drm_atomic_set_fence_for_plane() contains the main discussion from a
driver pov, link to that from more places.
Cc: Pekka Paalanen <pekka.paala...@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Maxime Ripard <maxime.rip...@bootlin.com>
Cc: Sean Paul <s...@poorly.run>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
---
drivers/gpu/drm/drm_gem_framebuffer_helper.c | 6 ++++++
include/drm/drm_plane.h | 2 +-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_gem_framebuffer_helper.c
b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
index 6fd48efe288c..6791245963c3 100644
--- a/drivers/gpu/drm/drm_gem_framebuffer_helper.c
+++ b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
@@ -284,6 +284,9 @@ EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
* There is no need for &drm_plane_helper_funcs.cleanup_fb hook for simple
* gem based framebuffer drivers which have their buffers always pinned in
* memory.
+ *
+ * See drm_atomic_set_fence_for_plane() for a discussion of implicit and
+ * explicit fencing in atomic modeset updates.
*/
int drm_gem_fb_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state)
@@ -314,6 +317,9 @@ EXPORT_SYMBOL_GPL(drm_gem_fb_prepare_fb);
* &dma_buf attached, extracts the exclusive fence and attaches it to plane
* state for the atomic helper to wait on. Drivers can use this as their
* &drm_simple_display_pipe_funcs.prepare_fb callback.
+ *
+ * See drm_atomic_set_fence_for_plane() for a discussion of implicit and
+ * explicit fencing in atomic modeset updates.
*/
int drm_gem_fb_simple_display_pipe_prepare_fb(struct drm_simple_display_pipe
*pipe,
struct drm_plane_state
*plane_state)
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 6078c700d9ba..cd5903ad33f7 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -69,7 +69,7 @@ struct drm_plane_state {
*
* Optional fence to wait for before scanning out @fb. The core atomic
* code will set this when userspace is using explicit fencing. Do not
- * write this directly for a driver's implicit fence, use
+ * write this field directly for a driver's implicit fence, use
* drm_atomic_set_fence_for_plane() to ensure that an explicit fence is
* preserved.
*
--
2.20.1
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