| Reviewer | None |
|---|---|
| Submitted | May 19, 2021, 6:35 p.m. |
| Last Updated | June 1, 2021, 4:11 p.m. |
| Revision | 2 |
| Root msg-id(s): |
20210519183855.1523927-1-robdclark@gmail.com 20210519183855.1523927-1-robdclark@gmail.com |
From: Rob Clark <robdclark@chromium.org>
In some cases, like double-buffered rendering, missing vblanks can
trick the GPU into running at a lower frequence, when really we
want to be running at a higher frequency to not miss the vblanks
in the first place.
This is partially inspired by a trick i915 does, but implemented
via dma-fence for a couple of reasons:
1) To continue to be able to use the atomic helpers
2) To support cases where display and gpu are different drivers
The last patch is just proof of concept, in reality I think it
may want to be a bit more clever. But sending this out as it
is as an RFC to get feedback.
Rob Clark (3):
dma-fence: Add boost fence op
drm/atomic: Call dma_fence_boost() when we've missed a vblank
drm/msm: Wire up gpu boost
drivers/gpu/drm/drm_atomic_helper.c | 11 +++++++++++
drivers/gpu/drm/msm/msm_fence.c | 10 ++++++++++
drivers/gpu/drm/msm/msm_gpu.c | 13 +++++++++++++
drivers/gpu/drm/msm/msm_gpu.h | 2 ++
include/linux/dma-fence.h | 26 ++++++++++++++++++++++++++
5 files changed, 62 insertions(+)
| # | Name | Submitter | State | TC | A | F | R | T |
|---|---|---|---|---|---|---|---|---|
| [RFC,1/3] dma-fence: Add boost fence op | Rob Clark | Not Applicable | 11 | |||||
| [RFC,2/3] drm/atomic: Call dma_fence_boost() when we've missed a vblank | Rob Clark | Superseded | 4 | |||||
| [RFC,3/3] drm/msm: Wire up gpu boost | Rob Clark | Accepted | 0 | |||||
| # | Name | Submitter | State | TC | A | F | R | T |
|---|---|---|---|---|---|---|---|---|
| [RFC,1/3] dma-fence: Add boost fence op | Rob Clark | Not Applicable | 11 | |||||
| [RFC,2/3] drm/atomic: Call dma_fence_boost() when we've missed a vblank | Daniel Vetter | Not Applicable | 0 | |||||
| [RFC,3/3] drm/msm: Wire up gpu boost | Rob Clark | Accepted | 0 | |||||
From: Rob Clark <robdclark@chromium.org> In some cases, like double-buffered rendering, missing vblanks can trick the GPU into running at a lower frequence, when really we want to be running at a higher frequency to not miss the vblanks in the first place. This is partially inspired by a trick i915 does, but implemented via dma-fence for a couple of reasons: 1) To continue to be able to use the atomic helpers 2) To support cases where display and gpu are different drivers The last patch is just proof of concept, in reality I think it may want to be a bit more clever. But sending this out as it is as an RFC to get feedback. Rob Clark (3): dma-fence: Add boost fence op drm/atomic: Call dma_fence_boost() when we've missed a vblank drm/msm: Wire up gpu boost drivers/gpu/drm/drm_atomic_helper.c | 11 +++++++++++ drivers/gpu/drm/msm/msm_fence.c | 10 ++++++++++ drivers/gpu/drm/msm/msm_gpu.c | 13 +++++++++++++ drivers/gpu/drm/msm/msm_gpu.h | 2 ++ include/linux/dma-fence.h | 26 ++++++++++++++++++++++++++ 5 files changed, 62 insertions(+)