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Diffstat (limited to 'drivers/gpu/drm/drm_atomic.c')
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 3d9ae057a6cd..9bdd67781917 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1496,6 +1496,14 @@ EXPORT_SYMBOL(drm_atomic_set_fb_for_plane); * Otherwise, if &drm_plane_state.fence is not set this function we just set it * with the received implicit fence. In both cases this function consumes a * reference for @fence. + * + * This way explicit fencing can be used to overrule implicit fencing, which is + * important to make explicit fencing use-cases work: One example is using one + * buffer for 2 screens with different refresh rates. Implicit fencing will + * clamp rendering to the refresh rate of the slower screen, whereas explicit + * fence allows 2 independent render and display loops on a single buffer. If a + * driver allows obeys both implicit and explicit fences for plane updates, then + * it will break all the benefits of explicit fencing. */ void drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state, |