lkml.org 
[lkml]   [2022]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/2] drm/msm/gpu: System suspend fixes
Date
From: Rob Clark <robdclark@chromium.org>

Because system suspend uses pm_runtime_force_suspend() we can't rely
runpm refcnt's to protect us if the GPU is active, etc. Fortunately
*usually* the GPU is idle when system suspend is triggered. But that
isn't quite good enough.

The first patch attempts to block for a modest amount of time until GPU
is idle (and failing that, returns -EBUSY). We could have taken a
slightly easier approach and just returned -EBUSY if GPU is not idle,
but that would cause system suspend to fail. And no one likes pulling
a hot laptop out of their backpack.

The second patch avoids getting devfreq callbacks after suspend, since
pm_runtime_force_suspend() breaks the pm_runtime_get_if_in_use() tricks
used to deal with devfreq callbacks while suspended.

Rob Clark (2):
drm/msm/gpu: Wait for idle before suspending
drm/msm/gpu: Cancel idle/boost work on suspend

drivers/gpu/drm/msm/adreno/adreno_device.c | 18 ++++++++++++++++++
drivers/gpu/drm/msm/msm_gpu.c | 3 +++
drivers/gpu/drm/msm/msm_gpu.h | 3 +++
drivers/gpu/drm/msm/msm_gpu_devfreq.c | 21 +++++++++++++++++++--
4 files changed, 43 insertions(+), 2 deletions(-)

--
2.33.1

\
 
 \ /
  Last update: 2022-01-08 18:43    [W:0.048 / U:0.780 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site