From: Rob Clark robdclark@chromium.org
This is the outcome of trying to fix some bad gpu freq behavior seen in some use-cases, in particular mobile games that throttle themselves to 30fps. With the existing tuning, we'd end up spending most of the time that we should be running fast at a low freq, and most of the idle time at a high freq.
First two patches are prep, 3/3 is the interesting bit. See the patch description in 3/3 for more details.
v2: struct_mutex serializes the submit path, but not the retire path, so add a dedicated lock to serialize active<->idle transitions.
Rob Clark (3): drm/msm: Split out devfreq handling drm/msm: Split out get_freq() helper drm/msm: Devfreq tuning
drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 +- drivers/gpu/drm/msm/msm_gpu.c | 132 +++-------------- drivers/gpu/drm/msm/msm_gpu.h | 61 +++++++- drivers/gpu/drm/msm/msm_gpu_devfreq.c | 203 ++++++++++++++++++++++++++ 5 files changed, 280 insertions(+), 121 deletions(-) create mode 100644 drivers/gpu/drm/msm/msm_gpu_devfreq.c