As commented in drm_atomic_helper_wait_for_vblanks(), userspace relies on cursor ioctls being unsynced. Converting the rockchip driver to atomic has significantly impacted cursor performance by making every cursor update wait for vblank.
By skipping the vblank sync when the framebuffer has not changed (as is done in drm_atomic_helper_wait_for_vblanks()) we can avoid this for the common case of moving the cursor and only need to delay the cursor ioctl when the cursor icon changes.
I originally inserted a check on legacy_cursor_update as well, but that caused a storm of iommu page faults. I didn't investigate the cause of those since this change gives enough of a performance improvement for my use case.
This is RFC because of that and because the framebuffer_changed() function is copied from drm_atomic_helper.c as a quick way to test the result.
Signed-off-by: John Keeping john@metanate.com --- drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c index f784488..8fd9821 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c @@ -177,8 +177,28 @@ static void rockchip_crtc_wait_for_update(struct drm_crtc *crtc) crtc_funcs->wait_for_update(crtc); }
+static bool framebuffer_changed(struct drm_device *dev, + struct drm_atomic_state *old_state, + struct drm_crtc *crtc) +{ + struct drm_plane *plane; + struct drm_plane_state *old_plane_state; + int i; + + for_each_plane_in_state(old_state, plane, old_plane_state, i) { + if (plane->state->crtc != crtc && + old_plane_state->crtc != crtc) + continue; + + if (plane->state->fb != old_plane_state->fb) + return true; + } + + return false; +} + static void -rockchip_atomic_wait_for_complete(struct drm_atomic_state *old_state) +rockchip_atomic_wait_for_complete(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_crtc_state *old_crtc_state; struct drm_crtc *crtc; @@ -194,6 +214,9 @@ rockchip_atomic_wait_for_complete(struct drm_atomic_state *old_state) if (!crtc->state->active) continue;
+ if (!framebuffer_changed(dev, old_state, crtc)) + continue; + ret = drm_crtc_vblank_get(crtc); if (ret != 0) continue; @@ -241,7 +264,7 @@ rockchip_atomic_commit_complete(struct rockchip_atomic_commit *commit)
drm_atomic_helper_commit_planes(dev, state, true);
- rockchip_atomic_wait_for_complete(state); + rockchip_atomic_wait_for_complete(dev, state);
drm_atomic_helper_cleanup_planes(dev, state);