re: [PATCH] drm: msm: a6xx: fix gpu failure after system resume On Tue, Jul 14, 2020 at 06:55:30PM +0530, Akhil P Oommen wrote: > On targets where GMU is available, GMU takes over the ownership of GX GDSC > during its initialization. So, take a refcount on the GX PD on behalf of > GMU before we initialize it. This makes sure that nobody can collapse the > GX GDSC once GMU owns the GX GDSC. This patch fixes some weird failures > during GPU wake up during system resume. > > Signed-off-by: Akhil P Oommen <akhilpo@...eaurora.org> I went through a few dozen suspend/resume cycles on SC7180 and didn't run into the kernel panic that typically occurs after a few iterations without this patch. Reported-by: Matthias Kaehlcke <mka@...omium.org> Tested-by: Matthias Kaehlcke <mka@...omium.org> On which tree is this patch based on? I had to apply it manually because 'git am' is unhappy when I try to apply it: error: sha1 information is lacking or useless (drivers/gpu/drm/msm/adreno/a6xx_gmu.c). error: could not build fake ancestor Both upstream and drm-msm are in my remotes and synced, so I suspect it's some private tree. Please make sure to base patches on the corresponding maintainer tree or upstream, whichs makes life easier for maintainers, testers and reviewers.
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